Merge pull request #3 from garretfick/merge-curtacircuitos

Merge curtacircuitos

58 files changed, 4253 insertions, 3529 deletions

diff --git a/gerber/tests/golden/example_am_exposure_modifier.png b/gerber/tests/golden/example_am_exposure_modifier.png
new file mode 100644
index 0000000..dac951f
--- /dev/null
+++ b/gerber/tests/golden/example_am_exposure_modifier.png
diff --git a/gerber/tests/golden/example_coincident_hole.png b/gerber/tests/golden/example_coincident_hole.png
new file mode 100644
index 0000000..9855b11
--- /dev/null
+++ b/gerber/tests/golden/example_coincident_hole.png
diff --git a/gerber/tests/golden/example_cutin_multiple.png b/gerber/tests/golden/example_cutin_multiple.png
new file mode 100644
index 0000000..ebc1191
--- /dev/null
+++ b/gerber/tests/golden/example_cutin_multiple.png
diff --git a/gerber/tests/golden/example_flash_circle.png b/gerber/tests/golden/example_flash_circle.png
new file mode 100644
index 0000000..0c407f6
--- /dev/null
+++ b/gerber/tests/golden/example_flash_circle.png
diff --git a/gerber/tests/golden/example_flash_obround.png b/gerber/tests/golden/example_flash_obround.png
new file mode 100644
index 0000000..2fd4dc3
--- /dev/null
+++ b/gerber/tests/golden/example_flash_obround.png
diff --git a/gerber/tests/golden/example_flash_polygon.png b/gerber/tests/golden/example_flash_polygon.png
new file mode 100644
index 0000000..89a964b
--- /dev/null
+++ b/gerber/tests/golden/example_flash_polygon.png
diff --git a/gerber/tests/golden/example_flash_rectangle.png b/gerber/tests/golden/example_flash_rectangle.png
new file mode 100644
index 0000000..797e0c3
--- /dev/null
+++ b/gerber/tests/golden/example_flash_rectangle.png
diff --git a/gerber/tests/golden/example_fully_coincident.png b/gerber/tests/golden/example_fully_coincident.png
new file mode 100644
index 0000000..4e522ff
--- /dev/null
+++ b/gerber/tests/golden/example_fully_coincident.png
diff --git a/gerber/tests/golden/example_holes_dont_clear.png b/gerber/tests/golden/example_holes_dont_clear.png
new file mode 100644
index 0000000..7efb67b
--- /dev/null
+++ b/gerber/tests/golden/example_holes_dont_clear.png
diff --git a/gerber/tests/golden/example_not_overlapping_contour.png b/gerber/tests/golden/example_not_overlapping_contour.png
new file mode 100644
index 0000000..4e522ff
--- /dev/null
+++ b/gerber/tests/golden/example_not_overlapping_contour.png
diff --git a/gerber/tests/golden/example_not_overlapping_touching.png b/gerber/tests/golden/example_not_overlapping_touching.png
new file mode 100644
index 0000000..d485495
--- /dev/null
+++ b/gerber/tests/golden/example_not_overlapping_touching.png
diff --git a/gerber/tests/golden/example_overlapping_contour.png b/gerber/tests/golden/example_overlapping_contour.png
new file mode 100644
index 0000000..7504311
--- /dev/null
+++ b/gerber/tests/golden/example_overlapping_contour.png
diff --git a/gerber/tests/golden/example_overlapping_touching.png b/gerber/tests/golden/example_overlapping_touching.png
new file mode 100644
index 0000000..7504311
--- /dev/null
+++ b/gerber/tests/golden/example_overlapping_touching.png
diff --git a/gerber/tests/golden/example_simple_contour.png b/gerber/tests/golden/example_simple_contour.png
new file mode 100644
index 0000000..564ae14
--- /dev/null
+++ b/gerber/tests/golden/example_simple_contour.png
diff --git a/gerber/tests/golden/example_single_contour.png b/gerber/tests/golden/example_single_contour.png
new file mode 100644
index 0000000..3341638
--- /dev/null
+++ b/gerber/tests/golden/example_single_contour.png
diff --git a/gerber/tests/golden/example_single_contour_3.png b/gerber/tests/golden/example_single_contour_3.png
new file mode 100644
index 0000000..1eecfee
--- /dev/null
+++ b/gerber/tests/golden/example_single_contour_3.png
diff --git a/gerber/tests/golden/example_single_quadrant.gbr b/gerber/tests/golden/example_single_quadrant.gbr
new file mode 100644
index 0000000..b0a3166
--- /dev/null
+++ b/gerber/tests/golden/example_single_quadrant.gbr
@@ -0,0 +1,16 @@
+%FSLAX23Y23*%
+%MOIN*%
+%ADD10C,0.01*%
+G74*
+D10*
+%LPD*%
+G01X1100Y600D02*
+G03X700Y1000I-400J0D01*
+G03X300Y600I0J-400D01*
+G03X700Y200I400J0D01*
+G03X1100Y600I0J400D01*
+G01X300D02*
+X1100D01*
+X700Y200D02*
+Y1000D01*
+M02*
diff --git a/gerber/tests/golden/example_single_quadrant.png b/gerber/tests/golden/example_single_quadrant.png
new file mode 100644
index 0000000..89b763f
--- /dev/null
+++ b/gerber/tests/golden/example_single_quadrant.png
diff --git a/gerber/tests/golden/example_two_square_boxes.gbr b/gerber/tests/golden/example_two_square_boxes.gbr
new file mode 100644
index 0000000..b5c60d1
--- /dev/null
+++ b/gerber/tests/golden/example_two_square_boxes.gbr
@@ -0,0 +1,16 @@
+%FSLAX25Y25*%
+%MOMM*%
+%ADD10C,0.01*%
+D10*
+%LPD*%
+G01X0Y0D02*
+X500000D01*
+Y500000D01*
+X0D01*
+Y0D01*
+X600000D02*
+X1100000D01*
+Y500000D01*
+X600000D01*
+Y0D01*
+M02*
diff --git a/gerber/tests/golden/example_two_square_boxes.png b/gerber/tests/golden/example_two_square_boxes.png
new file mode 100644
index 0000000..98d0518
--- /dev/null
+++ b/gerber/tests/golden/example_two_square_boxes.png
diff --git a/gerber/tests/resources/example_am_exposure_modifier.gbr b/gerber/tests/resources/example_am_exposure_modifier.gbr
new file mode 100644
index 0000000..5f3f3dd
--- /dev/null
+++ b/gerber/tests/resources/example_am_exposure_modifier.gbr
@@ -0,0 +1,16 @@
+G04 Umaco example for exposure modifier and clearing area*
+%FSLAX26Y26*%
+%MOIN*%
+%AMSQUAREWITHHOLE*
+21,0.1,1,1,0,0,0*
+1,0,0.5,0,0*%
+%ADD10SQUAREWITHHOLE*%
+%ADD11C,1*%
+G01*
+%LPD*%
+D11*
+X-1000000Y-250000D02*
+X1000000Y250000D01*
+D10*
+X0Y0D03*
+M02*
\ No newline at end of file
diff --git a/gerber/tests/resources/example_coincident_hole.gbr b/gerber/tests/resources/example_coincident_hole.gbr
new file mode 100644
index 0000000..4f896ea
--- /dev/null
+++ b/gerber/tests/resources/example_coincident_hole.gbr
@@ -0,0 +1,24 @@
+G04 ex2: overlapping*
+%FSLAX24Y24*%
+%MOMM*%
+%SRX1Y1I0.000J0.000*%
+%ADD10C,1.00000*%
+G01*
+%LPD*%
+G36*
+X0Y50000D02*
+Y100000D01*
+X100000D01*
+Y0D01*
+X0D01*
+Y50000D01*
+G04 first fully coincident linear segment*
+X10000D01*
+X50000Y10000D01*
+X90000Y50000D01*
+X50000Y90000D01*
+X10000Y50000D01*
+G04 second fully coincident linear segment*
+X0D01*
+G37*
+M02*
\ No newline at end of file
diff --git a/gerber/tests/resources/example_cutin.gbr b/gerber/tests/resources/example_cutin.gbr
new file mode 100644
index 0000000..365e5e1
--- /dev/null
+++ b/gerber/tests/resources/example_cutin.gbr
@@ -0,0 +1,18 @@
+G04 Umaco uut-in example*
+%FSLAX24Y24*%
+G75*
+G36*
+X20000Y100000D02*
+G01*
+X120000D01*
+Y20000D01*
+X20000D01*
+Y60000D01*
+X50000D01*
+G03*
+X50000Y60000I30000J0D01*
+G01*
+X20000D01*
+Y100000D01*
+G37*
+M02*
\ No newline at end of file
diff --git a/gerber/tests/resources/example_cutin_multiple.gbr b/gerber/tests/resources/example_cutin_multiple.gbr
new file mode 100644
index 0000000..8e19429
--- /dev/null
+++ b/gerber/tests/resources/example_cutin_multiple.gbr
@@ -0,0 +1,28 @@
+G04 multiple cutins*
+%FSLAX24Y24*%
+%MOMM*%
+%SRX1Y1I0.000J0.000*%
+%ADD10C,1.00000*%
+%LPD*%
+G36*
+X1220000Y2570000D02*
+G01*
+Y2720000D01*
+X1310000D01*
+Y2570000D01*
+X1250000D01*
+Y2600000D01*
+X1290000D01*
+Y2640000D01*
+X1250000D01*
+Y2670000D01*
+X1290000D01*
+Y2700000D01*
+X1250000D01*
+Y2670000D01*
+Y2640000D01*
+Y2600000D01*
+Y2570000D01*
+X1220000D01*
+G37*
+M02*
\ No newline at end of file
diff --git a/gerber/tests/resources/example_flash_circle.gbr b/gerber/tests/resources/example_flash_circle.gbr
new file mode 100644
index 0000000..20b2566
--- /dev/null
+++ b/gerber/tests/resources/example_flash_circle.gbr
@@ -0,0 +1,10 @@
+G04 Flashes of circular apertures*
+%FSLAX24Y24*%
+%MOMM*%
+%ADD10C,0.5*%
+%ADD11C,0.5X0.25*%
+D10*
+X000000Y000000D03*
+D11*
+X010000D03*
+M02*
\ No newline at end of file
diff --git a/gerber/tests/resources/example_flash_obround.gbr b/gerber/tests/resources/example_flash_obround.gbr
new file mode 100644
index 0000000..5313f82
--- /dev/null
+++ b/gerber/tests/resources/example_flash_obround.gbr
@@ -0,0 +1,10 @@
+G04 Flashes of rectangular apertures*
+%FSLAX24Y24*%
+%MOMM*%
+%ADD10O,0.46X0.26*%
+%ADD11O,0.46X0.26X0.19*%
+D10*
+X000000Y000000D03*
+D11*
+X010000D03*
+M02*
\ No newline at end of file
diff --git a/gerber/tests/resources/example_flash_polygon.gbr b/gerber/tests/resources/example_flash_polygon.gbr
new file mode 100644
index 0000000..177cf9b
--- /dev/null
+++ b/gerber/tests/resources/example_flash_polygon.gbr
@@ -0,0 +1,10 @@
+G04 Flashes of rectangular apertures*
+%FSLAX24Y24*%
+%MOMM*%
+%ADD10P,.40X6*%
+%ADD11P,.40X6X0.0X0.19*%
+D10*
+X000000Y000000D03*
+D11*
+X010000D03*
+M02*
\ No newline at end of file
diff --git a/gerber/tests/resources/example_flash_rectangle.gbr b/gerber/tests/resources/example_flash_rectangle.gbr
new file mode 100644
index 0000000..8fde812
--- /dev/null
+++ b/gerber/tests/resources/example_flash_rectangle.gbr
@@ -0,0 +1,10 @@
+G04 Flashes of rectangular apertures*
+%FSLAX24Y24*%
+%MOMM*%
+%ADD10R,0.44X0.25*%
+%ADD11R,0.44X0.25X0.19*%
+D10*
+X000000Y000000D03*
+D11*
+X010000D03*
+M02*
\ No newline at end of file
diff --git a/gerber/tests/resources/example_fully_coincident.gbr b/gerber/tests/resources/example_fully_coincident.gbr
new file mode 100644
index 0000000..3764128
--- /dev/null
+++ b/gerber/tests/resources/example_fully_coincident.gbr
@@ -0,0 +1,23 @@
+G04 ex1: non overlapping*
+%FSLAX24Y24*%
+%MOMM*%
+%ADD10C,1.00000*%
+G01*
+%LPD*%
+G36*
+X0Y50000D02*
+Y100000D01*
+X100000D01*
+Y0D01*
+X0D01*
+Y50000D01*
+G04 first fully coincident linear segment*
+X-10000D01*
+X-50000Y10000D01*
+X-90000Y50000D01*
+X-50000Y90000D01*
+X-10000Y50000D01*
+G04 second fully coincident linear segment*
+X0D01*
+G37*
+M02*
\ No newline at end of file
diff --git a/gerber/tests/resources/example_holes_dont_clear.gbr b/gerber/tests/resources/example_holes_dont_clear.gbr
new file mode 100644
index 0000000..deeebd0
--- /dev/null
+++ b/gerber/tests/resources/example_holes_dont_clear.gbr
@@ -0,0 +1,13 @@
+G04 Demonstrates that apertures with holes do not clear the area - only the aperture hole*
+%FSLAX26Y26*%
+%MOIN*%
+%ADD10C,1X0.5*%
+%ADD11C,0.1*%
+G01*
+%LPD*%
+D11*
+X-1000000Y-250000D02*
+X1000000Y250000D01*
+D10*
+X0Y0D03*
+M02*
\ No newline at end of file
diff --git a/gerber/tests/resources/example_level_holes.gbr b/gerber/tests/resources/example_level_holes.gbr
new file mode 100644
index 0000000..1b4e189
--- /dev/null
+++ b/gerber/tests/resources/example_level_holes.gbr
@@ -0,0 +1,39 @@
+G04 This file illustrates how to use levels to create holes*
+%FSLAX25Y25*%
+%MOMM*%
+G01*
+G04 First level: big square - dark polarity*
+%LPD*%
+G36*
+X250000Y250000D02*
+X1750000D01*
+Y1750000D01*
+X250000D01*
+Y250000D01*
+G37*
+G04 Second level: big circle - clear polarity*
+%LPC*%
+G36*
+G75*
+X500000Y1000000D02*
+G03*
+X500000Y1000000I500000J0D01*
+G37*
+G04 Third level: small square - dark polarity*
+%LPD*%
+G36*
+X750000Y750000D02*
+X1250000D01*
+Y1250000D01*
+X750000D01*
+Y750000D01*
+G37*
+G04 Fourth level: small circle - clear polarity*
+%LPC*%
+G36*
+G75*
+X1150000Y1000000D02*
+G03*
+X1150000Y1000000I250000J0D01*
+G37*
+M02*
\ No newline at end of file
diff --git a/gerber/tests/resources/example_not_overlapping_contour.gbr b/gerber/tests/resources/example_not_overlapping_contour.gbr
new file mode 100644
index 0000000..e3ea631
--- /dev/null
+++ b/gerber/tests/resources/example_not_overlapping_contour.gbr
@@ -0,0 +1,20 @@
+G04 Non-overlapping contours*
+%FSLAX24Y24*%
+%MOMM*%
+%ADD10C,1.00000*%
+G01*
+%LPD*%
+G36*
+X0Y50000D02*
+Y100000D01*
+X100000D01*
+Y0D01*
+X0D01*
+Y50000D01*
+X-10000D02*
+X-50000Y10000D01*
+X-90000Y50000D01*
+X-50000Y90000D01*
+X-10000Y50000D01*
+G37*
+M02*
\ No newline at end of file
diff --git a/gerber/tests/resources/example_not_overlapping_touching.gbr b/gerber/tests/resources/example_not_overlapping_touching.gbr
new file mode 100644
index 0000000..3b9b955
--- /dev/null
+++ b/gerber/tests/resources/example_not_overlapping_touching.gbr
@@ -0,0 +1,20 @@
+G04 Non-overlapping and touching*
+%FSLAX24Y24*%
+%MOMM*%
+%ADD10C,1.00000*%
+G01*
+%LPD*%
+G36*
+X0Y50000D02*
+Y100000D01*
+X100000D01*
+Y0D01*
+X0D01*
+Y50000D01*
+D02*
+X-50000Y10000D01*
+X-90000Y50000D01*
+X-50000Y90000D01*
+X0Y50000D01*
+G37*
+M02*
\ No newline at end of file
diff --git a/gerber/tests/resources/example_overlapping_contour.gbr b/gerber/tests/resources/example_overlapping_contour.gbr
new file mode 100644
index 0000000..74886a2
--- /dev/null
+++ b/gerber/tests/resources/example_overlapping_contour.gbr
@@ -0,0 +1,20 @@
+G04 Overlapping contours*
+%FSLAX24Y24*%
+%MOMM*%
+%ADD10C,1.00000*%
+G01*
+%LPD*%
+G36*
+X0Y50000D02*
+Y100000D01*
+X100000D01*
+Y0D01*
+X0D01*
+Y50000D01*
+X10000D02*
+X50000Y10000D01*
+X90000Y50000D01*
+X50000Y90000D01*
+X10000Y50000D01*
+G37*
+M02*
\ No newline at end of file
diff --git a/gerber/tests/resources/example_overlapping_touching.gbr b/gerber/tests/resources/example_overlapping_touching.gbr
new file mode 100644
index 0000000..27fce15
--- /dev/null
+++ b/gerber/tests/resources/example_overlapping_touching.gbr
@@ -0,0 +1,20 @@
+G04 Overlapping and touching*
+%FSLAX24Y24*%
+%MOMM*%
+%ADD10C,1.00000*%
+G01*
+%LPD*%
+G36*
+X0Y50000D02*
+Y100000D01*
+X100000D01*
+Y0D01*
+X0D01*
+Y50000D01*
+D02*
+X50000Y10000D01*
+X90000Y50000D01*
+X50000Y90000D01*
+X0Y50000D01*
+G37*
+M02*
\ No newline at end of file
diff --git a/gerber/tests/resources/example_simple_contour.gbr b/gerber/tests/resources/example_simple_contour.gbr
new file mode 100644
index 0000000..d851760
--- /dev/null
+++ b/gerber/tests/resources/example_simple_contour.gbr
@@ -0,0 +1,16 @@
+G04 Ucamco ex. 4.6.4: Simple contour*
+%FSLAX25Y25*%
+%MOIN*%
+%ADD10C,0.010*%
+G36*
+X200000Y300000D02*
+G01*
+X700000D01*
+Y100000D01*
+X1100000Y500000D01*
+X700000Y900000D01*
+Y700000D01*
+X200000D01*
+Y300000D01*
+G37*
+M02*
\ No newline at end of file
diff --git a/gerber/tests/resources/example_single_contour_1.gbr b/gerber/tests/resources/example_single_contour_1.gbr
new file mode 100644
index 0000000..e9f9a75
--- /dev/null
+++ b/gerber/tests/resources/example_single_contour_1.gbr
@@ -0,0 +1,15 @@
+G04 Ucamco ex. 4.6.5: Single contour #1*
+%FSLAX25Y25*%
+%MOMM*%
+%ADD11C,0.01*%
+G01*
+D11*
+X3000Y5000D01*
+G36*
+X50000Y50000D02*
+X60000D01*
+Y60000D01*
+X50000D01*
+Y50000Y50000D01*
+G37*
+M02*
\ No newline at end of file
diff --git a/gerber/tests/resources/example_single_contour_2.gbr b/gerber/tests/resources/example_single_contour_2.gbr
new file mode 100644
index 0000000..085c72c
--- /dev/null
+++ b/gerber/tests/resources/example_single_contour_2.gbr
@@ -0,0 +1,15 @@
+G04 Ucamco ex. 4.6.5: Single contour #2*
+%FSLAX25Y25*%
+%MOMM*%
+%ADD11C,0.01*%
+G01*
+D11*
+X3000Y5000D01*
+X50000Y50000D02*
+G36*
+X60000D01*
+Y60000D01*
+X50000D01*
+Y50000Y50000D01*
+G37*
+M02*
\ No newline at end of file
diff --git a/gerber/tests/resources/example_single_contour_3.gbr b/gerber/tests/resources/example_single_contour_3.gbr
new file mode 100644
index 0000000..40de149
--- /dev/null
+++ b/gerber/tests/resources/example_single_contour_3.gbr
@@ -0,0 +1,15 @@
+G04 Ucamco ex. 4.6.5: Single contour #2*
+%FSLAX25Y25*%
+%MOMM*%
+%ADD11C,0.01*%
+G01*
+D11*
+X3000Y5000D01*
+X50000Y50000D01*
+G36*
+X60000D01*
+Y60000D01*
+X50000D01*
+Y50000Y50000D01*
+G37*
+M02*
\ No newline at end of file
diff --git a/gerber/tests/resources/example_single_quadrant.gbr b/gerber/tests/resources/example_single_quadrant.gbr
new file mode 100644
index 0000000..c398601
--- /dev/null
+++ b/gerber/tests/resources/example_single_quadrant.gbr
@@ -0,0 +1,18 @@
+G04 Ucamco ex. 4.5.8: Single quadrant*
+%FSLAX23Y23*%
+%MOIN*%
+%ADD10C,0.010*%
+G74*
+D10*
+X1100Y600D02*
+G03*
+X700Y1000I400J0D01*
+X300Y600I0J400D01*
+X700Y200I400J0D01*
+X1100Y600I0J400D01*
+X300D02*
+G01*
+X1100D01*
+X700Y200D02*
+Y1000D01*
+M02*
\ No newline at end of file
diff --git a/gerber/tests/resources/example_two_square_boxes.gbr b/gerber/tests/resources/example_two_square_boxes.gbr
new file mode 100644
index 0000000..54a8ac1
--- /dev/null
+++ b/gerber/tests/resources/example_two_square_boxes.gbr
@@ -0,0 +1,19 @@
+G04 Ucamco ex. 1: Two square boxes*
+%FSLAX25Y25*%
+%MOMM*%
+%TF.Part,Other*%
+%LPD*%
+%ADD10C,0.010*%
+D10*
+X0Y0D02*
+G01*
+X500000Y0D01*
+Y500000D01*
+X0D01*
+Y0D01*
+X600000D02*
+X1100000D01*
+Y500000D01*
+X600000D01*
+Y0D01*
+M02*
\ No newline at end of file
diff --git a/gerber/tests/resources/ipc-d-356.ipc b/gerber/tests/resources/ipc-d-356.ipc
new file mode 100644
index 0000000..2ed3f49
--- /dev/null
+++ b/gerber/tests/resources/ipc-d-356.ipc
@@ -0,0 +1,115 @@
+C  IPC-D-356 generated by EAGLE Version 7.1.0 Copyright (c) 1988-2014 CadSoft
+C  Database /Some/Path/To/File
+C
+P  JOB EAGLE 7.1 NETLIST, DATE: 2/20/15 12:00 AM
+P  UNITS CUST 0
+P  DIM N
+P  NNAME1 A_REALLY_LONG_NET_NAME
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+317GND              VIA         D  24PA00X   8950Y   1000X 396Y 396
+317GND              VIA         D  24PA00X  11800Y   2250X 396Y 396
+317GND              VIA         D  24PA00X  15350Y   3200X 396Y 396
+317GND              VIA         D  24PA00X  13200Y   3800X 396Y 396
+317GND              VIA         D  24PA00X   9700Y  12050X 396Y 396
+317GND              VIA         D  24PA00X  13950Y  11900X 396Y 396
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+317GND              VIA         D  24PA00X  13000Y   8400X 396Y 396
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+327N$3              C1    -+          A01X   9700Y  10402X1575Y 630R270
+327GND              C1    --          A01X   9700Y  13198X1575Y 630R270
+327VCC              C2    -+          A01X  13950Y   9677X1535Y 630R270
+327GND              C2    --          A01X  13950Y  13023X1535Y 630R270
+327VCC              C3    -1          A01X   3850Y   9924X 512Y 591R270
+327GND              C3    -2          A01X   3850Y   9176X 512Y 591R270
+327VCC              C4    -1          A01X  10374Y   1000X 512Y 591R180
+327GND              C4    -2          A01X   9626Y   1000X 512Y 591R180
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+327GND              C5    -2          A01X  14700Y   3176X 512Y 591R270
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+317VCC              J1    -2    D  35PA00X  17900Y   6900X 554Y 554R 90
+317GND              J1    -3    D  35PA00X  16900Y   7400X 554Y 554R 90
+317PIC_PGD          J1    -4    D  35PA00X  17900Y   7900X 554Y 554R 90
+317PIC_PGC          J1    -5    D  35PA00X  16900Y   8400X 554Y 554R 90
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+327                 U4    -4          A01X   4704Y    750X 394Y 500R  0
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+327NNAME1           NA    -69         A01X   8396Y   3850X 394Y 500R  0
+389BOARD_EDGE         X0Y0 X22500 Y15000 X0
+089                   X1300Y240
+999
diff --git a/gerber/tests/resources/multiline_read.ger b/gerber/tests/resources/multiline_read.ger
new file mode 100644
index 0000000..02242e4
--- /dev/null
+++ b/gerber/tests/resources/multiline_read.ger
@@ -0,0 +1,9 @@
+G75*
+G71*
+%OFA0B0*%
+%FSLAX23Y23*%
+%IPPOS*%
+%LPD*%
+%ADD10C,0.1*%
+%LPD*%D10*
+M02*
\ No newline at end of file
diff --git a/gerber/tests/resources/top_copper.GTL b/gerber/tests/resources/top_copper.GTL
index cedd2fd..d53f5ec 100644
--- a/gerber/tests/resources/top_copper.GTL
+++ b/gerber/tests/resources/top_copper.GTL
@@ -1,3457 +1 @@
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\ No newline at end of file
diff --git a/gerber/tests/test_am_statements.py b/gerber/tests/test_am_statements.py
new file mode 100644
index 0000000..98a7332
--- /dev/null
+++ b/gerber/tests/test_am_statements.py
@@ -0,0 +1,383 @@
+#! /usr/bin/env python
+# -*- coding: utf-8 -*-
+
+# Author: Hamilton Kibbe <ham@hamiltonkib.be>
+
+from .tests import *
+from ..am_statements import *
+from ..am_statements import inch, metric
+
+
+def test_AMPrimitive_ctor():
+    for exposure in ('on', 'off', 'ON', 'OFF'):
+        for code in (0, 1, 2, 4, 5, 6, 7, 20, 21, 22):
+            p = AMPrimitive(code, exposure)
+            assert_equal(p.code, code)
+            assert_equal(p.exposure, exposure.lower())
+
+
+def test_AMPrimitive_validation():
+    assert_raises(TypeError, AMPrimitive, '1', 'off')
+    assert_raises(ValueError, AMPrimitive, 0, 'exposed')
+    assert_raises(ValueError, AMPrimitive, 3, 'off')
+
+
+def test_AMPrimitive_conversion():
+    p = AMPrimitive(4, 'on')
+    assert_raises(NotImplementedError, p.to_inch)
+    assert_raises(NotImplementedError, p.to_metric)
+
+
+def test_AMCommentPrimitive_ctor():
+    c = AMCommentPrimitive(0, ' This is a comment *')
+    assert_equal(c.code, 0)
+    assert_equal(c.comment, 'This is a comment')
+
+
+def test_AMCommentPrimitive_validation():
+    assert_raises(ValueError, AMCommentPrimitive, 1, 'This is a comment')
+
+
+def test_AMCommentPrimitive_factory():
+    c = AMCommentPrimitive.from_gerber('0 Rectangle with rounded corners. *')
+    assert_equal(c.code, 0)
+    assert_equal(c.comment, 'Rectangle with rounded corners.')
+
+
+def test_AMCommentPrimitive_dump():
+    c = AMCommentPrimitive(0, 'Rectangle with rounded corners.')
+    assert_equal(c.to_gerber(), '0 Rectangle with rounded corners. *')
+
+
+def test_AMCommentPrimitive_conversion():
+    c = AMCommentPrimitive(0, 'Rectangle with rounded corners.')
+    ci = c
+    cm = c
+    ci.to_inch()
+    cm.to_metric()
+    assert_equal(c, ci)
+    assert_equal(c, cm)
+
+
+def test_AMCommentPrimitive_string():
+    c = AMCommentPrimitive(0, 'Test Comment')
+    assert_equal(str(c), '<Aperture Macro Comment: Test Comment>')
+
+
+def test_AMCirclePrimitive_ctor():
+    test_cases = ((1, 'on', 0, (0, 0)),
+                  (1, 'off', 1, (0, 1)),
+                  (1, 'on', 2.5, (0, 2)),
+                  (1, 'off', 5.0, (3, 3)))
+    for code, exposure, diameter, position in test_cases:
+        c = AMCirclePrimitive(code, exposure, diameter, position)
+        assert_equal(c.code, code)
+        assert_equal(c.exposure, exposure)
+        assert_equal(c.diameter, diameter)
+        assert_equal(c.position, position)
+
+
+def test_AMCirclePrimitive_validation():
+    assert_raises(ValueError, AMCirclePrimitive, 2, 'on', 0, (0, 0))
+
+
+def test_AMCirclePrimitive_factory():
+    c = AMCirclePrimitive.from_gerber('1,0,5,0,0*')
+    assert_equal(c.code, 1)
+    assert_equal(c.exposure, 'off')
+    assert_equal(c.diameter, 5)
+    assert_equal(c.position, (0, 0))
+
+
+def test_AMCirclePrimitive_dump():
+    c = AMCirclePrimitive(1, 'off', 5, (0, 0))
+    assert_equal(c.to_gerber(), '1,0,5,0,0*')
+    c = AMCirclePrimitive(1, 'on', 5, (0, 0))
+    assert_equal(c.to_gerber(), '1,1,5,0,0*')
+
+
+def test_AMCirclePrimitive_conversion():
+    c = AMCirclePrimitive(1, 'off', 25.4, (25.4, 0))
+    c.to_inch()
+    assert_equal(c.diameter, 1)
+    assert_equal(c.position, (1, 0))
+
+    c = AMCirclePrimitive(1, 'off', 1, (1, 0))
+    c.to_metric()
+    assert_equal(c.diameter, 25.4)
+    assert_equal(c.position, (25.4, 0))
+
+
+def test_AMVectorLinePrimitive_validation():
+    assert_raises(ValueError, AMVectorLinePrimitive,
+                  3, 'on', 0.1, (0, 0), (3.3, 5.4), 0)
+
+
+def test_AMVectorLinePrimitive_factory():
+    l = AMVectorLinePrimitive.from_gerber('20,1,0.9,0,0.45,12,0.45,0*')
+    assert_equal(l.code, 20)
+    assert_equal(l.exposure, 'on')
+    assert_equal(l.width, 0.9)
+    assert_equal(l.start, (0, 0.45))
+    assert_equal(l.end, (12, 0.45))
+    assert_equal(l.rotation, 0)
+
+
+def test_AMVectorLinePrimitive_dump():
+    l = AMVectorLinePrimitive.from_gerber('20,1,0.9,0,0.45,12,0.45,0*')
+    assert_equal(l.to_gerber(), '20,1,0.9,0.0,0.45,12.0,0.45,0.0*')
+
+
+def test_AMVectorLinePrimtive_conversion():
+    l = AMVectorLinePrimitive(20, 'on', 25.4, (0, 0), (25.4, 25.4), 0)
+    l.to_inch()
+    assert_equal(l.width, 1)
+    assert_equal(l.start, (0, 0))
+    assert_equal(l.end, (1, 1))
+
+    l = AMVectorLinePrimitive(20, 'on', 1, (0, 0), (1, 1), 0)
+    l.to_metric()
+    assert_equal(l.width, 25.4)
+    assert_equal(l.start, (0, 0))
+    assert_equal(l.end, (25.4, 25.4))
+
+
+def test_AMOutlinePrimitive_validation():
+    assert_raises(ValueError, AMOutlinePrimitive, 7, 'on',
+                  (0, 0), [(3.3, 5.4), (4.0, 5.4), (0, 0)], 0)
+    assert_raises(ValueError, AMOutlinePrimitive, 4, 'on',
+                  (0, 0), [(3.3, 5.4), (4.0, 5.4), (0, 1)], 0)
+
+
+def test_AMOutlinePrimitive_factory():
+    o = AMOutlinePrimitive.from_gerber('4,1,3,0,0,3,3,3,0,0,0,0*')
+    assert_equal(o.code, 4)
+    assert_equal(o.exposure, 'on')
+    assert_equal(o.start_point, (0, 0))
+    assert_equal(o.points, [(3, 3), (3, 0), (0, 0)])
+    assert_equal(o.rotation, 0)
+
+
+def test_AMOUtlinePrimitive_dump():
+    o = AMOutlinePrimitive(4, 'on', (0, 0), [(3, 3), (3, 0), (0, 0)], 0)
+    # New lines don't matter for Gerber, but we insert them to make it easier to remove
+    # For test purposes we can ignore them
+    assert_equal(o.to_gerber().replace('\n', ''), '4,1,3,0,0,3,3,3,0,0,0,0*')
+
+
+
+def test_AMOutlinePrimitive_conversion():
+    o = AMOutlinePrimitive(
+        4, 'on', (0, 0), [(25.4, 25.4), (25.4, 0), (0, 0)], 0)
+    o.to_inch()
+    assert_equal(o.start_point, (0, 0))
+    assert_equal(o.points, ((1., 1.), (1., 0.), (0., 0.)))
+
+    o = AMOutlinePrimitive(4, 'on', (0, 0), [(1, 1), (1, 0), (0, 0)], 0)
+    o.to_metric()
+    assert_equal(o.start_point, (0, 0))
+    assert_equal(o.points, ((25.4, 25.4), (25.4, 0), (0, 0)))
+
+
+def test_AMPolygonPrimitive_validation():
+    assert_raises(ValueError, AMPolygonPrimitive, 6, 'on', 3, (3.3, 5.4), 3, 0)
+    assert_raises(ValueError, AMPolygonPrimitive, 5, 'on', 2, (3.3, 5.4), 3, 0)
+    assert_raises(ValueError, AMPolygonPrimitive, 5, 'on', 13, (3.3, 5.4), 3, 0)
+
+
+def test_AMPolygonPrimitive_factory():
+    p = AMPolygonPrimitive.from_gerber('5,1,3,3.3,5.4,3,0')
+    assert_equal(p.code, 5)
+    assert_equal(p.exposure, 'on')
+    assert_equal(p.vertices, 3)
+    assert_equal(p.position, (3.3, 5.4))
+    assert_equal(p.diameter, 3)
+    assert_equal(p.rotation, 0)
+
+
+def test_AMPolygonPrimitive_dump():
+    p = AMPolygonPrimitive(5, 'on', 3, (3.3, 5.4), 3, 0)
+    assert_equal(p.to_gerber(), '5,1,3,3.3,5.4,3,0*')
+
+
+def test_AMPolygonPrimitive_conversion():
+    p = AMPolygonPrimitive(5, 'off', 3, (25.4, 0), 25.4, 0)
+    p.to_inch()
+    assert_equal(p.diameter, 1)
+    assert_equal(p.position, (1, 0))
+
+    p = AMPolygonPrimitive(5, 'off', 3, (1, 0), 1, 0)
+    p.to_metric()
+    assert_equal(p.diameter, 25.4)
+    assert_equal(p.position, (25.4, 0))
+
+
+def test_AMMoirePrimitive_validation():
+    assert_raises(ValueError, AMMoirePrimitive, 7,
+                  (0, 0), 5.1, 0.2, 0.4, 6, 0.1, 6.1, 0)
+
+
+def test_AMMoirePrimitive_factory():
+    m = AMMoirePrimitive.from_gerber('6,0,0,5,0.5,0.5,2,0.1,6,0*')
+    assert_equal(m.code, 6)
+    assert_equal(m.position, (0, 0))
+    assert_equal(m.diameter, 5)
+    assert_equal(m.ring_thickness, 0.5)
+    assert_equal(m.gap, 0.5)
+    assert_equal(m.max_rings, 2)
+    assert_equal(m.crosshair_thickness, 0.1)
+    assert_equal(m.crosshair_length, 6)
+    assert_equal(m.rotation, 0)
+
+
+def test_AMMoirePrimitive_dump():
+    m = AMMoirePrimitive.from_gerber('6,0,0,5,0.5,0.5,2,0.1,6,0*')
+    assert_equal(m.to_gerber(), '6,0,0,5.0,0.5,0.5,2,0.1,6.0,0.0*')
+
+
+def test_AMMoirePrimitive_conversion():
+    m = AMMoirePrimitive(6, (25.4, 25.4), 25.4, 25.4, 25.4, 6, 25.4, 25.4, 0)
+    m.to_inch()
+    assert_equal(m.position, (1., 1.))
+    assert_equal(m.diameter, 1.)
+    assert_equal(m.ring_thickness, 1.)
+    assert_equal(m.gap, 1.)
+    assert_equal(m.crosshair_thickness, 1.)
+    assert_equal(m.crosshair_length, 1.)
+
+    m = AMMoirePrimitive(6, (1, 1), 1, 1, 1, 6, 1, 1, 0)
+    m.to_metric()
+    assert_equal(m.position, (25.4, 25.4))
+    assert_equal(m.diameter, 25.4)
+    assert_equal(m.ring_thickness, 25.4)
+    assert_equal(m.gap, 25.4)
+    assert_equal(m.crosshair_thickness, 25.4)
+    assert_equal(m.crosshair_length, 25.4)
+
+
+def test_AMThermalPrimitive_validation():
+    assert_raises(ValueError, AMThermalPrimitive, 8, (0.0, 0.0), 7, 5, 0.2, 0.0)
+    assert_raises(TypeError, AMThermalPrimitive, 7, (0.0, '0'), 7, 5, 0.2, 0.0)
+
+
+
+def test_AMThermalPrimitive_factory():
+    t = AMThermalPrimitive.from_gerber('7,0,0,7,6,0.2,45*')
+    assert_equal(t.code, 7)
+    assert_equal(t.position, (0, 0))
+    assert_equal(t.outer_diameter, 7)
+    assert_equal(t.inner_diameter, 6)
+    assert_equal(t.gap, 0.2)
+    assert_equal(t.rotation, 45)
+
+
+
+def test_AMThermalPrimitive_dump():
+    t = AMThermalPrimitive.from_gerber('7,0,0,7,6,0.2,30*')
+    assert_equal(t.to_gerber(), '7,0,0,7.0,6.0,0.2,30.0*')
+
+
+
+def test_AMThermalPrimitive_conversion():
+    t = AMThermalPrimitive(7, (25.4, 25.4), 25.4, 25.4, 25.4, 0.0)
+    t.to_inch()
+    assert_equal(t.position, (1., 1.))
+    assert_equal(t.outer_diameter, 1.)
+    assert_equal(t.inner_diameter, 1.)
+    assert_equal(t.gap, 1.)
+
+    t = AMThermalPrimitive(7, (1, 1), 1, 1, 1, 0)
+    t.to_metric()
+    assert_equal(t.position, (25.4, 25.4))
+    assert_equal(t.outer_diameter, 25.4)
+    assert_equal(t.inner_diameter, 25.4)
+    assert_equal(t.gap, 25.4)
+
+
+def test_AMCenterLinePrimitive_validation():
+    assert_raises(ValueError, AMCenterLinePrimitive,
+                  22, 1, 0.2, 0.5, (0, 0), 0)
+
+
+def test_AMCenterLinePrimtive_factory():
+    l = AMCenterLinePrimitive.from_gerber('21,1,6.8,1.2,3.4,0.6,0*')
+    assert_equal(l.code, 21)
+    assert_equal(l.exposure, 'on')
+    assert_equal(l.width, 6.8)
+    assert_equal(l.height, 1.2)
+    assert_equal(l.center, (3.4, 0.6))
+    assert_equal(l.rotation, 0)
+
+
+def test_AMCenterLinePrimitive_dump():
+    l = AMCenterLinePrimitive.from_gerber('21,1,6.8,1.2,3.4,0.6,0*')
+    assert_equal(l.to_gerber(), '21,1,6.8,1.2,3.4,0.6,0.0*')
+
+
+def test_AMCenterLinePrimitive_conversion():
+    l = AMCenterLinePrimitive(21, 'on', 25.4, 25.4, (25.4, 25.4), 0)
+    l.to_inch()
+    assert_equal(l.width, 1.)
+    assert_equal(l.height, 1.)
+    assert_equal(l.center, (1., 1.))
+
+    l = AMCenterLinePrimitive(21, 'on', 1, 1, (1, 1), 0)
+    l.to_metric()
+    assert_equal(l.width, 25.4)
+    assert_equal(l.height, 25.4)
+    assert_equal(l.center, (25.4, 25.4))
+
+
+def test_AMLowerLeftLinePrimitive_validation():
+    assert_raises(ValueError, AMLowerLeftLinePrimitive,
+                  23, 1, 0.2, 0.5, (0, 0), 0)
+
+
+def test_AMLowerLeftLinePrimtive_factory():
+    l = AMLowerLeftLinePrimitive.from_gerber('22,1,6.8,1.2,3.4,0.6,0*')
+    assert_equal(l.code, 22)
+    assert_equal(l.exposure, 'on')
+    assert_equal(l.width, 6.8)
+    assert_equal(l.height, 1.2)
+    assert_equal(l.lower_left, (3.4, 0.6))
+    assert_equal(l.rotation, 0)
+
+
+def test_AMLowerLeftLinePrimitive_dump():
+    l = AMLowerLeftLinePrimitive.from_gerber('22,1,6.8,1.2,3.4,0.6,0*')
+    assert_equal(l.to_gerber(), '22,1,6.8,1.2,3.4,0.6,0.0*')
+
+
+def test_AMLowerLeftLinePrimitive_conversion():
+    l = AMLowerLeftLinePrimitive(22, 'on', 25.4, 25.4, (25.4, 25.4), 0)
+    l.to_inch()
+    assert_equal(l.width, 1.)
+    assert_equal(l.height, 1.)
+    assert_equal(l.lower_left, (1., 1.))
+
+    l = AMLowerLeftLinePrimitive(22, 'on', 1, 1, (1, 1), 0)
+    l.to_metric()
+    assert_equal(l.width, 25.4)
+    assert_equal(l.height, 25.4)
+    assert_equal(l.lower_left, (25.4, 25.4))
+
+
+def test_AMUnsupportPrimitive():
+    u = AMUnsupportPrimitive.from_gerber('Test')
+    assert_equal(u.primitive, 'Test')
+    u = AMUnsupportPrimitive('Test')
+    assert_equal(u.to_gerber(), 'Test')
+
+
+def test_AMUnsupportPrimitive_smoketest():
+    u = AMUnsupportPrimitive.from_gerber('Test')
+    u.to_inch()
+    u.to_metric()
+
+
+def test_inch():
+    assert_equal(inch(25.4), 1)
+
+
+def test_metric():
+    assert_equal(metric(1), 25.4)
diff --git a/gerber/tests/test_cairo_backend.py b/gerber/tests/test_cairo_backend.py
new file mode 100644
index 0000000..625a23e
--- /dev/null
+++ b/gerber/tests/test_cairo_backend.py
@@ -0,0 +1,189 @@
+#! /usr/bin/env python
+# -*- coding: utf-8 -*-
+
+# Author: Garret Fick <garret@ficksworkshop.com>
+import io
+import os
+
+from ..render.cairo_backend import GerberCairoContext
+from ..rs274x import read
+from .tests import *
+from nose.tools import assert_tuple_equal
+
+def test_render_two_boxes():
+    """Umaco exapmle of two boxes"""
+    _test_render('resources/example_two_square_boxes.gbr', 'golden/example_two_square_boxes.png')
+
+
+def test_render_single_quadrant():
+    """Umaco exapmle of a single quadrant arc"""
+    _test_render('resources/example_single_quadrant.gbr', 'golden/example_single_quadrant.png')
+
+
+def test_render_simple_contour():
+    """Umaco exapmle of a simple arrow-shaped contour"""
+    gerber = _test_render('resources/example_simple_contour.gbr', 'golden/example_simple_contour.png')
+    
+    # Check the resulting dimensions
+    assert_tuple_equal(((2.0, 11.0), (1.0, 9.0)), gerber.bounding_box)
+
+    
+def test_render_single_contour_1():
+    """Umaco example of a single contour
+    
+    The resulting image for this test is used by other tests because they must generate the same output."""
+    _test_render('resources/example_single_contour_1.gbr', 'golden/example_single_contour.png')
+
+
+def test_render_single_contour_2():
+    """Umaco exapmle of a single contour, alternate contour end order
+    
+    The resulting image for this test is used by other tests because they must generate the same output."""
+    _test_render('resources/example_single_contour_2.gbr', 'golden/example_single_contour.png')
+
+
+def test_render_single_contour_3():
+    """Umaco exapmle of a single contour with extra line"""
+    _test_render('resources/example_single_contour_3.gbr', 'golden/example_single_contour_3.png')
+    
+    
+def test_render_not_overlapping_contour():
+    """Umaco example of D02 staring a second contour"""
+    _test_render('resources/example_not_overlapping_contour.gbr', 'golden/example_not_overlapping_contour.png')
+    
+
+def test_render_not_overlapping_touching():
+    """Umaco example of D02 staring a second contour"""
+    _test_render('resources/example_not_overlapping_touching.gbr', 'golden/example_not_overlapping_touching.png')
+
+
+def test_render_overlapping_touching():
+    """Umaco example of D02 staring a second contour"""
+    _test_render('resources/example_overlapping_touching.gbr', 'golden/example_overlapping_touching.png')
+
+
+def test_render_overlapping_contour():
+    """Umaco example of D02 staring a second contour"""
+    _test_render('resources/example_overlapping_contour.gbr', 'golden/example_overlapping_contour.png')
+
+
+def _DISABLED_test_render_level_holes():
+    """Umaco example of using multiple levels to create multiple holes"""
+    
+    # TODO This is clearly rendering wrong. I'm temporarily checking this in because there are more
+    # rendering fixes in the related repository that may resolve these.
+    _test_render('resources/example_level_holes.gbr', 'golden/example_overlapping_contour.png')
+
+
+def _DISABLED_test_render_cutin():
+    """Umaco example of using a cutin"""
+
+    # TODO This is clearly rendering wrong.
+    _test_render('resources/example_cutin.gbr', 'golden/example_cutin.png')
+
+
+def test_render_fully_coincident():
+    """Umaco example of coincident lines rendering two contours"""
+
+    _test_render('resources/example_fully_coincident.gbr', 'golden/example_fully_coincident.png')
+
+
+def test_render_coincident_hole():
+    """Umaco example of coincident lines rendering a hole in the contour"""
+
+    _test_render('resources/example_coincident_hole.gbr', 'golden/example_coincident_hole.png')
+
+
+def test_render_cutin_multiple():
+    """Umaco example of a region with multiple cutins"""
+
+    _test_render('resources/example_cutin_multiple.gbr', 'golden/example_cutin_multiple.png')
+    
+
+def test_flash_circle():
+    """Umaco example a simple circular flash with and without a hole"""
+
+    _test_render('resources/example_flash_circle.gbr', 'golden/example_flash_circle.png')
+
+
+def test_flash_rectangle():
+    """Umaco example a simple rectangular flash with and without a hole"""
+
+    _test_render('resources/example_flash_rectangle.gbr', 'golden/example_flash_rectangle.png')
+
+
+def test_flash_obround():
+    """Umaco example a simple obround flash with and without a hole"""
+
+    _test_render('resources/example_flash_obround.gbr', 'golden/example_flash_obround.png')
+
+
+def test_flash_polygon():
+    """Umaco example a simple polygon flash with and without a hole"""
+
+    _test_render('resources/example_flash_polygon.gbr', 'golden/example_flash_polygon.png')
+
+
+def test_holes_dont_clear():
+    """Umaco example that an aperture with a hole does not clear the area"""
+
+    _test_render('resources/example_holes_dont_clear.gbr', 'golden/example_holes_dont_clear.png')
+
+
+def test_render_am_exposure_modifier():
+    """Umaco example that an aperture macro with a hole does not clear the area"""
+
+    _test_render('resources/example_am_exposure_modifier.gbr', 'golden/example_am_exposure_modifier.png')
+
+
+def _resolve_path(path):
+    return os.path.join(os.path.dirname(__file__),
+                                path)
+
+
+def _test_render(gerber_path, png_expected_path, create_output_path = None):
+    """Render the gerber file and compare to the expected PNG output.
+    
+    Parameters
+    ----------
+    gerber_path : string
+        Path to Gerber file to open
+    png_expected_path : string
+        Path to the PNG file to compare to
+    create_output : string|None
+        If not None, write the generated PNG to the specified path.
+        This is primarily to help with 
+    """
+    
+    gerber_path = _resolve_path(gerber_path)
+    png_expected_path = _resolve_path(png_expected_path)
+    if create_output_path:
+        create_output_path = _resolve_path(create_output_path)
+    
+    gerber = read(gerber_path)
+
+    # Create PNG image to the memory stream
+    ctx = GerberCairoContext()
+    gerber.render(ctx)
+
+    actual_bytes = ctx.dump(None)
+    
+    # If we want to write the file bytes, do it now. This happens
+    if create_output_path:
+        with open(create_output_path, 'wb') as out_file:
+            out_file.write(actual_bytes)
+        # Creating the output is dangerous - it could overwrite the expected result.
+        # So if we are creating the output, we make the test fail on purpose so you
+        # won't forget to disable this
+        assert_false(True, 'Test created the output %s. This needs to be disabled to make sure the test behaves correctly' % (create_output_path,))
+    
+    # Read the expected PNG file
+    
+    with open(png_expected_path, 'rb') as expected_file:
+        expected_bytes = expected_file.read()
+    
+    # Don't directly use assert_equal otherwise any failure pollutes the test results
+    equal = (expected_bytes == actual_bytes)
+    assert_true(equal)
+      
+    return gerber
diff --git a/gerber/tests/test_cam.py b/gerber/tests/test_cam.py
index ce4ec44..a557e8c 100644
--- a/gerber/tests/test_cam.py
+++ b/gerber/tests/test_cam.py
@@ -4,7 +4,7 @@
 # Author: Hamilton Kibbe <ham@hamiltonkib.be>
 
 from ..cam import CamFile, FileSettings
-from tests import *
+from .tests import *
 
 
 def test_filesettings_defaults():
@@ -54,15 +54,107 @@ def test_filesettings_dict_assign():
     assert_equal(fs.zero_suppression, 'leading')
     assert_equal(fs.format, (1, 2))
 
+
 def test_camfile_init():
     """ Smoke test CamFile test
     """
     cf = CamFile()
 
+
 def test_camfile_settings():
     """ Test CamFile Default Settings
     """
     cf = CamFile()
     assert_equal(cf.settings, FileSettings())
+
+
+def test_bounds_override_smoketest():
+    cf = CamFile()
+    cf.bounds
+
+
+def test_zeros():
+    """ Test zero/zero_suppression interaction
+    """
+    fs = FileSettings()
+    assert_equal(fs.zero_suppression, 'trailing')
+    assert_equal(fs.zeros, 'leading')
+
+    fs['zero_suppression'] = 'leading'
+    assert_equal(fs.zero_suppression, 'leading')
+    assert_equal(fs.zeros, 'trailing')
+
+    fs.zero_suppression = 'trailing'
+    assert_equal(fs.zero_suppression, 'trailing')
+    assert_equal(fs.zeros, 'leading')
+
+    fs['zeros'] = 'trailing'
+    assert_equal(fs.zeros, 'trailing')
+    assert_equal(fs.zero_suppression, 'leading')
+
+    fs.zeros = 'leading'
+    assert_equal(fs.zeros, 'leading')
+    assert_equal(fs.zero_suppression, 'trailing')
+
+    fs = FileSettings(zeros='leading')
+    assert_equal(fs.zeros, 'leading')
+    assert_equal(fs.zero_suppression, 'trailing')
+
+    fs = FileSettings(zero_suppression='leading')
+    assert_equal(fs.zeros, 'trailing')
+    assert_equal(fs.zero_suppression, 'leading')
+
+    fs = FileSettings(zeros='leading', zero_suppression='trailing')
+    assert_equal(fs.zeros, 'leading')
+    assert_equal(fs.zero_suppression, 'trailing')
+
+    fs = FileSettings(zeros='trailing', zero_suppression='leading')
+    assert_equal(fs.zeros, 'trailing')
+    assert_equal(fs.zero_suppression, 'leading')
+
+
+def test_filesettings_validation():
+    """ Test FileSettings constructor argument validation
+    """
+<<<<<<< HEAD
+    # absolute-ish is not a valid notation
+    assert_raises(ValueError, FileSettings, 'absolute-ish',
+                  'inch', None, (2, 5), None)
+    
+    # degrees kelvin isn't a valid unit for a CAM file
+    assert_raises(ValueError, FileSettings, 'absolute',
+                  'degrees kelvin', None, (2, 5), None)
+    
+    assert_raises(ValueError, FileSettings, 'absolute',
+                  'inch', 'leading', (2, 5), 'leading')
     
-    
\ No newline at end of file
+    # Technnically this should be an error, but Eangle files often do this incorrectly so we
+    # allow it
+    #assert_raises(ValueError, FileSettings, 'absolute',
+    #              'inch', 'following', (2, 5), None)
+    
+=======
+    assert_raises(ValueError, FileSettings, 'absolute-ish',
+                  'inch', None, (2, 5), None)
+    assert_raises(ValueError, FileSettings, 'absolute',
+                  'degrees kelvin', None, (2, 5), None)
+    assert_raises(ValueError, FileSettings, 'absolute',
+                  'inch', 'leading', (2, 5), 'leading')
+    assert_raises(ValueError, FileSettings, 'absolute',
+                  'inch', 'following', (2, 5), None)
+>>>>>>> 5476da8... Fix a bunch of rendering bugs.
+    assert_raises(ValueError, FileSettings, 'absolute',
+                  'inch', None, (2, 5), 'following')
+    assert_raises(ValueError, FileSettings, 'absolute',
+                  'inch', None, (2, 5, 6), None)
+
+
+def test_key_validation():
+    fs = FileSettings()
+    assert_raises(KeyError, fs.__getitem__, 'octopus')
+    assert_raises(KeyError, fs.__setitem__, 'octopus', 'do not care')
+    assert_raises(ValueError, fs.__setitem__, 'notation', 'absolute-ish')
+    assert_raises(ValueError, fs.__setitem__, 'units', 'degrees kelvin')
+    assert_raises(ValueError, fs.__setitem__, 'zero_suppression', 'following')
+    assert_raises(ValueError, fs.__setitem__, 'zeros', 'following')
+    assert_raises(ValueError, fs.__setitem__, 'format', (2, 5, 6))
diff --git a/gerber/tests/test_common.py b/gerber/tests/test_common.py
index 1e1efe5..357ed18 100644
--- a/gerber/tests/test_common.py
+++ b/gerber/tests/test_common.py
@@ -2,23 +2,40 @@
 # -*- coding: utf-8 -*-
 
 # Author: Hamilton Kibbe <ham@hamiltonkib.be>
-from ..common import read
+from ..exceptions import ParseError
+from ..common import read, loads
 from ..excellon import ExcellonFile
 from ..rs274x import GerberFile
-from tests import *
+from .tests import *
 
 import os
 
 
 NCDRILL_FILE = os.path.join(os.path.dirname(__file__),
-                                'resources/ncdrill.DRD')
+                            'resources/ncdrill.DRD')
 TOP_COPPER_FILE = os.path.join(os.path.dirname(__file__),
-                                'resources/top_copper.GTL')
+                               'resources/top_copper.GTL')
+
 
 def test_file_type_detection():
     """ Test file type detection
     """
     ncdrill = read(NCDRILL_FILE)
     top_copper = read(TOP_COPPER_FILE)
-    assert(isinstance(ncdrill, ExcellonFile))
-    assert(isinstance(top_copper, GerberFile))
+    assert_true(isinstance(ncdrill, ExcellonFile))
+    assert_true(isinstance(top_copper, GerberFile))
+
+
+def test_load_from_string():
+    with open(NCDRILL_FILE, 'rU') as f:
+        ncdrill = loads(f.read())
+    with open(TOP_COPPER_FILE, 'rU') as f:
+        top_copper = loads(f.read())
+    assert_true(isinstance(ncdrill, ExcellonFile))
+    assert_true(isinstance(top_copper, GerberFile))
+
+
+def test_file_type_validation():
+    """ Test file format validation
+    """
+    assert_raises(ParseError, read, 'LICENSE')
diff --git a/gerber/tests/test_excellon.py b/gerber/tests/test_excellon.py
index 72e3d7d..1402938 100644
--- a/gerber/tests/test_excellon.py
+++ b/gerber/tests/test_excellon.py
@@ -2,31 +2,198 @@
 # -*- coding: utf-8 -*-
 
 # Author: Hamilton Kibbe <ham@hamiltonkib.be>
-from ..excellon import read, detect_excellon_format, ExcellonFile
-from tests import *
-
 import os
 
+from ..cam import FileSettings
+from ..excellon import read, detect_excellon_format, ExcellonFile, ExcellonParser
+from ..excellon_statements import ExcellonTool
+from .tests import *
+
+
 NCDRILL_FILE = os.path.join(os.path.dirname(__file__),
-                                'resources/ncdrill.DRD')
+                            'resources/ncdrill.DRD')
+
 
 def test_format_detection():
     """ Test file type detection
     """
-    settings = detect_excellon_format(NCDRILL_FILE)
+    with open(NCDRILL_FILE, "rU") as f:
+        data = f.read()
+    settings = detect_excellon_format(data)
     assert_equal(settings['format'], (2, 4))
-    assert_equal(settings['zero_suppression'], 'leading')
+    assert_equal(settings['zeros'], 'trailing')
+
+    settings = detect_excellon_format(filename=NCDRILL_FILE)
+    assert_equal(settings['format'], (2, 4))
+    assert_equal(settings['zeros'], 'trailing')
+
 
 def test_read():
     ncdrill = read(NCDRILL_FILE)
     assert(isinstance(ncdrill, ExcellonFile))
-    
+
+
+def test_write():
+    ncdrill = read(NCDRILL_FILE)
+    ncdrill.write('test.ncd')
+    with open(NCDRILL_FILE, "rU") as src:
+        srclines = src.readlines()
+    with open('test.ncd', "rU") as res:
+        for idx, line in enumerate(res):
+            assert_equal(line.strip(), srclines[idx].strip())
+    os.remove('test.ncd')
+
+
 def test_read_settings():
     ncdrill = read(NCDRILL_FILE)
-    assert_equal(ncdrill.settings.format, (2, 4))
-    assert_equal(ncdrill.settings.zero_suppression, 'leading')
-    
-    
-    
-    
-    
+    assert_equal(ncdrill.settings['format'], (2, 4))
+    assert_equal(ncdrill.settings['zeros'], 'trailing')
+
+
+def test_bounds():
+    ncdrill = read(NCDRILL_FILE)
+    xbound, ybound = ncdrill.bounds
+    assert_array_almost_equal(xbound, (0.1300, 2.1430))
+    assert_array_almost_equal(ybound, (0.3946, 1.7164))
+
+
+def test_report():
+    ncdrill = read(NCDRILL_FILE)
+
+
+def test_conversion():
+    import copy
+    ncdrill = read(NCDRILL_FILE)
+    assert_equal(ncdrill.settings.units, 'inch')
+    ncdrill_inch = copy.deepcopy(ncdrill)
+    ncdrill.to_metric()
+    assert_equal(ncdrill.settings.units, 'metric')
+    inch_primitives = ncdrill_inch.primitives
+    for tool in iter(ncdrill_inch.tools.values()):
+        tool.to_metric()
+    for primitive in inch_primitives:
+        primitive.to_metric()
+    for statement in ncdrill_inch.statements:
+        statement.to_metric()
+
+    for m_tool, i_tool in zip(iter(ncdrill.tools.values()),
+                              iter(ncdrill_inch.tools.values())):
+        assert_equal(i_tool, m_tool)
+
+    for m, i in zip(ncdrill.primitives, inch_primitives):
+        assert_equal(m.position, i.position, '%s not equal to %s' % (m, i))
+        assert_equal(m.diameter, i.diameter, '%s not equal to %s' % (m, i))
+
+
+def test_parser_hole_count():
+    settings = FileSettings(**detect_excellon_format(NCDRILL_FILE))
+    p = ExcellonParser(settings)
+    p.parse(NCDRILL_FILE)
+    assert_equal(p.hole_count, 36)
+
+
+def test_parser_hole_sizes():
+    settings = FileSettings(**detect_excellon_format(NCDRILL_FILE))
+    p = ExcellonParser(settings)
+    p.parse(NCDRILL_FILE)
+    assert_equal(p.hole_sizes, [0.0236, 0.0354, 0.04, 0.126, 0.128])
+
+
+def test_parse_whitespace():
+    p = ExcellonParser(FileSettings())
+    assert_equal(p._parse_line('         '), None)
+
+
+def test_parse_comment():
+    p = ExcellonParser(FileSettings())
+    p._parse_line(';A comment')
+    assert_equal(p.statements[0].comment, 'A comment')
+
+
+def test_parse_format_comment():
+    p = ExcellonParser(FileSettings())
+    p._parse_line('; FILE_FORMAT=9:9 ')
+    assert_equal(p.format, (9, 9))
+
+
+def test_parse_header():
+    p = ExcellonParser(FileSettings())
+    p._parse_line('M48   ')
+    assert_equal(p.state, 'HEADER')
+    p._parse_line('M95   ')
+    assert_equal(p.state, 'DRILL')
+
+
+def test_parse_rout():
+    p = ExcellonParser(FileSettings())
+    p._parse_line('G00  ')
+    assert_equal(p.state, 'ROUT')
+    p._parse_line('G05 ')
+    assert_equal(p.state, 'DRILL')
+
+
+def test_parse_version():
+    p = ExcellonParser(FileSettings())
+    p._parse_line('VER,1  ')
+    assert_equal(p.statements[0].version, 1)
+    p._parse_line('VER,2  ')
+    assert_equal(p.statements[1].version, 2)
+
+
+def test_parse_format():
+    p = ExcellonParser(FileSettings())
+    p._parse_line('FMAT,1  ')
+    assert_equal(p.statements[0].format, 1)
+    p._parse_line('FMAT,2  ')
+    assert_equal(p.statements[1].format, 2)
+
+
+def test_parse_units():
+    settings = FileSettings(units='inch', zeros='trailing')
+    p = ExcellonParser(settings)
+    p._parse_line(';METRIC,LZ')
+    assert_equal(p.units, 'inch')
+    assert_equal(p.zeros, 'trailing')
+    p._parse_line('METRIC,LZ')
+    assert_equal(p.units, 'metric')
+    assert_equal(p.zeros, 'leading')
+
+
+def test_parse_incremental_mode():
+    settings = FileSettings(units='inch', zeros='trailing')
+    p = ExcellonParser(settings)
+    assert_equal(p.notation, 'absolute')
+    p._parse_line('ICI,ON  ')
+    assert_equal(p.notation, 'incremental')
+    p._parse_line('ICI,OFF  ')
+    assert_equal(p.notation, 'absolute')
+
+
+def test_parse_absolute_mode():
+    settings = FileSettings(units='inch', zeros='trailing')
+    p = ExcellonParser(settings)
+    assert_equal(p.notation, 'absolute')
+    p._parse_line('ICI,ON  ')
+    assert_equal(p.notation, 'incremental')
+    p._parse_line('G90  ')
+    assert_equal(p.notation, 'absolute')
+
+
+def test_parse_repeat_hole():
+    p = ExcellonParser(FileSettings())
+    p.active_tool = ExcellonTool(FileSettings(), number=8)
+    p._parse_line('R03X1.5Y1.5')
+    assert_equal(p.statements[0].count, 3)
+
+
+def test_parse_incremental_position():
+    p = ExcellonParser(FileSettings(notation='incremental'))
+    p._parse_line('X01Y01')
+    p._parse_line('X01Y01')
+    assert_equal(p.pos, [2., 2.])
+
+
+def test_parse_unknown():
+    p = ExcellonParser(FileSettings())
+    p._parse_line('Not A Valid Statement')
+    assert_equal(p.statements[0].stmt, 'Not A Valid Statement')
diff --git a/gerber/tests/test_excellon_statements.py b/gerber/tests/test_excellon_statements.py
index f2e17ee..8e6e06e 100644
--- a/gerber/tests/test_excellon_statements.py
+++ b/gerber/tests/test_excellon_statements.py
@@ -3,31 +3,62 @@
 
 # Author: Hamilton Kibbe <ham@hamiltonkib.be>
 
-from .tests import assert_equal, assert_raises
+from .tests import assert_equal, assert_not_equal, assert_raises
 from ..excellon_statements import *
 from ..cam import FileSettings
 
 
+def test_excellon_statement_implementation():
+    stmt = ExcellonStatement()
+    assert_raises(NotImplementedError, stmt.from_excellon, None)
+    assert_raises(NotImplementedError, stmt.to_excellon)
+
+
+def test_excellontstmt():
+    """ Smoke test ExcellonStatement
+    """
+    stmt = ExcellonStatement()
+    stmt.to_inch()
+    stmt.to_metric()
+    stmt.offset()
+
+
 def test_excellontool_factory():
-    """ Test ExcellonTool factory method
+    """ Test ExcellonTool factory methods
     """
-    exc_line = 'T8F00S00C0.12500'
+    exc_line = 'T8F01B02S00003H04Z05C0.12500'
     settings = FileSettings(format=(2, 5), zero_suppression='trailing',
-                units='inch', notation='absolute')
+                            units='inch', notation='absolute')
     tool = ExcellonTool.from_excellon(exc_line, settings)
+    assert_equal(tool.number, 8)
+    assert_equal(tool.diameter, 0.125)
+    assert_equal(tool.feed_rate, 1)
+    assert_equal(tool.retract_rate, 2)
+    assert_equal(tool.rpm, 3)
+    assert_equal(tool.max_hit_count, 4)
+    assert_equal(tool.depth_offset, 5)
+
+    stmt = {'number': 8, 'feed_rate': 1, 'retract_rate': 2, 'rpm': 3,
+            'diameter': 0.125, 'max_hit_count': 4, 'depth_offset': 5}
+    tool = ExcellonTool.from_dict(settings, stmt)
+    assert_equal(tool.number, 8)
     assert_equal(tool.diameter, 0.125)
-    assert_equal(tool.feed_rate, 0)
-    assert_equal(tool.rpm, 0)
+    assert_equal(tool.feed_rate, 1)
+    assert_equal(tool.retract_rate, 2)
+    assert_equal(tool.rpm, 3)
+    assert_equal(tool.max_hit_count, 4)
+    assert_equal(tool.depth_offset, 5)
 
 
 def test_excellontool_dump():
     """ Test ExcellonTool to_excellon()
     """
-    exc_lines = ['T1F00S00C0.01200', 'T2F00S00C0.01500', 'T3F00S00C0.01968',
-                 'T4F00S00C0.02800', 'T5F00S00C0.03300', 'T6F00S00C0.03800',
-                 'T7F00S00C0.04300', 'T8F00S00C0.12500', 'T9F00S00C0.13000', ]
+    exc_lines = ['T01F0S0C0.01200', 'T02F0S0C0.01500', 'T03F0S0C0.01968',
+                 'T04F0S0C0.02800', 'T05F0S0C0.03300', 'T06F0S0C0.03800',
+                 'T07F0S0C0.04300', 'T08F0S0C0.12500', 'T09F0S0C0.13000',
+                 'T08B01F02H03S00003C0.12500Z04', 'T01F0S300.999C0.01200']
     settings = FileSettings(format=(2, 5), zero_suppression='trailing',
-                units='inch', notation='absolute')
+                            units='inch', notation='absolute')
     for line in exc_lines:
         tool = ExcellonTool.from_excellon(line, settings)
         assert_equal(tool.to_excellon(), line)
@@ -35,7 +66,7 @@ def test_excellontool_dump():
 
 def test_excellontool_order():
     settings = FileSettings(format=(2, 5), zero_suppression='trailing',
-                units='inch', notation='absolute')
+                            units='inch', notation='absolute')
     line = 'T8F00S00C0.12500'
     tool1 = ExcellonTool.from_excellon(line, settings)
     line = 'T8C0.12500F00S00'
@@ -45,6 +76,47 @@ def test_excellontool_order():
     assert_equal(tool1.rpm, tool2.rpm)
 
 
+def test_excellontool_conversion():
+    tool = ExcellonTool.from_dict(FileSettings(units='metric'),
+                                  {'number': 8, 'diameter': 25.4})
+    tool.to_inch()
+    assert_equal(tool.diameter, 1.)
+    tool = ExcellonTool.from_dict(FileSettings(units='inch'),
+                                  {'number': 8, 'diameter': 1.})
+    tool.to_metric()
+    assert_equal(tool.diameter, 25.4)
+
+    # Shouldn't change units if we're already using target units
+    tool = ExcellonTool.from_dict(FileSettings(units='inch'),
+                                  {'number': 8, 'diameter': 25.4})
+    tool.to_inch()
+    assert_equal(tool.diameter, 25.4)
+    tool = ExcellonTool.from_dict(FileSettings(units='metric'),
+                                  {'number': 8, 'diameter': 1.})
+    tool.to_metric()
+    assert_equal(tool.diameter, 1.)
+
+
+def test_excellontool_repr():
+    tool = ExcellonTool.from_dict(FileSettings(),
+                                  {'number': 8, 'diameter': 0.125})
+    assert_equal(str(tool), '<ExcellonTool 08: 0.125in. dia.>')
+    tool = ExcellonTool.from_dict(FileSettings(units='metric'),
+                                  {'number': 8, 'diameter': 0.125})
+    assert_equal(str(tool), '<ExcellonTool 08: 0.125mm dia.>')
+
+
+def test_excellontool_equality():
+    t = ExcellonTool.from_dict(
+        FileSettings(), {'number': 8, 'diameter': 0.125})
+    t1 = ExcellonTool.from_dict(
+        FileSettings(), {'number': 8, 'diameter': 0.125})
+    assert_equal(t, t1)
+    t1 = ExcellonTool.from_dict(FileSettings(units='metric'),
+                                {'number': 8, 'diameter': 0.125})
+    assert_not_equal(t, t1)
+
+
 def test_toolselection_factory():
     """ Test ToolSelectionStmt factory method
     """
@@ -54,6 +126,9 @@ def test_toolselection_factory():
     stmt = ToolSelectionStmt.from_excellon('T0223')
     assert_equal(stmt.tool, 2)
     assert_equal(stmt.compensation_index, 23)
+    stmt = ToolSelectionStmt.from_excellon('T042')
+    assert_equal(stmt.tool, 42)
+    assert_equal(stmt.compensation_index, None)
 
 
 def test_toolselection_dump():
@@ -65,32 +140,202 @@ def test_toolselection_dump():
         assert_equal(stmt.to_excellon(), line)
 
 
+def test_z_axis_infeed_rate_factory():
+    """ Test ZAxisInfeedRateStmt factory method
+    """
+    stmt = ZAxisInfeedRateStmt.from_excellon('F01')
+    assert_equal(stmt.rate, 1)
+    stmt = ZAxisInfeedRateStmt.from_excellon('F2')
+    assert_equal(stmt.rate, 2)
+    stmt = ZAxisInfeedRateStmt.from_excellon('F03')
+    assert_equal(stmt.rate, 3)
+
+
+def test_z_axis_infeed_rate_dump():
+    """ Test ZAxisInfeedRateStmt to_excellon()
+    """
+    inputs = [
+        ('F01', 'F01'),
+        ('F2', 'F02'),
+        ('F00003', 'F03')
+    ]
+    for input_rate, expected_output in inputs:
+        stmt = ZAxisInfeedRateStmt.from_excellon(input_rate)
+        assert_equal(stmt.to_excellon(), expected_output)
+
+
 def test_coordinatestmt_factory():
     """ Test CoordinateStmt factory method
     """
+    settings = FileSettings(format=(2, 5), zero_suppression='trailing',
+                            units='inch', notation='absolute')
+
     line = 'X0278207Y0065293'
-    stmt = CoordinateStmt.from_excellon(line)
+    stmt = CoordinateStmt.from_excellon(line, settings)
     assert_equal(stmt.x, 2.78207)
     assert_equal(stmt.y, 0.65293)
 
-    line = 'X02945'
-    stmt = CoordinateStmt.from_excellon(line)
-    assert_equal(stmt.x, 2.945)
+    # line = 'X02945'
+    # stmt = CoordinateStmt.from_excellon(line)
+    # assert_equal(stmt.x, 2.945)
+
+    # line = 'Y00575'
+    # stmt = CoordinateStmt.from_excellon(line)
+    # assert_equal(stmt.y, 0.575)
+
+    settings = FileSettings(format=(2, 4), zero_suppression='leading',
+                            units='inch', notation='absolute')
+
+    line = 'X9660Y4639'
+    stmt = CoordinateStmt.from_excellon(line, settings)
+    assert_equal(stmt.x, 0.9660)
+    assert_equal(stmt.y, 0.4639)
+    assert_equal(stmt.to_excellon(settings), "X9660Y4639")
+    assert_equal(stmt.units, 'inch')
 
-    line = 'Y00575'
-    stmt = CoordinateStmt.from_excellon(line)
-    assert_equal(stmt.y, 0.575)
+    settings.units = 'metric'
+    stmt = CoordinateStmt.from_excellon(line, settings)
+    assert_equal(stmt.units, 'metric')
 
 
 def test_coordinatestmt_dump():
     """ Test CoordinateStmt to_excellon()
     """
-    lines = ['X0278207Y0065293', 'X0243795', 'Y0082528', 'Y0086028',
-             'X0251295Y0081528', 'X02525Y0078', 'X0255Y00575', 'Y0052',
-             'X02675', 'Y00575', 'X02425', 'Y0052', 'X023', ]
+    lines = ['X278207Y65293', 'X243795', 'Y82528', 'Y86028',
+             'X251295Y81528', 'X2525Y78', 'X255Y575', 'Y52',
+             'X2675', 'Y575', 'X2425', 'Y52', 'X23', ]
+    settings = FileSettings(format=(2, 4), zero_suppression='leading',
+                            units='inch', notation='absolute')
     for line in lines:
-        stmt = CoordinateStmt.from_excellon(line)
-        assert_equal(stmt.to_excellon(), line)
+        stmt = CoordinateStmt.from_excellon(line, settings)
+        assert_equal(stmt.to_excellon(settings), line)
+
+
+def test_coordinatestmt_conversion():
+
+    settings = FileSettings()
+    settings.units = 'metric'
+    stmt = CoordinateStmt.from_excellon('X254Y254', settings)
+
+    # No effect
+    stmt.to_metric()
+    assert_equal(stmt.x, 25.4)
+    assert_equal(stmt.y, 25.4)
+
+    stmt.to_inch()
+    assert_equal(stmt.units, 'inch')
+    assert_equal(stmt.x, 1.)
+    assert_equal(stmt.y, 1.)
+
+    # No effect
+    stmt.to_inch()
+    assert_equal(stmt.x, 1.)
+    assert_equal(stmt.y, 1.)
+
+    settings.units = 'inch'
+    stmt = CoordinateStmt.from_excellon('X01Y01', settings)
+
+    # No effect
+    stmt.to_inch()
+    assert_equal(stmt.x, 1.)
+    assert_equal(stmt.y, 1.)
+
+    stmt.to_metric()
+    assert_equal(stmt.units, 'metric')
+    assert_equal(stmt.x, 25.4)
+    assert_equal(stmt.y, 25.4)
+
+    # No effect
+    stmt.to_metric()
+    assert_equal(stmt.x, 25.4)
+    assert_equal(stmt.y, 25.4)
+
+
+def test_coordinatestmt_offset():
+    stmt = CoordinateStmt.from_excellon('X01Y01', FileSettings())
+    stmt.offset()
+    assert_equal(stmt.x, 1)
+    assert_equal(stmt.y, 1)
+    stmt.offset(1, 0)
+    assert_equal(stmt.x, 2.)
+    assert_equal(stmt.y, 1.)
+    stmt.offset(0, 1)
+    assert_equal(stmt.x, 2.)
+    assert_equal(stmt.y, 2.)
+
+
+def test_coordinatestmt_string():
+    settings = FileSettings(format=(2, 4), zero_suppression='leading',
+                            units='inch', notation='absolute')
+    stmt = CoordinateStmt.from_excellon('X9660Y4639', settings)
+    assert_equal(str(stmt), '<Coordinate Statement: X: 0.966 Y: 0.4639 >')
+
+
+def test_repeathole_stmt_factory():
+    stmt = RepeatHoleStmt.from_excellon('R0004X015Y32',
+                                        FileSettings(zeros='leading',
+                                                     units='inch'))
+    assert_equal(stmt.count, 4)
+    assert_equal(stmt.xdelta, 1.5)
+    assert_equal(stmt.ydelta, 32)
+    assert_equal(stmt.units, 'inch')
+
+    stmt = RepeatHoleStmt.from_excellon('R0004X015Y32',
+                                        FileSettings(zeros='leading',
+                                                     units='metric'))
+    assert_equal(stmt.units, 'metric')
+
+
+def test_repeatholestmt_dump():
+    line = 'R4X015Y32'
+    stmt = RepeatHoleStmt.from_excellon(line, FileSettings())
+    assert_equal(stmt.to_excellon(FileSettings()), line)
+
+
+def test_repeatholestmt_conversion():
+    line = 'R4X0254Y254'
+    settings = FileSettings()
+    settings.units = 'metric'
+    stmt = RepeatHoleStmt.from_excellon(line, settings)
+
+    # No effect
+    stmt.to_metric()
+    assert_equal(stmt.xdelta, 2.54)
+    assert_equal(stmt.ydelta, 25.4)
+
+    stmt.to_inch()
+    assert_equal(stmt.units, 'inch')
+    assert_equal(stmt.xdelta, 0.1)
+    assert_equal(stmt.ydelta, 1.)
+
+    # no effect
+    stmt.to_inch()
+    assert_equal(stmt.xdelta, 0.1)
+    assert_equal(stmt.ydelta, 1.)
+
+    line = 'R4X01Y1'
+    settings.units = 'inch'
+    stmt = RepeatHoleStmt.from_excellon(line, settings)
+
+    # no effect
+    stmt.to_inch()
+    assert_equal(stmt.xdelta, 1.)
+    assert_equal(stmt.ydelta, 10.)
+
+    stmt.to_metric()
+    assert_equal(stmt.units, 'metric')
+    assert_equal(stmt.xdelta, 25.4)
+    assert_equal(stmt.ydelta, 254.)
+
+    # No effect
+    stmt.to_metric()
+    assert_equal(stmt.xdelta, 25.4)
+    assert_equal(stmt.ydelta, 254.)
+
+
+def test_repeathole_str():
+    stmt = RepeatHoleStmt.from_excellon('R4X015Y32', FileSettings())
+    assert_equal(str(stmt), '<Repeat Hole: 4 times, offset X: 1.5 Y: 32>')
 
 
 def test_commentstmt_factory():
@@ -118,18 +363,147 @@ def test_commentstmt_dump():
         assert_equal(stmt.to_excellon(), line)
 
 
+def test_header_begin_stmt():
+    stmt = HeaderBeginStmt()
+    assert_equal(stmt.to_excellon(None), 'M48')
+
+
+def test_header_end_stmt():
+    stmt = HeaderEndStmt()
+    assert_equal(stmt.to_excellon(None), 'M95')
+
+
+def test_rewindstop_stmt():
+    stmt = RewindStopStmt()
+    assert_equal(stmt.to_excellon(None), '%')
+
+
+def test_z_axis_rout_position_stmt():
+    stmt = ZAxisRoutPositionStmt()
+    assert_equal(stmt.to_excellon(None), 'M15')
+
+
+def test_retract_with_clamping_stmt():
+    stmt = RetractWithClampingStmt()
+    assert_equal(stmt.to_excellon(None), 'M16')
+
+
+def test_retract_without_clamping_stmt():
+    stmt = RetractWithoutClampingStmt()
+    assert_equal(stmt.to_excellon(None), 'M17')
+
+
+def test_cutter_compensation_off_stmt():
+    stmt = CutterCompensationOffStmt()
+    assert_equal(stmt.to_excellon(None), 'G40')
+
+
+def test_cutter_compensation_left_stmt():
+    stmt = CutterCompensationLeftStmt()
+    assert_equal(stmt.to_excellon(None), 'G41')
+
+
+def test_cutter_compensation_right_stmt():
+    stmt = CutterCompensationRightStmt()
+    assert_equal(stmt.to_excellon(None), 'G42')
+
+
+def test_endofprogramstmt_factory():
+    settings = FileSettings(units='inch')
+    stmt = EndOfProgramStmt.from_excellon('M30X01Y02', settings)
+    assert_equal(stmt.x, 1.)
+    assert_equal(stmt.y, 2.)
+    assert_equal(stmt.units, 'inch')
+    settings.units = 'metric'
+    stmt = EndOfProgramStmt.from_excellon('M30X01', settings)
+    assert_equal(stmt.x, 1.)
+    assert_equal(stmt.y, None)
+    assert_equal(stmt.units, 'metric')
+    stmt = EndOfProgramStmt.from_excellon('M30Y02', FileSettings())
+    assert_equal(stmt.x, None)
+    assert_equal(stmt.y, 2.)
+
+
+def test_endofprogramStmt_dump():
+    lines = ['M30X01Y02', ]
+    for line in lines:
+        stmt = EndOfProgramStmt.from_excellon(line, FileSettings())
+        assert_equal(stmt.to_excellon(FileSettings()), line)
+
+
+def test_endofprogramstmt_conversion():
+    settings = FileSettings()
+    settings.units = 'metric'
+    stmt = EndOfProgramStmt.from_excellon('M30X0254Y254', settings)
+    # No effect
+    stmt.to_metric()
+    assert_equal(stmt.x, 2.54)
+    assert_equal(stmt.y, 25.4)
+
+    stmt.to_inch()
+    assert_equal(stmt.units, 'inch')
+    assert_equal(stmt.x, 0.1)
+    assert_equal(stmt.y, 1.0)
+
+    # No effect
+    stmt.to_inch()
+    assert_equal(stmt.x, 0.1)
+    assert_equal(stmt.y, 1.0)
+
+    settings.units = 'inch'
+    stmt = EndOfProgramStmt.from_excellon('M30X01Y1', settings)
+
+    # No effect
+    stmt.to_inch()
+    assert_equal(stmt.x, 1.)
+    assert_equal(stmt.y, 10.0)
+
+    stmt.to_metric()
+    assert_equal(stmt.units, 'metric')
+    assert_equal(stmt.x, 25.4)
+    assert_equal(stmt.y, 254.)
+
+    # No effect
+    stmt.to_metric()
+    assert_equal(stmt.x, 25.4)
+    assert_equal(stmt.y, 254.)
+
+
+def test_endofprogramstmt_offset():
+    stmt = EndOfProgramStmt(1, 1)
+    stmt.offset()
+    assert_equal(stmt.x, 1)
+    assert_equal(stmt.y, 1)
+    stmt.offset(1, 0)
+    assert_equal(stmt.x, 2.)
+    assert_equal(stmt.y, 1.)
+    stmt.offset(0, 1)
+    assert_equal(stmt.x, 2.)
+    assert_equal(stmt.y, 2.)
+
+
 def test_unitstmt_factory():
     """ Test UnitStmt factory method
     """
     line = 'INCH,LZ'
     stmt = UnitStmt.from_excellon(line)
     assert_equal(stmt.units, 'inch')
-    assert_equal(stmt.zero_suppression, 'trailing')
+    assert_equal(stmt.zeros, 'leading')
+
+    line = 'INCH,TZ'
+    stmt = UnitStmt.from_excellon(line)
+    assert_equal(stmt.units, 'inch')
+    assert_equal(stmt.zeros, 'trailing')
+
+    line = 'METRIC,LZ'
+    stmt = UnitStmt.from_excellon(line)
+    assert_equal(stmt.units, 'metric')
+    assert_equal(stmt.zeros, 'leading')
 
     line = 'METRIC,TZ'
     stmt = UnitStmt.from_excellon(line)
     assert_equal(stmt.units, 'metric')
-    assert_equal(stmt.zero_suppression, 'leading')
+    assert_equal(stmt.zeros, 'trailing')
 
 
 def test_unitstmt_dump():
@@ -141,6 +515,16 @@ def test_unitstmt_dump():
         assert_equal(stmt.to_excellon(), line)
 
 
+def test_unitstmt_conversion():
+    stmt = UnitStmt.from_excellon('METRIC,TZ')
+    stmt.to_inch()
+    assert_equal(stmt.units, 'inch')
+
+    stmt = UnitStmt.from_excellon('INCH,TZ')
+    stmt.to_metric()
+    assert_equal(stmt.units, 'metric')
+
+
 def test_incrementalmode_factory():
     """ Test IncrementalModeStmt factory method
     """
@@ -188,6 +572,7 @@ def test_versionstmt_dump():
         stmt = VersionStmt.from_excellon(line)
         assert_equal(stmt.to_excellon(), line)
 
+
 def test_versionstmt_validation():
     """ Test VersionStmt input validation
     """
@@ -268,3 +653,48 @@ def test_measmodestmt_validation():
     """
     assert_raises(ValueError, MeasuringModeStmt.from_excellon, 'M70')
     assert_raises(ValueError, MeasuringModeStmt, 'millimeters')
+
+
+def test_measmodestmt_conversion():
+    line = 'M72'
+    stmt = MeasuringModeStmt.from_excellon(line)
+    assert_equal(stmt.units, 'inch')
+    stmt.to_metric()
+    assert_equal(stmt.units, 'metric')
+
+    line = 'M71'
+    stmt = MeasuringModeStmt.from_excellon(line)
+    assert_equal(stmt.units, 'metric')
+    stmt.to_inch()
+    assert_equal(stmt.units, 'inch')
+
+
+def test_routemode_stmt():
+    stmt = RouteModeStmt()
+    assert_equal(stmt.to_excellon(FileSettings()), 'G00')
+
+
+def test_linearmode_stmt():
+    stmt = LinearModeStmt()
+    assert_equal(stmt.to_excellon(FileSettings()), 'G01')
+
+
+def test_drillmode_stmt():
+    stmt = DrillModeStmt()
+    assert_equal(stmt.to_excellon(FileSettings()), 'G05')
+
+
+def test_absolutemode_stmt():
+    stmt = AbsoluteModeStmt()
+    assert_equal(stmt.to_excellon(FileSettings()), 'G90')
+
+
+def test_unknownstmt():
+    stmt = UnknownStmt('TEST')
+    assert_equal(stmt.stmt, 'TEST')
+    assert_equal(str(stmt), '<Unknown Statement: TEST>')
+
+
+def test_unknownstmt_dump():
+    stmt = UnknownStmt('TEST')
+    assert_equal(stmt.to_excellon(FileSettings()), 'TEST')
diff --git a/gerber/tests/test_gerber_statements.py b/gerber/tests/test_gerber_statements.py
index a463c9d..2157390 100644
--- a/gerber/tests/test_gerber_statements.py
+++ b/gerber/tests/test_gerber_statements.py
@@ -5,6 +5,19 @@
 
 from .tests import *
 from ..gerber_statements import *
+from ..cam import FileSettings
+
+
+def test_Statement_smoketest():
+    stmt = Statement('Test')
+    assert_equal(stmt.type, 'Test')
+    stmt.to_metric()
+    assert_in('units=metric', str(stmt))
+    stmt.to_inch()
+    assert_in('units=inch', str(stmt))
+    stmt.to_metric()
+    stmt.offset(1, 1)
+    assert_in('type=Test', str(stmt))
 
 
 def test_FSParamStmt_factory():
@@ -24,6 +37,7 @@ def test_FSParamStmt_factory():
     assert_equal(fs.notation, 'incremental')
     assert_equal(fs.format, (2, 7))
 
+
 def test_FSParamStmt():
     """ Test FSParamStmt initialization
     """
@@ -37,6 +51,7 @@ def test_FSParamStmt():
     assert_equal(stmt.notation, notation)
     assert_equal(stmt.format, fmt)
 
+
 def test_FSParamStmt_dump():
     """ Test FSParamStmt to_gerber()
     """
@@ -48,6 +63,23 @@ def test_FSParamStmt_dump():
     fs = FSParamStmt.from_dict(stmt)
     assert_equal(fs.to_gerber(), '%FSTIX25Y25*%')
 
+    settings = FileSettings(zero_suppression='leading', notation='absolute')
+    assert_equal(fs.to_gerber(settings), '%FSLAX25Y25*%')
+
+
+def test_FSParamStmt_string():
+    """ Test FSParamStmt.__str__()
+    """
+    stmt = {'param': 'FS', 'zero': 'L', 'notation': 'A', 'x': '27'}
+    fs = FSParamStmt.from_dict(stmt)
+    assert_equal(str(fs),
+                 '<Format Spec: 2:7 leading zero suppression absolute notation>')
+
+    stmt = {'param': 'FS', 'zero': 'T', 'notation': 'I', 'x': '25'}
+    fs = FSParamStmt.from_dict(stmt)
+    assert_equal(str(fs),
+                 '<Format Spec: 2:5 trailing zero suppression incremental notation>')
+
 
 def test_MOParamStmt_factory():
     """ Test MOParamStruct factory
@@ -64,6 +96,13 @@ def test_MOParamStmt_factory():
         assert_equal(mo.param, 'MO')
         assert_equal(mo.mode, 'metric')
 
+    stmt = {'param': 'MO'}
+    mo = MOParamStmt.from_dict(stmt)
+    assert_equal(mo.mode, None)
+    stmt = {'param': 'MO', 'mo': 'degrees kelvin'}
+    assert_raises(ValueError, MOParamStmt.from_dict, stmt)
+
+
 def test_MOParamStmt():
     """ Test MOParamStmt initialization
     """
@@ -89,6 +128,30 @@ def test_MOParamStmt_dump():
     assert_equal(mo.to_gerber(), '%MOMM*%')
 
 
+def test_MOParamStmt_conversion():
+    stmt = {'param': 'MO', 'mo': 'MM'}
+    mo = MOParamStmt.from_dict(stmt)
+    mo.to_inch()
+    assert_equal(mo.mode, 'inch')
+
+    stmt = {'param': 'MO', 'mo': 'IN'}
+    mo = MOParamStmt.from_dict(stmt)
+    mo.to_metric()
+    assert_equal(mo.mode, 'metric')
+
+
+def test_MOParamStmt_string():
+    """ Test MOParamStmt.__str__()
+    """
+    stmt = {'param': 'MO', 'mo': 'IN'}
+    mo = MOParamStmt.from_dict(stmt)
+    assert_equal(str(mo), '<Mode: inches>')
+
+    stmt = {'param': 'MO', 'mo': 'MM'}
+    mo = MOParamStmt.from_dict(stmt)
+    assert_equal(str(mo), '<Mode: millimeters>')
+
+
 def test_IPParamStmt_factory():
     """ Test IPParamStruct factory
     """
@@ -100,6 +163,7 @@ def test_IPParamStmt_factory():
     ip = IPParamStmt.from_dict(stmt)
     assert_equal(ip.ip, 'negative')
 
+
 def test_IPParamStmt():
     """ Test IPParamStmt initialization
     """
@@ -122,14 +186,44 @@ def test_IPParamStmt_dump():
     assert_equal(ip.to_gerber(), '%IPNEG*%')
 
 
+def test_IPParamStmt_string():
+    stmt = {'param': 'IP', 'ip': 'POS'}
+    ip = IPParamStmt.from_dict(stmt)
+    assert_equal(str(ip), '<Image Polarity: positive>')
+
+    stmt = {'param': 'IP', 'ip': 'NEG'}
+    ip = IPParamStmt.from_dict(stmt)
+    assert_equal(str(ip), '<Image Polarity: negative>')
+
+
+def test_IRParamStmt_factory():
+    stmt = {'param': 'IR', 'angle': '45'}
+    ir = IRParamStmt.from_dict(stmt)
+    assert_equal(ir.param, 'IR')
+    assert_equal(ir.angle, 45)
+
+
+def test_IRParamStmt_dump():
+    stmt = {'param': 'IR', 'angle': '45'}
+    ir = IRParamStmt.from_dict(stmt)
+    assert_equal(ir.to_gerber(), '%IR45*%')
+
+
+def test_IRParamStmt_string():
+    stmt = {'param': 'IR', 'angle': '45'}
+    ir = IRParamStmt.from_dict(stmt)
+    assert_equal(str(ir), '<Image Angle: 45>')
+
+
 def test_OFParamStmt_factory():
-    """ Test OFParamStmt factory 
+    """ Test OFParamStmt factory
     """
     stmt = {'param': 'OF', 'a': '0.1234567', 'b': '0.1234567'}
     of = OFParamStmt.from_dict(stmt)
     assert_equal(of.a, 0.1234567)
     assert_equal(of.b, 0.1234567)
 
+
 def test_OFParamStmt():
     """ Test IPParamStmt initialization
     """
@@ -139,13 +233,142 @@ def test_OFParamStmt():
         assert_equal(stmt.param, param)
         assert_equal(stmt.a, val)
         assert_equal(stmt.b, val)
-    
+
+
 def test_OFParamStmt_dump():
     """ Test OFParamStmt to_gerber()
     """
-    stmt = {'param': 'OF', 'a': '0.1234567', 'b': '0.1234567'}
+    stmt = {'param': 'OF', 'a': '0.123456', 'b': '0.123456'}
+    of = OFParamStmt.from_dict(stmt)
+    assert_equal(of.to_gerber(), '%OFA0.12345B0.12345*%')
+
+
+def test_OFParamStmt_conversion():
+    stmt = {'param': 'OF', 'a': '2.54', 'b': '25.4'}
+    of = OFParamStmt.from_dict(stmt)
+    of.units = 'metric'
+
+    # No effect
+    of.to_metric()
+    assert_equal(of.a, 2.54)
+    assert_equal(of.b, 25.4)
+
+    of.to_inch()
+    assert_equal(of.units, 'inch')
+    assert_equal(of.a, 0.1)
+    assert_equal(of.b, 1.0)
+
+    # No effect
+    of.to_inch()
+    assert_equal(of.a, 0.1)
+    assert_equal(of.b, 1.0)
+
+    stmt = {'param': 'OF', 'a': '0.1', 'b': '1.0'}
+    of = OFParamStmt.from_dict(stmt)
+    of.units = 'inch'
+
+    # No effect
+    of.to_inch()
+    assert_equal(of.a, 0.1)
+    assert_equal(of.b, 1.0)
+
+    of.to_metric()
+    assert_equal(of.units, 'metric')
+    assert_equal(of.a, 2.54)
+    assert_equal(of.b, 25.4)
+
+    # No effect
+    of.to_metric()
+    assert_equal(of.a, 2.54)
+    assert_equal(of.b, 25.4)
+
+
+def test_OFParamStmt_offset():
+    s = OFParamStmt('OF', 0, 0)
+    s.offset(1, 0)
+    assert_equal(s.a, 1.)
+    assert_equal(s.b, 0.)
+    s.offset(0, 1)
+    assert_equal(s.a, 1.)
+    assert_equal(s.b, 1.)
+
+
+def test_OFParamStmt_string():
+    """ Test OFParamStmt __str__
+    """
+    stmt = {'param': 'OF', 'a': '0.123456', 'b': '0.123456'}
     of = OFParamStmt.from_dict(stmt)
-    assert_equal(of.to_gerber(), '%OFA0.123456B0.123456*%')
+    assert_equal(str(of), '<Offset: X: 0.123456 Y: 0.123456 >')
+
+
+def test_SFParamStmt_factory():
+    stmt = {'param': 'SF', 'a': '1.4', 'b': '0.9'}
+    sf = SFParamStmt.from_dict(stmt)
+    assert_equal(sf.param, 'SF')
+    assert_equal(sf.a, 1.4)
+    assert_equal(sf.b, 0.9)
+
+
+def test_SFParamStmt_dump():
+    stmt = {'param': 'SF', 'a': '1.4', 'b': '0.9'}
+    sf = SFParamStmt.from_dict(stmt)
+    assert_equal(sf.to_gerber(), '%SFA1.4B0.9*%')
+
+
+def test_SFParamStmt_conversion():
+    stmt = {'param': 'OF', 'a': '2.54', 'b': '25.4'}
+    of = SFParamStmt.from_dict(stmt)
+    of.units = 'metric'
+    of.to_metric()
+
+    # No effect
+    assert_equal(of.a, 2.54)
+    assert_equal(of.b, 25.4)
+
+    of.to_inch()
+    assert_equal(of.units, 'inch')
+    assert_equal(of.a, 0.1)
+    assert_equal(of.b, 1.0)
+
+    # No effect
+    of.to_inch()
+    assert_equal(of.a, 0.1)
+    assert_equal(of.b, 1.0)
+
+    stmt = {'param': 'OF', 'a': '0.1', 'b': '1.0'}
+    of = SFParamStmt.from_dict(stmt)
+    of.units = 'inch'
+
+    # No effect
+    of.to_inch()
+    assert_equal(of.a, 0.1)
+    assert_equal(of.b, 1.0)
+
+    of.to_metric()
+    assert_equal(of.units, 'metric')
+    assert_equal(of.a, 2.54)
+    assert_equal(of.b, 25.4)
+
+    # No effect
+    of.to_metric()
+    assert_equal(of.a, 2.54)
+    assert_equal(of.b, 25.4)
+
+
+def test_SFParamStmt_offset():
+    s = SFParamStmt('OF', 0, 0)
+    s.offset(1, 0)
+    assert_equal(s.a, 1.)
+    assert_equal(s.b, 0.)
+    s.offset(0, 1)
+    assert_equal(s.a, 1.)
+    assert_equal(s.b, 1.)
+
+
+def test_SFParamStmt_string():
+    stmt = {'param': 'SF', 'a': '1.4', 'b': '0.9'}
+    sf = SFParamStmt.from_dict(stmt)
+    assert_equal(str(sf), '<Scale Factor: X: 1.4 Y: 0.9>')
 
 
 def test_LPParamStmt_factory():
@@ -159,6 +382,7 @@ def test_LPParamStmt_factory():
     lp = LPParamStmt.from_dict(stmt)
     assert_equal(lp.lp, 'dark')
 
+
 def test_LPParamStmt_dump():
     """ Test LPParamStmt to_gerber()
     """
@@ -171,6 +395,130 @@ def test_LPParamStmt_dump():
     assert_equal(lp.to_gerber(), '%LPD*%')
 
 
+def test_LPParamStmt_string():
+    """ Test LPParamStmt.__str__()
+    """
+    stmt = {'param': 'LP', 'lp': 'D'}
+    lp = LPParamStmt.from_dict(stmt)
+    assert_equal(str(lp), '<Level Polarity: dark>')
+
+    stmt = {'param': 'LP', 'lp': 'C'}
+    lp = LPParamStmt.from_dict(stmt)
+    assert_equal(str(lp), '<Level Polarity: clear>')
+
+
+def test_AMParamStmt_factory():
+    name = 'DONUTVAR'
+    macro = (
+'''0 Test Macro. *
+1,1,1.5,0,0*
+20,1,0.9,0,0.45,12,0.45,0*
+21,1,6.8,1.2,3.4,0.6,0*
+22,1,6.8,1.2,0,0,0*
+4,1,4,0.1,0.1,0.5,0.1,0.5,0.5,0.1,0.5,0.1,0.1,0*
+5,1,8,0,0,8,0*
+6,0,0,5,0.5,0.5,2,0.1,6,0*
+7,0,0,7,6,0.2,0*
+8,THIS IS AN UNSUPPORTED PRIMITIVE*
+''')
+    s = AMParamStmt.from_dict({'param': 'AM', 'name': name, 'macro': macro})
+    s.build()
+    assert_equal(len(s.primitives), 10)
+    assert_true(isinstance(s.primitives[0], AMCommentPrimitive))
+    assert_true(isinstance(s.primitives[1], AMCirclePrimitive))
+    assert_true(isinstance(s.primitives[2], AMVectorLinePrimitive))
+    assert_true(isinstance(s.primitives[3], AMCenterLinePrimitive))
+    assert_true(isinstance(s.primitives[4], AMLowerLeftLinePrimitive))
+    assert_true(isinstance(s.primitives[5], AMOutlinePrimitive))
+    assert_true(isinstance(s.primitives[6], AMPolygonPrimitive))
+    assert_true(isinstance(s.primitives[7], AMMoirePrimitive))
+    assert_true(isinstance(s.primitives[8], AMThermalPrimitive))
+    assert_true(isinstance(s.primitives[9], AMUnsupportPrimitive))
+
+
+def testAMParamStmt_conversion():
+    name = 'POLYGON'
+    macro = '5,1,8,25.4,25.4,25.4,0*'
+    s = AMParamStmt.from_dict({'param': 'AM', 'name': name, 'macro': macro})
+
+    s.build()
+    s.units = 'metric'
+
+    # No effect
+    s.to_metric()
+    assert_equal(s.primitives[0].position, (25.4, 25.4))
+    assert_equal(s.primitives[0].diameter, 25.4)
+
+    s.to_inch()
+    assert_equal(s.units, 'inch')
+    assert_equal(s.primitives[0].position, (1., 1.))
+    assert_equal(s.primitives[0].diameter, 1.)
+
+    # No effect
+    s.to_inch()
+    assert_equal(s.primitives[0].position, (1., 1.))
+    assert_equal(s.primitives[0].diameter, 1.)
+
+    macro = '5,1,8,1,1,1,0*'
+    s = AMParamStmt.from_dict({'param': 'AM', 'name': name, 'macro': macro})
+    s.build()
+    s.units = 'inch'
+
+    # No effect
+    s.to_inch()
+    assert_equal(s.primitives[0].position, (1., 1.))
+    assert_equal(s.primitives[0].diameter, 1.)
+
+    s.to_metric()
+    assert_equal(s.units, 'metric')
+    assert_equal(s.primitives[0].position, (25.4, 25.4))
+    assert_equal(s.primitives[0].diameter, 25.4)
+
+    # No effect
+    s.to_metric()
+    assert_equal(s.primitives[0].position, (25.4, 25.4))
+    assert_equal(s.primitives[0].diameter, 25.4)
+
+
+def test_AMParamStmt_dump():
+    name = 'POLYGON'
+    macro = '5,1,8,25.4,25.4,25.4,0.0'
+    s = AMParamStmt.from_dict({'param': 'AM', 'name': name, 'macro': macro})
+    s.build()
+    assert_equal(s.to_gerber(), '%AMPOLYGON*5,1,8,25.4,25.4,25.4,0.0*%')
+
+    s = AMParamStmt.from_dict({'param': 'AM', 'name': 'OC8', 'macro': '5,1,8,0,0,1.08239X$1,22.5'})
+    s.build()
+    assert_equal(s.to_gerber(), '%AMOC8*5,1,8,0,0,1.08239X$1,22.5*%')
+
+
+def test_AMParamStmt_string():
+    name = 'POLYGON'
+    macro = '5,1,8,25.4,25.4,25.4,0*'
+    s = AMParamStmt.from_dict({'param': 'AM', 'name': name, 'macro': macro})
+    s.build()
+    assert_equal(str(s), '<Aperture Macro POLYGON: 5,1,8,25.4,25.4,25.4,0*>')
+
+
+def test_ASParamStmt_factory():
+    stmt = {'param': 'AS', 'mode': 'AXBY'}
+    s = ASParamStmt.from_dict(stmt)
+    assert_equal(s.param, 'AS')
+    assert_equal(s.mode, 'AXBY')
+
+
+def test_ASParamStmt_dump():
+    stmt = {'param': 'AS', 'mode': 'AXBY'}
+    s = ASParamStmt.from_dict(stmt)
+    assert_equal(s.to_gerber(), '%ASAXBY*%')
+
+
+def test_ASParamStmt_string():
+    stmt = {'param': 'AS', 'mode': 'AXBY'}
+    s = ASParamStmt.from_dict(stmt)
+    assert_equal(str(s), '<Axis Select: AXBY>')
+
+
 def test_INParamStmt_factory():
     """ Test INParamStmt factory
     """
@@ -178,6 +526,7 @@ def test_INParamStmt_factory():
     inp = INParamStmt.from_dict(stmt)
     assert_equal(inp.name, 'test')
 
+
 def test_INParamStmt_dump():
     """ Test INParamStmt to_gerber()
     """
@@ -186,6 +535,12 @@ def test_INParamStmt_dump():
     assert_equal(inp.to_gerber(), '%INtest*%')
 
 
+def test_INParamStmt_string():
+    stmt = {'param': 'IN', 'name': 'test'}
+    inp = INParamStmt.from_dict(stmt)
+    assert_equal(str(inp), '<Image Name: test>')
+
+
 def test_LNParamStmt_factory():
     """ Test LNParamStmt factory
     """
@@ -193,6 +548,7 @@ def test_LNParamStmt_factory():
     lnp = LNParamStmt.from_dict(stmt)
     assert_equal(lnp.name, 'test')
 
+
 def test_LNParamStmt_dump():
     """ Test LNParamStmt to_gerber()
     """
@@ -200,6 +556,13 @@ def test_LNParamStmt_dump():
     lnp = LNParamStmt.from_dict(stmt)
     assert_equal(lnp.to_gerber(), '%LNtest*%')
 
+
+def test_LNParamStmt_string():
+    stmt = {'param': 'LN', 'name': 'test'}
+    lnp = LNParamStmt.from_dict(stmt)
+    assert_equal(str(lnp), '<Level Name: test>')
+
+
 def test_comment_stmt():
     """ Test comment statement
     """
@@ -207,6 +570,7 @@ def test_comment_stmt():
     assert_equal(stmt.type, 'COMMENT')
     assert_equal(stmt.comment, 'A comment')
 
+
 def test_comment_stmt_dump():
     """ Test CommentStmt to_gerber()
     """
@@ -214,12 +578,18 @@ def test_comment_stmt_dump():
     assert_equal(stmt.to_gerber(), 'G04A comment*')
 
 
+def test_comment_stmt_string():
+    stmt = CommentStmt('A comment')
+    assert_equal(str(stmt), '<Comment: A comment>')
+
+
 def test_eofstmt():
     """ Test EofStmt
     """
     stmt = EofStmt()
     assert_equal(stmt.type, 'EOF')
 
+
 def test_eofstmt_dump():
     """ Test EofStmt to_gerber()
     """
@@ -227,6 +597,10 @@ def test_eofstmt_dump():
     assert_equal(stmt.to_gerber(), 'M02*')
 
 
+def test_eofstmt_string():
+    assert_equal(str(EofStmt()), '<EOF Statement>')
+
+
 def test_quadmodestmt_factory():
     """ Test QuadrantModeStmt.from_gerber()
     """
@@ -239,6 +613,7 @@ def test_quadmodestmt_factory():
     stmt = QuadrantModeStmt.from_gerber(line)
     assert_equal(stmt.mode, 'multi-quadrant')
 
+
 def test_quadmodestmt_validation():
     """ Test QuadrantModeStmt input validation
     """
@@ -301,3 +676,275 @@ def test_unknownstmt_dump():
         stmt = UnknownStmt(line)
         assert_equal(stmt.to_gerber(), line)
 
+
+def test_statement_string():
+    """ Test Statement.__str__()
+    """
+    stmt = Statement('PARAM')
+    assert_in('type=PARAM', str(stmt))
+    stmt.test = 'PASS'
+    assert_in('test=PASS', str(stmt))
+    assert_in('type=PARAM', str(stmt))
+
+
+def test_ADParamStmt_factory():
+    """ Test ADParamStmt factory
+    """
+    stmt = {'param': 'AD', 'd': 0, 'shape': 'C'}
+    ad = ADParamStmt.from_dict(stmt)
+    assert_equal(ad.d, 0)
+    assert_equal(ad.shape, 'C')
+
+    stmt = {'param': 'AD', 'd': 1, 'shape': 'R'}
+    ad = ADParamStmt.from_dict(stmt)
+    assert_equal(ad.d, 1)
+    assert_equal(ad.shape, 'R')
+
+    stmt = {'param': 'AD', 'd': 1, 'shape': 'C', "modifiers": "1.42"}
+    ad = ADParamStmt.from_dict(stmt)
+    assert_equal(ad.d, 1)
+    assert_equal(ad.shape, 'C')
+    assert_equal(ad.modifiers, [(1.42,)])
+
+    stmt = {'param': 'AD', 'd': 1, 'shape': 'C', "modifiers": "1.42X"}
+    ad = ADParamStmt.from_dict(stmt)
+    assert_equal(ad.d, 1)
+    assert_equal(ad.shape, 'C')
+    assert_equal(ad.modifiers, [(1.42,)])
+
+    stmt = {'param': 'AD', 'd': 1, 'shape': 'R', "modifiers": "1.42X1.24"}
+    ad = ADParamStmt.from_dict(stmt)
+    assert_equal(ad.d, 1)
+    assert_equal(ad.shape, 'R')
+    assert_equal(ad.modifiers, [(1.42, 1.24)])
+
+
+def test_ADParamStmt_conversion():
+    stmt = {'param': 'AD', 'd': 0, 'shape': 'C',
+            'modifiers': '25.4X25.4,25.4X25.4'}
+    ad = ADParamStmt.from_dict(stmt)
+    ad.units = 'metric'
+
+    # No effect
+    ad.to_metric()
+    assert_equal(ad.modifiers[0], (25.4, 25.4))
+    assert_equal(ad.modifiers[1], (25.4, 25.4))
+
+    ad.to_inch()
+    assert_equal(ad.units, 'inch')
+    assert_equal(ad.modifiers[0], (1., 1.))
+    assert_equal(ad.modifiers[1], (1., 1.))
+
+    # No effect
+    ad.to_inch()
+    assert_equal(ad.modifiers[0], (1., 1.))
+    assert_equal(ad.modifiers[1], (1., 1.))
+
+    stmt = {'param': 'AD', 'd': 0, 'shape': 'C', 'modifiers': '1X1,1X1'}
+    ad = ADParamStmt.from_dict(stmt)
+    ad.units = 'inch'
+
+    # No effect
+    ad.to_inch()
+    assert_equal(ad.modifiers[0], (1., 1.))
+    assert_equal(ad.modifiers[1], (1., 1.))
+
+    ad.to_metric()
+    assert_equal(ad.modifiers[0], (25.4, 25.4))
+    assert_equal(ad.modifiers[1], (25.4, 25.4))
+
+    # No effect
+    ad.to_metric()
+    assert_equal(ad.modifiers[0], (25.4, 25.4))
+    assert_equal(ad.modifiers[1], (25.4, 25.4))
+
+
+def test_ADParamStmt_dump():
+    stmt = {'param': 'AD', 'd': 0, 'shape': 'C'}
+    ad = ADParamStmt.from_dict(stmt)
+    assert_equal(ad.to_gerber(), '%ADD0C*%')
+    stmt = {'param': 'AD', 'd': 0, 'shape': 'C', 'modifiers': '1X1,1X1'}
+    ad = ADParamStmt.from_dict(stmt)
+    assert_equal(ad.to_gerber(), '%ADD0C,1X1,1X1*%')
+
+
+def test_ADPamramStmt_string():
+    stmt = {'param': 'AD', 'd': 0, 'shape': 'C'}
+    ad = ADParamStmt.from_dict(stmt)
+    assert_equal(str(ad), '<Aperture Definition: 0: circle>')
+
+    stmt = {'param': 'AD', 'd': 0, 'shape': 'R'}
+    ad = ADParamStmt.from_dict(stmt)
+    assert_equal(str(ad), '<Aperture Definition: 0: rectangle>')
+
+    stmt = {'param': 'AD', 'd': 0, 'shape': 'O'}
+    ad = ADParamStmt.from_dict(stmt)
+    assert_equal(str(ad), '<Aperture Definition: 0: obround>')
+
+    stmt = {'param': 'AD', 'd': 0, 'shape': 'test'}
+    ad = ADParamStmt.from_dict(stmt)
+    assert_equal(str(ad), '<Aperture Definition: 0: test>')
+
+
+def test_MIParamStmt_factory():
+    stmt = {'param': 'MI', 'a': 1, 'b': 1}
+    mi = MIParamStmt.from_dict(stmt)
+    assert_equal(mi.a, 1)
+    assert_equal(mi.b, 1)
+
+
+def test_MIParamStmt_dump():
+    stmt = {'param': 'MI', 'a': 1, 'b': 1}
+    mi = MIParamStmt.from_dict(stmt)
+    assert_equal(mi.to_gerber(), '%MIA1B1*%')
+    stmt = {'param': 'MI', 'a': 1}
+    mi = MIParamStmt.from_dict(stmt)
+    assert_equal(mi.to_gerber(), '%MIA1B0*%')
+    stmt = {'param': 'MI', 'b': 1}
+    mi = MIParamStmt.from_dict(stmt)
+    assert_equal(mi.to_gerber(), '%MIA0B1*%')
+
+
+def test_MIParamStmt_string():
+    stmt = {'param': 'MI', 'a': 1, 'b': 1}
+    mi = MIParamStmt.from_dict(stmt)
+    assert_equal(str(mi), '<Image Mirror: A=1 B=1>')
+
+    stmt = {'param': 'MI', 'b': 1}
+    mi = MIParamStmt.from_dict(stmt)
+    assert_equal(str(mi), '<Image Mirror: A=0 B=1>')
+
+    stmt = {'param': 'MI', 'a': 1}
+    mi = MIParamStmt.from_dict(stmt)
+    assert_equal(str(mi), '<Image Mirror: A=1 B=0>')
+
+
+def test_coordstmt_ctor():
+    cs = CoordStmt('G04', 0.0, 0.1, 0.2, 0.3, 'D01', FileSettings())
+    assert_equal(cs.function, 'G04')
+    assert_equal(cs.x, 0.0)
+    assert_equal(cs.y, 0.1)
+    assert_equal(cs.i, 0.2)
+    assert_equal(cs.j, 0.3)
+    assert_equal(cs.op, 'D01')
+
+
+def test_coordstmt_factory():
+    stmt = {'function': 'G04', 'x': '0', 'y': '001',
+            'i': '002', 'j': '003', 'op': 'D01'}
+    cs = CoordStmt.from_dict(stmt, FileSettings())
+    assert_equal(cs.function, 'G04')
+    assert_equal(cs.x, 0.0)
+    assert_equal(cs.y, 0.1)
+    assert_equal(cs.i, 0.2)
+    assert_equal(cs.j, 0.3)
+    assert_equal(cs.op, 'D01')
+
+
+def test_coordstmt_dump():
+    cs = CoordStmt('G04', 0.0, 0.1, 0.2, 0.3, 'D01', FileSettings())
+    assert_equal(cs.to_gerber(FileSettings()), 'G04X0Y001I002J003D01*')
+
+
+def test_coordstmt_conversion():
+    cs = CoordStmt('G71', 25.4, 25.4, 25.4, 25.4, 'D01', FileSettings())
+    cs.units = 'metric'
+
+    # No effect
+    cs.to_metric()
+    assert_equal(cs.x, 25.4)
+    assert_equal(cs.y, 25.4)
+    assert_equal(cs.i, 25.4)
+    assert_equal(cs.j, 25.4)
+    assert_equal(cs.function, 'G71')
+
+    cs.to_inch()
+    assert_equal(cs.units, 'inch')
+    assert_equal(cs.x, 1.)
+    assert_equal(cs.y, 1.)
+    assert_equal(cs.i, 1.)
+    assert_equal(cs.j, 1.)
+    assert_equal(cs.function, 'G70')
+
+    # No effect
+    cs.to_inch()
+    assert_equal(cs.x, 1.)
+    assert_equal(cs.y, 1.)
+    assert_equal(cs.i, 1.)
+    assert_equal(cs.j, 1.)
+    assert_equal(cs.function, 'G70')
+
+    cs = CoordStmt('G70', 1., 1., 1., 1., 'D01', FileSettings())
+    cs.units = 'inch'
+
+    # No effect
+    cs.to_inch()
+    assert_equal(cs.x, 1.)
+    assert_equal(cs.y, 1.)
+    assert_equal(cs.i, 1.)
+    assert_equal(cs.j, 1.)
+    assert_equal(cs.function, 'G70')
+
+    cs.to_metric()
+    assert_equal(cs.x, 25.4)
+    assert_equal(cs.y, 25.4)
+    assert_equal(cs.i, 25.4)
+    assert_equal(cs.j, 25.4)
+    assert_equal(cs.function, 'G71')
+
+    # No effect
+    cs.to_metric()
+    assert_equal(cs.x, 25.4)
+    assert_equal(cs.y, 25.4)
+    assert_equal(cs.i, 25.4)
+    assert_equal(cs.j, 25.4)
+    assert_equal(cs.function, 'G71')
+
+
+def test_coordstmt_offset():
+    c = CoordStmt('G71', 0, 0, 0, 0, 'D01', FileSettings())
+    c.offset(1, 0)
+    assert_equal(c.x, 1.)
+    assert_equal(c.y, 0.)
+    assert_equal(c.i, 1.)
+    assert_equal(c.j, 0.)
+    c.offset(0, 1)
+    assert_equal(c.x, 1.)
+    assert_equal(c.y, 1.)
+    assert_equal(c.i, 1.)
+    assert_equal(c.j, 1.)
+
+
+def test_coordstmt_string():
+    cs = CoordStmt('G04', 0, 1, 2, 3, 'D01', FileSettings())
+    assert_equal(str(cs),
+                 '<Coordinate Statement: Fn: G04 X: 0 Y: 1 I: 2 J: 3 Op: Lights On>')
+    cs = CoordStmt('G04', None, None, None, None, 'D02', FileSettings())
+    assert_equal(str(cs), '<Coordinate Statement: Fn: G04 Op: Lights Off>')
+    cs = CoordStmt('G04', None, None, None, None, 'D03', FileSettings())
+    assert_equal(str(cs), '<Coordinate Statement: Fn: G04 Op: Flash>')
+    cs = CoordStmt('G04', None, None, None, None, 'TEST', FileSettings())
+    assert_equal(str(cs), '<Coordinate Statement: Fn: G04 Op: TEST>')
+
+
+def test_aperturestmt_ctor():
+    ast = ApertureStmt(3, False)
+    assert_equal(ast.d, 3)
+    assert_equal(ast.deprecated, False)
+    ast = ApertureStmt(4, True)
+    assert_equal(ast.d, 4)
+    assert_equal(ast.deprecated, True)
+    ast = ApertureStmt(4, 1)
+    assert_equal(ast.d, 4)
+    assert_equal(ast.deprecated, True)
+    ast = ApertureStmt(3)
+    assert_equal(ast.d, 3)
+    assert_equal(ast.deprecated, False)
+
+
+def test_aperturestmt_dump():
+    ast = ApertureStmt(3, False)
+    assert_equal(ast.to_gerber(), 'D3*')
+    ast = ApertureStmt(3, True)
+    assert_equal(ast.to_gerber(), 'G54D3*')
+    assert_equal(str(ast), '<Aperture: 3>')
diff --git a/gerber/tests/test_ipc356.py b/gerber/tests/test_ipc356.py
new file mode 100644
index 0000000..45bb01b
--- /dev/null
+++ b/gerber/tests/test_ipc356.py
@@ -0,0 +1,139 @@
+#! /usr/bin/env python
+# -*- coding: utf-8 -*-
+
+# Author: Hamilton Kibbe <ham@hamiltonkib.be>
+from ..ipc356 import *
+from ..cam import FileSettings
+from .tests import *
+
+import os
+
+IPC_D_356_FILE = os.path.join(os.path.dirname(__file__),
+                              'resources/ipc-d-356.ipc')
+
+
+def test_read():
+    ipcfile = read(IPC_D_356_FILE)
+    assert(isinstance(ipcfile, IPC_D_356))
+
+
+def test_parser():
+    ipcfile = read(IPC_D_356_FILE)
+    assert_equal(ipcfile.settings.units, 'inch')
+    assert_equal(ipcfile.settings.angle_units, 'degrees')
+    assert_equal(len(ipcfile.comments), 3)
+    assert_equal(len(ipcfile.parameters), 4)
+    assert_equal(len(ipcfile.test_records), 105)
+    assert_equal(len(ipcfile.components), 21)
+    assert_equal(len(ipcfile.vias), 14)
+    assert_equal(ipcfile.test_records[-1].net_name, 'A_REALLY_LONG_NET_NAME')
+    assert_equal(ipcfile.outlines[0].type, 'BOARD_EDGE')
+    assert_equal(set(ipcfile.outlines[0].points),
+                 {(0., 0.), (2.25, 0.), (2.25, 1.5), (0., 1.5), (0.13, 0.024)})
+
+
+def test_comment():
+    c = IPC356_Comment('Layer Stackup:')
+    assert_equal(c.comment, 'Layer Stackup:')
+    c = IPC356_Comment.from_line('C  Layer Stackup:   ')
+    assert_equal(c.comment, 'Layer Stackup:')
+    assert_raises(ValueError, IPC356_Comment.from_line, 'P  JOB')
+    assert_equal(str(c), '<IPC-D-356 Comment: Layer Stackup:>')
+
+
+def test_parameter():
+    p = IPC356_Parameter('VER', 'IPC-D-356A')
+    assert_equal(p.parameter, 'VER')
+    assert_equal(p.value, 'IPC-D-356A')
+    p = IPC356_Parameter.from_line('P  VER IPC-D-356A    ')
+    assert_equal(p.parameter, 'VER')
+    assert_equal(p.value, 'IPC-D-356A')
+    assert_raises(ValueError, IPC356_Parameter.from_line,
+                  'C  Layer Stackup:   ')
+    assert_equal(str(p), '<IPC-D-356 Parameter: VER=IPC-D-356A>')
+
+
+def test_eof():
+    e = IPC356_EndOfFile()
+    assert_equal(e.to_netlist(), '999')
+    assert_equal(str(e), '<IPC-D-356 EOF>')
+
+
+def test_outline():
+    type = 'BOARD_EDGE'
+    points = [(0.01, 0.01), (2., 2.), (4., 2.), (4., 6.)]
+    b = IPC356_Outline(type, points)
+    assert_equal(b.type, type)
+    assert_equal(b.points, points)
+    b = IPC356_Outline.from_line('389BOARD_EDGE         X100Y100 X20000Y20000 X40000 Y60000',
+                                 FileSettings(units='inch'))
+    assert_equal(b.type, 'BOARD_EDGE')
+    assert_equal(b.points, points)
+
+
+def test_test_record():
+    assert_raises(ValueError, IPC356_TestRecord.from_line,
+                  'P  JOB', FileSettings())
+    record_string = '317+5VDC            VIA   -     D0150PA00X 006647Y 012900X0000          S3'
+    r = IPC356_TestRecord.from_line(record_string, FileSettings(units='inch'))
+    assert_equal(r.feature_type, 'through-hole')
+    assert_equal(r.net_name, '+5VDC')
+    assert_equal(r.id, 'VIA')
+    assert_almost_equal(r.hole_diameter, 0.015)
+    assert_true(r.plated)
+    assert_equal(r.access, 'both')
+    assert_almost_equal(r.x_coord, 0.6647)
+    assert_almost_equal(r.y_coord, 1.29)
+    assert_equal(r.rect_x, 0.)
+    assert_equal(r.soldermask_info, 'both')
+    r = IPC356_TestRecord.from_line(record_string, FileSettings(units='metric'))
+    assert_almost_equal(r.hole_diameter, 0.15)
+    assert_almost_equal(r.x_coord, 6.647)
+    assert_almost_equal(r.y_coord, 12.9)
+    assert_equal(r.rect_x, 0.)
+    assert_equal(str(r), '<IPC-D-356 +5VDC Test Record: through-hole>')
+
+    record_string = '327+3.3VDC          R40   -1         PA01X 032100Y 007124X0236Y0315R180 S0'
+    r = IPC356_TestRecord.from_line(record_string, FileSettings(units='inch'))
+    assert_equal(r.feature_type, 'smt')
+    assert_equal(r.net_name, '+3.3VDC')
+    assert_equal(r.id, 'R40')
+    assert_equal(r.pin, '1')
+    assert_true(r.plated)
+    assert_equal(r.access, 'top')
+    assert_almost_equal(r.x_coord, 3.21)
+    assert_almost_equal(r.y_coord, 0.7124)
+    assert_almost_equal(r.rect_x, 0.0236)
+    assert_almost_equal(r.rect_y, 0.0315)
+    assert_equal(r.rect_rotation, 180)
+    assert_equal(r.soldermask_info, 'none')
+    r = IPC356_TestRecord.from_line(
+        record_string, FileSettings(units='metric'))
+    assert_almost_equal(r.x_coord, 32.1)
+    assert_almost_equal(r.y_coord, 7.124)
+    assert_almost_equal(r.rect_x, 0.236)
+    assert_almost_equal(r.rect_y, 0.315)
+
+    record_string = '317                 J4    -M2   D0330PA00X 012447Y 008030X0000          S1'
+    r = IPC356_TestRecord.from_line(record_string, FileSettings(units='inch'))
+    assert_equal(r.feature_type, 'through-hole')
+    assert_equal(r.id, 'J4')
+    assert_equal(r.pin, 'M2')
+    assert_almost_equal(r.hole_diameter, 0.033)
+    assert_true(r.plated)
+    assert_equal(r.access, 'both')
+    assert_almost_equal(r.x_coord, 1.2447)
+    assert_almost_equal(r.y_coord, 0.8030)
+    assert_almost_equal(r.rect_x, 0.)
+    assert_equal(r.soldermask_info, 'primary side')
+
+    record_string = '317SCL              COMMUNICATION-1    D  40PA00X  34000Y  20000X 600Y1200R270 '
+    r = IPC356_TestRecord.from_line(record_string, FileSettings(units='inch'))
+    assert_equal(r.feature_type, 'through-hole')
+    assert_equal(r.net_name, 'SCL')
+    assert_equal(r.id, 'COMMUNICATION')
+    assert_equal(r.pin, '1')
+    assert_almost_equal(r.hole_diameter, 0.004)
+    assert_true(r.plated)
+    assert_almost_equal(r.x_coord, 3.4)
+    assert_almost_equal(r.y_coord, 2.0)
diff --git a/gerber/tests/test_layers.py b/gerber/tests/test_layers.py
new file mode 100644
index 0000000..3f2bcfc
--- /dev/null
+++ b/gerber/tests/test_layers.py
@@ -0,0 +1,33 @@
+#! /usr/bin/env python
+# -*- coding: utf-8 -*-
+
+# Author: Hamilton Kibbe <ham@hamiltonkib.be>
+
+from .tests import *
+from ..layers import guess_layer_class, hints
+
+
+def test_guess_layer_class():
+    """ Test layer type inferred correctly from filename
+    """
+
+    # Add any specific test cases here (filename, layer_class)
+    test_vectors = [(None, 'unknown'), ('NCDRILL.TXT', 'unknown'),
+                    ('example_board.gtl', 'top'),
+                    ('exampmle_board.sst', 'topsilk'),
+                    ('ipc-d-356.ipc', 'ipc_netlist'), ]
+
+    for hint in hints:
+        for ext in hint.ext:
+            assert_equal(hint.layer, guess_layer_class('board.{}'.format(ext)))
+        for name in hint.name:
+            assert_equal(hint.layer, guess_layer_class('{}.pho'.format(name)))
+
+    for filename, layer_class in test_vectors:
+        assert_equal(layer_class, guess_layer_class(filename))
+
+
+def test_sort_layers():
+    """ Test layer ordering
+    """
+    pass
diff --git a/gerber/tests/test_primitives.py b/gerber/tests/test_primitives.py
new file mode 100644
index 0000000..c49b558
--- /dev/null
+++ b/gerber/tests/test_primitives.py
@@ -0,0 +1,1270 @@
+#! /usr/bin/env python
+# -*- coding: utf-8 -*-
+
+# Author: Hamilton Kibbe <ham@hamiltonkib.be>
+from operator import add
+
+from ..primitives import *
+from .tests import *
+
+
+def test_primitive_smoketest():
+    p = Primitive()
+    try:
+        p.bounding_box
+        assert_false(True, 'should have thrown the exception')
+    except NotImplementedError: 
+        pass
+    #assert_raises(NotImplementedError, p.bounding_box)
+
+    p.to_metric()
+    p.to_inch()
+    try:
+        p.offset(1, 1)
+        assert_false(True, 'should have thrown the exception')
+    except NotImplementedError:
+        pass
+
+
+def test_line_angle():
+    """ Test Line primitive angle calculation
+    """
+    cases = [((0, 0), (1, 0), math.radians(0)),
+             ((0, 0), (1, 1), math.radians(45)),
+             ((0, 0), (0, 1), math.radians(90)),
+             ((0, 0), (-1, 1), math.radians(135)),
+             ((0, 0), (-1, 0), math.radians(180)),
+             ((0, 0), (-1, -1), math.radians(225)),
+             ((0, 0), (0, -1), math.radians(270)),
+             ((0, 0), (1, -1), math.radians(315)), ]
+    for start, end, expected in cases:
+        l = Line(start, end, 0)
+        line_angle = (l.angle + 2 * math.pi) % (2 * math.pi)
+        assert_almost_equal(line_angle, expected)
+
+
+def test_line_bounds():
+    """ Test Line primitive bounding box calculation
+    """
+    cases = [((0, 0), (1, 1), ((-1, 2), (-1, 2))),
+             ((-1, -1), (1, 1), ((-2, 2), (-2, 2))),
+             ((1, 1), (-1, -1), ((-2, 2), (-2, 2))),
+             ((-1, 1), (1, -1), ((-2, 2), (-2, 2))), ]
+
+    c = Circle((0, 0), 2)
+    r = Rectangle((0, 0), 2, 2)
+    for shape in (c, r):
+        for start, end, expected in cases:
+            l = Line(start, end, shape)
+            assert_equal(l.bounding_box, expected)
+    # Test a non-square rectangle
+    r = Rectangle((0, 0), 3, 2)
+    cases = [((0, 0), (1, 1), ((-1.5, 2.5), (-1, 2))),
+             ((-1, -1), (1, 1), ((-2.5, 2.5), (-2, 2))),
+             ((1, 1), (-1, -1), ((-2.5, 2.5), (-2, 2))),
+             ((-1, 1), (1, -1), ((-2.5, 2.5), (-2, 2))), ]
+    for start, end, expected in cases:
+        l = Line(start, end, r)
+        assert_equal(l.bounding_box, expected)
+
+
+def test_line_vertices():
+    c = Circle((0, 0), 2)
+    l = Line((0, 0), (1, 1), c)
+    assert_equal(l.vertices, None)
+
+    # All 4 compass points, all 4 quadrants and the case where start == end
+    test_cases = [((0, 0), (1, 0), ((-1, -1), (-1, 1), (2, 1), (2, -1))),
+                  ((0, 0), (1, 1), ((-1, -1), (-1, 1),
+                                    (0, 2), (2, 2), (2, 0), (1, -1))),
+                  ((0, 0), (0, 1), ((-1, -1), (-1, 2), (1, 2), (1, -1))),
+                  ((0, 0), (-1, 1), ((-1, -1), (-2, 0),
+                                     (-2, 2), (0, 2), (1, 1), (1, -1))),
+                  ((0, 0), (-1, 0), ((-2, -1), (-2, 1), (1, 1), (1, -1))),
+                  ((0, 0), (-1, -1), ((-2, -2), (1, -1),
+                                      (1, 1), (-1, 1), (-2, 0), (0, -2))),
+                  ((0, 0), (0, -1), ((-1, -2), (-1, 1), (1, 1), (1, -2))),
+                  ((0, 0), (1, -1), ((-1, -1), (0, -2),
+                                     (2, -2), (2, 0), (1, 1), (-1, 1))),
+                  ((0, 0), (0, 0), ((-1, -1), (-1, 1), (1, 1), (1, -1))), ]
+    r = Rectangle((0, 0), 2, 2)
+
+    for start, end, vertices in test_cases:
+        l = Line(start, end, r)
+        assert_equal(set(vertices), set(l.vertices))
+
+
+def test_line_conversion():
+    c = Circle((0, 0), 25.4, units='metric')
+    l = Line((2.54, 25.4), (254.0, 2540.0), c, units='metric')
+
+    # No effect
+    l.to_metric()
+    assert_equal(l.start, (2.54, 25.4))
+    assert_equal(l.end, (254.0, 2540.0))
+    assert_equal(l.aperture.diameter, 25.4)
+
+    l.to_inch()
+    assert_equal(l.start, (0.1, 1.0))
+    assert_equal(l.end, (10.0, 100.0))
+    assert_equal(l.aperture.diameter, 1.0)
+
+    # No effect
+    l.to_inch()
+    assert_equal(l.start, (0.1, 1.0))
+    assert_equal(l.end, (10.0, 100.0))
+    assert_equal(l.aperture.diameter, 1.0)
+
+    c = Circle((0, 0), 1.0, units='inch')
+    l = Line((0.1, 1.0), (10.0, 100.0), c, units='inch')
+
+    # No effect
+    l.to_inch()
+    assert_equal(l.start, (0.1, 1.0))
+    assert_equal(l.end, (10.0, 100.0))
+    assert_equal(l.aperture.diameter, 1.0)
+
+    l.to_metric()
+    assert_equal(l.start, (2.54, 25.4))
+    assert_equal(l.end, (254.0, 2540.0))
+    assert_equal(l.aperture.diameter, 25.4)
+
+    # No effect
+    l.to_metric()
+    assert_equal(l.start, (2.54, 25.4))
+    assert_equal(l.end, (254.0, 2540.0))
+    assert_equal(l.aperture.diameter, 25.4)
+
+    r = Rectangle((0, 0), 25.4, 254.0, units='metric')
+    l = Line((2.54, 25.4), (254.0, 2540.0), r, units='metric')
+    l.to_inch()
+    assert_equal(l.start, (0.1, 1.0))
+    assert_equal(l.end, (10.0, 100.0))
+    assert_equal(l.aperture.width, 1.0)
+    assert_equal(l.aperture.height, 10.0)
+
+    r = Rectangle((0, 0), 1.0, 10.0, units='inch')
+    l = Line((0.1, 1.0), (10.0, 100.0), r, units='inch')
+    l.to_metric()
+    assert_equal(l.start, (2.54, 25.4))
+    assert_equal(l.end, (254.0, 2540.0))
+    assert_equal(l.aperture.width, 25.4)
+    assert_equal(l.aperture.height, 254.0)
+
+
+def test_line_offset():
+    c = Circle((0, 0), 1)
+    l = Line((0, 0), (1, 1), c)
+    l.offset(1, 0)
+    assert_equal(l.start, (1., 0.))
+    assert_equal(l.end, (2., 1.))
+    l.offset(0, 1)
+    assert_equal(l.start, (1., 1.))
+    assert_equal(l.end, (2., 2.))
+
+
+def test_arc_radius():
+    """ Test Arc primitive radius calculation
+    """
+    cases = [((-3, 4), (5, 0), (0, 0), 5),
+             ((0, 1), (1, 0), (0, 0), 1), ]
+
+    for start, end, center, radius in cases:
+        a = Arc(start, end, center, 'clockwise', 0, 'single-quadrant')
+        assert_equal(a.radius, radius)
+
+
+def test_arc_sweep_angle():
+    """ Test Arc primitive sweep angle calculation
+    """
+    cases = [((1, 0), (0, 1), (0, 0), 'counterclockwise', math.radians(90)),
+             ((1, 0), (0, 1), (0, 0), 'clockwise', math.radians(270)),
+             ((1, 0), (-1, 0), (0, 0), 'clockwise', math.radians(180)),
+             ((1, 0), (-1, 0), (0, 0), 'counterclockwise', math.radians(180)), ]
+
+    for start, end, center, direction, sweep in cases:
+        c = Circle((0,0), 1)
+        a = Arc(start, end, center, direction, c, 'single-quadrant')
+        assert_equal(a.sweep_angle, sweep)
+
+
+def test_arc_bounds():
+    """ Test Arc primitive bounding box calculation
+    """
+    cases = [((1, 0), (0, 1), (0, 0), 'clockwise', ((-1.5, 1.5), (-1.5, 1.5))),
+             ((1, 0), (0, 1), (0, 0), 'counterclockwise',
+              ((-0.5, 1.5), (-0.5, 1.5))),
+             # TODO: ADD MORE TEST CASES HERE
+             ]
+    for start, end, center, direction, bounds in cases:
+        c = Circle((0,0), 1)
+        a = Arc(start, end, center, direction, c, 'single-quadrant')
+        assert_equal(a.bounding_box, bounds)
+
+
+def test_arc_conversion():
+    c = Circle((0, 0), 25.4, units='metric')
+    a = Arc((2.54, 25.4), (254.0, 2540.0), (25400.0, 254000.0),
+            'clockwise', c, 'single-quadrant', units='metric')
+
+    # No effect
+    a.to_metric()
+    assert_equal(a.start, (2.54, 25.4))
+    assert_equal(a.end, (254.0, 2540.0))
+    assert_equal(a.center, (25400.0, 254000.0))
+    assert_equal(a.aperture.diameter, 25.4)
+
+    a.to_inch()
+    assert_equal(a.start, (0.1, 1.0))
+    assert_equal(a.end, (10.0, 100.0))
+    assert_equal(a.center, (1000.0, 10000.0))
+    assert_equal(a.aperture.diameter, 1.0)
+
+    # no effect
+    a.to_inch()
+    assert_equal(a.start, (0.1, 1.0))
+    assert_equal(a.end, (10.0, 100.0))
+    assert_equal(a.center, (1000.0, 10000.0))
+    assert_equal(a.aperture.diameter, 1.0)
+
+    c = Circle((0, 0), 1.0, units='inch')
+    a = Arc((0.1, 1.0), (10.0, 100.0), (1000.0, 10000.0),
+            'clockwise', c, 'single-quadrant', units='inch')
+    a.to_metric()
+    assert_equal(a.start, (2.54, 25.4))
+    assert_equal(a.end, (254.0, 2540.0))
+    assert_equal(a.center, (25400.0, 254000.0))
+    assert_equal(a.aperture.diameter, 25.4)
+
+
+def test_arc_offset():
+    c = Circle((0, 0), 1)
+    a = Arc((0, 0), (1, 1), (2, 2), 'clockwise', c, 'single-quadrant')
+    a.offset(1, 0)
+    assert_equal(a.start, (1., 0.))
+    assert_equal(a.end, (2., 1.))
+    assert_equal(a.center, (3., 2.))
+    a.offset(0, 1)
+    assert_equal(a.start, (1., 1.))
+    assert_equal(a.end, (2., 2.))
+    assert_equal(a.center, (3., 3.))
+
+
+def test_circle_radius():
+    """ Test Circle primitive radius calculation
+    """
+    c = Circle((1, 1), 2)
+    assert_equal(c.radius, 1)
+
+
+def test_circle_hole_radius():
+    """ Test Circle primitive hole radius calculation
+    """
+    c = Circle((1, 1), 4, 2)
+    assert_equal(c.hole_radius, 1)
+
+
+def test_circle_bounds():
+    """ Test Circle bounding box calculation
+    """
+    c = Circle((1, 1), 2)
+    assert_equal(c.bounding_box, ((0, 2), (0, 2)))
+
+
+def test_circle_conversion():
+    """Circle conversion of units"""
+    # Circle initially metric, no hole
+    c = Circle((2.54, 25.4), 254.0, units='metric')
+
+    c.to_metric()  # shouldn't do antyhing
+    assert_equal(c.position, (2.54, 25.4))
+    assert_equal(c.diameter, 254.)
+    assert_equal(c.hole_diameter, None)
+
+    c.to_inch()
+    assert_equal(c.position, (0.1, 1.))
+    assert_equal(c.diameter, 10.)
+    assert_equal(c.hole_diameter, None)
+
+    # no effect
+    c.to_inch()
+    assert_equal(c.position, (0.1, 1.))
+    assert_equal(c.diameter, 10.)
+    assert_equal(c.hole_diameter, None)
+    
+    # Circle initially metric, with hole
+    c = Circle((2.54, 25.4), 254.0, 127.0, units='metric')
+
+    c.to_metric()   #shouldn't do antyhing
+    assert_equal(c.position, (2.54, 25.4))
+    assert_equal(c.diameter, 254.)
+    assert_equal(c.hole_diameter, 127.)
+
+    c.to_inch()
+    assert_equal(c.position, (0.1, 1.))
+    assert_equal(c.diameter, 10.)
+    assert_equal(c.hole_diameter, 5.)
+
+    # no effect
+    c.to_inch()
+    assert_equal(c.position, (0.1, 1.))
+    assert_equal(c.diameter, 10.)
+    assert_equal(c.hole_diameter, 5.)
+    
+    # Circle initially inch, no hole
+    c = Circle((0.1, 1.0), 10.0, units='inch')
+    # No effect
+    c.to_inch()
+    assert_equal(c.position, (0.1, 1.))
+    assert_equal(c.diameter, 10.)
+    assert_equal(c.hole_diameter, None)
+
+    c.to_metric()
+    assert_equal(c.position, (2.54, 25.4))
+    assert_equal(c.diameter, 254.)
+    assert_equal(c.hole_diameter, None)
+
+    # no effect
+    c.to_metric()
+    assert_equal(c.position, (2.54, 25.4))
+    assert_equal(c.diameter, 254.)
+    assert_equal(c.hole_diameter, None)
+
+    c = Circle((0.1, 1.0), 10.0, 5.0, units='inch')
+    #No effect
+    c.to_inch()
+    assert_equal(c.position, (0.1, 1.))
+    assert_equal(c.diameter, 10.)
+    assert_equal(c.hole_diameter, 5.)
+
+    c.to_metric()
+    assert_equal(c.position, (2.54, 25.4))
+    assert_equal(c.diameter, 254.)
+    assert_equal(c.hole_diameter, 127.)
+
+    # no effect
+    c.to_metric()
+    assert_equal(c.position, (2.54, 25.4))
+    assert_equal(c.diameter, 254.)
+    assert_equal(c.hole_diameter, 127.)
+
+
+
+def test_circle_offset():
+    c = Circle((0, 0), 1)
+    c.offset(1, 0)
+    assert_equal(c.position, (1., 0.))
+    c.offset(0, 1)
+    assert_equal(c.position, (1., 1.))
+
+
+def test_ellipse_ctor():
+    """ Test ellipse creation
+    """
+    e = Ellipse((2, 2), 3, 2)
+    assert_equal(e.position, (2, 2))
+    assert_equal(e.width, 3)
+    assert_equal(e.height, 2)
+
+
+def test_ellipse_bounds():
+    """ Test ellipse bounding box calculation
+    """
+    e = Ellipse((2, 2), 4, 2)
+    assert_equal(e.bounding_box, ((0, 4), (1, 3)))
+    e = Ellipse((2, 2), 4, 2, rotation=90)
+    assert_equal(e.bounding_box, ((1, 3), (0, 4)))
+    e = Ellipse((2, 2), 4, 2, rotation=180)
+    assert_equal(e.bounding_box, ((0, 4), (1, 3)))
+    e = Ellipse((2, 2), 4, 2, rotation=270)
+    assert_equal(e.bounding_box, ((1, 3), (0, 4)))
+
+
+def test_ellipse_conversion():
+    e = Ellipse((2.54, 25.4), 254.0, 2540., units='metric')
+
+    # No effect
+    e.to_metric()
+    assert_equal(e.position, (2.54, 25.4))
+    assert_equal(e.width, 254.)
+    assert_equal(e.height, 2540.)
+
+    e.to_inch()
+    assert_equal(e.position, (0.1, 1.))
+    assert_equal(e.width, 10.)
+    assert_equal(e.height, 100.)
+
+    # No effect
+    e.to_inch()
+    assert_equal(e.position, (0.1, 1.))
+    assert_equal(e.width, 10.)
+    assert_equal(e.height, 100.)
+
+    e = Ellipse((0.1, 1.), 10.0, 100., units='inch')
+
+    # no effect
+    e.to_inch()
+    assert_equal(e.position, (0.1, 1.))
+    assert_equal(e.width, 10.)
+    assert_equal(e.height, 100.)
+
+    e.to_metric()
+    assert_equal(e.position, (2.54, 25.4))
+    assert_equal(e.width, 254.)
+    assert_equal(e.height, 2540.)
+
+    # No effect
+    e.to_metric()
+    assert_equal(e.position, (2.54, 25.4))
+    assert_equal(e.width, 254.)
+    assert_equal(e.height, 2540.)
+
+
+def test_ellipse_offset():
+    e = Ellipse((0, 0), 1, 2)
+    e.offset(1, 0)
+    assert_equal(e.position, (1., 0.))
+    e.offset(0, 1)
+    assert_equal(e.position, (1., 1.))
+
+
+def test_rectangle_ctor():
+    """ Test rectangle creation
+    """
+    test_cases = (((0, 0), 1, 1), ((0, 0), 1, 2), ((1, 1), 1, 2))
+    for pos, width, height in test_cases:
+        r = Rectangle(pos, width, height)
+        assert_equal(r.position, pos)
+        assert_equal(r.width, width)
+        assert_equal(r.height, height)
+        
+def test_rectangle_hole_radius():
+    """ Test rectangle hole diameter calculation
+    """
+    r = Rectangle((0,0), 2, 2)
+    assert_equal(0, r.hole_radius)
+    
+    r = Rectangle((0,0), 2, 2, 1)
+    assert_equal(0.5, r.hole_radius)
+
+
+
+def test_rectangle_bounds():
+    """ Test rectangle bounding box calculation
+    """
+    r = Rectangle((0, 0), 2, 2)
+    xbounds, ybounds = r.bounding_box
+    assert_array_almost_equal(xbounds, (-1, 1))
+    assert_array_almost_equal(ybounds, (-1, 1))
+    r = Rectangle((0, 0), 2, 2, rotation=45)
+    xbounds, ybounds = r.bounding_box
+    assert_array_almost_equal(xbounds, (-math.sqrt(2), math.sqrt(2)))
+    assert_array_almost_equal(ybounds, (-math.sqrt(2), math.sqrt(2)))
+
+
+def test_rectangle_conversion():
+    """Test converting rectangles between units"""
+    
+    # Initially metric no hole
+    r = Rectangle((2.54, 25.4), 254.0, 2540.0, units='metric')
+
+    r.to_metric()
+    assert_equal(r.position, (2.54, 25.4))
+    assert_equal(r.width, 254.0)
+    assert_equal(r.height, 2540.0)
+
+    r.to_inch()
+    assert_equal(r.position, (0.1, 1.0))
+    assert_equal(r.width, 10.0)
+    assert_equal(r.height, 100.0)
+
+    r.to_inch()
+    assert_equal(r.position, (0.1, 1.0))
+    assert_equal(r.width, 10.0)
+    assert_equal(r.height, 100.0)
+    
+    # Initially metric with hole
+    r = Rectangle((2.54, 25.4), 254.0, 2540.0, 127.0, units='metric')
+
+    r.to_metric()
+    assert_equal(r.position, (2.54,25.4))
+    assert_equal(r.width, 254.0)
+    assert_equal(r.height, 2540.0)
+    assert_equal(r.hole_diameter, 127.0)
+
+    r.to_inch()
+    assert_equal(r.position, (0.1, 1.0))
+    assert_equal(r.width, 10.0)
+    assert_equal(r.height, 100.0)
+    assert_equal(r.hole_diameter, 5.0)
+
+    r.to_inch()
+    assert_equal(r.position, (0.1, 1.0))
+    assert_equal(r.width, 10.0)
+    assert_equal(r.height, 100.0)
+    assert_equal(r.hole_diameter, 5.0)
+
+    # Initially inch, no hole
+    r = Rectangle((0.1, 1.0), 10.0, 100.0, units='inch')
+    r.to_inch()
+    assert_equal(r.position, (0.1, 1.0))
+    assert_equal(r.width, 10.0)
+    assert_equal(r.height, 100.0)
+
+    r.to_metric()
+    assert_equal(r.position, (2.54, 25.4))
+    assert_equal(r.width, 254.0)
+    assert_equal(r.height, 2540.0)
+
+    r.to_metric()
+    assert_equal(r.position, (2.54, 25.4))
+    assert_equal(r.width, 254.0)
+    assert_equal(r.height, 2540.0)
+    
+    # Initially inch with hole
+    r = Rectangle((0.1, 1.0), 10.0, 100.0, 5.0, units='inch')
+    r.to_inch()
+    assert_equal(r.position, (0.1, 1.0))
+    assert_equal(r.width, 10.0)
+    assert_equal(r.height, 100.0)
+    assert_equal(r.hole_diameter, 5.0)
+
+    r.to_metric()
+    assert_equal(r.position, (2.54,25.4))
+    assert_equal(r.width, 254.0)
+    assert_equal(r.height, 2540.0)
+    assert_equal(r.hole_diameter, 127.0)
+
+    r.to_metric()
+    assert_equal(r.position, (2.54, 25.4))
+    assert_equal(r.width, 254.0)
+    assert_equal(r.height, 2540.0)
+    assert_equal(r.hole_diameter, 127.0)
+
+
+def test_rectangle_offset():
+    r = Rectangle((0, 0), 1, 2)
+    r.offset(1, 0)
+    assert_equal(r.position, (1., 0.))
+    r.offset(0, 1)
+    assert_equal(r.position, (1., 1.))
+
+
+def test_diamond_ctor():
+    """ Test diamond creation
+    """
+    test_cases = (((0, 0), 1, 1), ((0, 0), 1, 2), ((1, 1), 1, 2))
+    for pos, width, height in test_cases:
+        d = Diamond(pos, width, height)
+        assert_equal(d.position, pos)
+        assert_equal(d.width, width)
+        assert_equal(d.height, height)
+
+
+def test_diamond_bounds():
+    """ Test diamond bounding box calculation
+    """
+    d = Diamond((0, 0), 2, 2)
+    xbounds, ybounds = d.bounding_box
+    assert_array_almost_equal(xbounds, (-1, 1))
+    assert_array_almost_equal(ybounds, (-1, 1))
+    d = Diamond((0, 0), math.sqrt(2), math.sqrt(2), rotation=45)
+    xbounds, ybounds = d.bounding_box
+    assert_array_almost_equal(xbounds, (-1, 1))
+    assert_array_almost_equal(ybounds, (-1, 1))
+
+
+def test_diamond_conversion():
+    d = Diamond((2.54, 25.4), 254.0, 2540.0, units='metric')
+
+    d.to_metric()
+    assert_equal(d.position, (2.54, 25.4))
+    assert_equal(d.width, 254.0)
+    assert_equal(d.height, 2540.0)
+
+    d.to_inch()
+    assert_equal(d.position, (0.1, 1.0))
+    assert_equal(d.width, 10.0)
+    assert_equal(d.height, 100.0)
+
+    d.to_inch()
+    assert_equal(d.position, (0.1, 1.0))
+    assert_equal(d.width, 10.0)
+    assert_equal(d.height, 100.0)
+
+    d = Diamond((0.1, 1.0), 10.0, 100.0, units='inch')
+
+    d.to_inch()
+    assert_equal(d.position, (0.1, 1.0))
+    assert_equal(d.width, 10.0)
+    assert_equal(d.height, 100.0)
+
+    d.to_metric()
+    assert_equal(d.position, (2.54, 25.4))
+    assert_equal(d.width, 254.0)
+    assert_equal(d.height, 2540.0)
+
+    d.to_metric()
+    assert_equal(d.position, (2.54, 25.4))
+    assert_equal(d.width, 254.0)
+    assert_equal(d.height, 2540.0)
+
+
+def test_diamond_offset():
+    d = Diamond((0, 0), 1, 2)
+    d.offset(1, 0)
+    assert_equal(d.position, (1., 0.))
+    d.offset(0, 1)
+    assert_equal(d.position, (1., 1.))
+
+
+def test_chamfer_rectangle_ctor():
+    """ Test chamfer rectangle creation
+    """
+    test_cases = (((0, 0), 1, 1, 0.2, (True, True, False, False)),
+                  ((0, 0), 1, 2, 0.3, (True, True, True, True)),
+                  ((1, 1), 1, 2, 0.4, (False, False, False, False)))
+    for pos, width, height, chamfer, corners in test_cases:
+        r = ChamferRectangle(pos, width, height, chamfer, corners)
+        assert_equal(r.position, pos)
+        assert_equal(r.width, width)
+        assert_equal(r.height, height)
+        assert_equal(r.chamfer, chamfer)
+        assert_array_almost_equal(r.corners, corners)
+
+
+def test_chamfer_rectangle_bounds():
+    """ Test chamfer rectangle bounding box calculation
+    """
+    r = ChamferRectangle((0, 0), 2, 2, 0.2, (True, True, False, False))
+    xbounds, ybounds = r.bounding_box
+    assert_array_almost_equal(xbounds, (-1, 1))
+    assert_array_almost_equal(ybounds, (-1, 1))
+    r = ChamferRectangle(
+        (0, 0), 2, 2, 0.2, (True, True, False, False), rotation=45)
+    xbounds, ybounds = r.bounding_box
+    assert_array_almost_equal(xbounds, (-math.sqrt(2), math.sqrt(2)))
+    assert_array_almost_equal(ybounds, (-math.sqrt(2), math.sqrt(2)))
+
+
+def test_chamfer_rectangle_conversion():
+    r = ChamferRectangle((2.54, 25.4), 254.0, 2540.0, 0.254,
+                         (True, True, False, False), units='metric')
+
+    r.to_metric()
+    assert_equal(r.position, (2.54, 25.4))
+    assert_equal(r.width, 254.0)
+    assert_equal(r.height, 2540.0)
+    assert_equal(r.chamfer, 0.254)
+
+    r.to_inch()
+    assert_equal(r.position, (0.1, 1.0))
+    assert_equal(r.width, 10.0)
+    assert_equal(r.height, 100.0)
+    assert_equal(r.chamfer, 0.01)
+
+    r.to_inch()
+    assert_equal(r.position, (0.1, 1.0))
+    assert_equal(r.width, 10.0)
+    assert_equal(r.height, 100.0)
+    assert_equal(r.chamfer, 0.01)
+
+    r = ChamferRectangle((0.1, 1.0), 10.0, 100.0, 0.01,
+                         (True, True, False, False), units='inch')
+    r.to_inch()
+    assert_equal(r.position, (0.1, 1.0))
+    assert_equal(r.width, 10.0)
+    assert_equal(r.height, 100.0)
+    assert_equal(r.chamfer, 0.01)
+
+    r.to_metric()
+    assert_equal(r.position, (2.54, 25.4))
+    assert_equal(r.width, 254.0)
+    assert_equal(r.height, 2540.0)
+    assert_equal(r.chamfer, 0.254)
+
+    r.to_metric()
+    assert_equal(r.position, (2.54, 25.4))
+    assert_equal(r.width, 254.0)
+    assert_equal(r.height, 2540.0)
+    assert_equal(r.chamfer, 0.254)
+
+
+def test_chamfer_rectangle_offset():
+    r = ChamferRectangle((0, 0), 1, 2, 0.01, (True, True, False, False))
+    r.offset(1, 0)
+    assert_equal(r.position, (1., 0.))
+    r.offset(0, 1)
+    assert_equal(r.position, (1., 1.))
+
+
+def test_round_rectangle_ctor():
+    """ Test round rectangle creation
+    """
+    test_cases = (((0, 0), 1, 1, 0.2, (True, True, False, False)),
+                  ((0, 0), 1, 2, 0.3, (True, True, True, True)),
+                  ((1, 1), 1, 2, 0.4, (False, False, False, False)))
+    for pos, width, height, radius, corners in test_cases:
+        r = RoundRectangle(pos, width, height, radius, corners)
+        assert_equal(r.position, pos)
+        assert_equal(r.width, width)
+        assert_equal(r.height, height)
+        assert_equal(r.radius, radius)
+        assert_array_almost_equal(r.corners, corners)
+
+
+def test_round_rectangle_bounds():
+    """ Test round rectangle bounding box calculation
+    """
+    r = RoundRectangle((0, 0), 2, 2, 0.2, (True, True, False, False))
+    xbounds, ybounds = r.bounding_box
+    assert_array_almost_equal(xbounds, (-1, 1))
+    assert_array_almost_equal(ybounds, (-1, 1))
+    r = RoundRectangle((0, 0), 2, 2, 0.2,
+                       (True, True, False, False), rotation=45)
+    xbounds, ybounds = r.bounding_box
+    assert_array_almost_equal(xbounds, (-math.sqrt(2), math.sqrt(2)))
+    assert_array_almost_equal(ybounds, (-math.sqrt(2), math.sqrt(2)))
+
+
+def test_round_rectangle_conversion():
+    r = RoundRectangle((2.54, 25.4), 254.0, 2540.0, 0.254,
+                       (True, True, False, False), units='metric')
+
+    r.to_metric()
+    assert_equal(r.position, (2.54, 25.4))
+    assert_equal(r.width, 254.0)
+    assert_equal(r.height, 2540.0)
+    assert_equal(r.radius, 0.254)
+
+    r.to_inch()
+    assert_equal(r.position, (0.1, 1.0))
+    assert_equal(r.width, 10.0)
+    assert_equal(r.height, 100.0)
+    assert_equal(r.radius, 0.01)
+
+    r.to_inch()
+    assert_equal(r.position, (0.1, 1.0))
+    assert_equal(r.width, 10.0)
+    assert_equal(r.height, 100.0)
+    assert_equal(r.radius, 0.01)
+
+    r = RoundRectangle((0.1, 1.0), 10.0, 100.0, 0.01,
+                       (True, True, False, False), units='inch')
+
+    r.to_inch()
+    assert_equal(r.position, (0.1, 1.0))
+    assert_equal(r.width, 10.0)
+    assert_equal(r.height, 100.0)
+    assert_equal(r.radius, 0.01)
+
+    r.to_metric()
+    assert_equal(r.position, (2.54, 25.4))
+    assert_equal(r.width, 254.0)
+    assert_equal(r.height, 2540.0)
+    assert_equal(r.radius, 0.254)
+
+    r.to_metric()
+    assert_equal(r.position, (2.54, 25.4))
+    assert_equal(r.width, 254.0)
+    assert_equal(r.height, 2540.0)
+    assert_equal(r.radius, 0.254)
+
+
+def test_round_rectangle_offset():
+    r = RoundRectangle((0, 0), 1, 2, 0.01, (True, True, False, False))
+    r.offset(1, 0)
+    assert_equal(r.position, (1., 0.))
+    r.offset(0, 1)
+    assert_equal(r.position, (1., 1.))
+
+
+def test_obround_ctor():
+    """ Test obround creation
+    """
+    test_cases = (((0, 0), 1, 1),
+                  ((0, 0), 1, 2),
+                  ((1, 1), 1, 2))
+    for pos, width, height in test_cases:
+        o = Obround(pos, width, height)
+        assert_equal(o.position, pos)
+        assert_equal(o.width, width)
+        assert_equal(o.height, height)
+
+
+def test_obround_bounds():
+    """ Test obround bounding box calculation
+    """
+    o = Obround((2, 2), 2, 4)
+    xbounds, ybounds = o.bounding_box
+    assert_array_almost_equal(xbounds, (1, 3))
+    assert_array_almost_equal(ybounds, (0, 4))
+    o = Obround((2, 2), 4, 2)
+    xbounds, ybounds = o.bounding_box
+    assert_array_almost_equal(xbounds, (0, 4))
+    assert_array_almost_equal(ybounds, (1, 3))
+
+
+def test_obround_orientation():
+    o = Obround((0, 0), 2, 1)
+    assert_equal(o.orientation, 'horizontal')
+    o = Obround((0, 0), 1, 2)
+    assert_equal(o.orientation, 'vertical')
+
+
+def test_obround_subshapes():
+    o = Obround((0, 0), 1, 4)
+    ss = o.subshapes
+    assert_array_almost_equal(ss['rectangle'].position, (0, 0))
+    assert_array_almost_equal(ss['circle1'].position, (0, 1.5))
+    assert_array_almost_equal(ss['circle2'].position, (0, -1.5))
+    o = Obround((0, 0), 4, 1)
+    ss = o.subshapes
+    assert_array_almost_equal(ss['rectangle'].position, (0, 0))
+    assert_array_almost_equal(ss['circle1'].position, (1.5, 0))
+    assert_array_almost_equal(ss['circle2'].position, (-1.5, 0))
+
+
+def test_obround_conversion():
+    o = Obround((2.54, 25.4), 254.0, 2540.0, units='metric')
+
+    # No effect
+    o.to_metric()
+    assert_equal(o.position, (2.54, 25.4))
+    assert_equal(o.width, 254.0)
+    assert_equal(o.height, 2540.0)
+
+    o.to_inch()
+    assert_equal(o.position, (0.1, 1.0))
+    assert_equal(o.width, 10.0)
+    assert_equal(o.height, 100.0)
+
+    # No effect
+    o.to_inch()
+    assert_equal(o.position, (0.1, 1.0))
+    assert_equal(o.width, 10.0)
+    assert_equal(o.height, 100.0)
+
+    o = Obround((0.1, 1.0), 10.0, 100.0, units='inch')
+
+    # No effect
+    o.to_inch()
+    assert_equal(o.position, (0.1, 1.0))
+    assert_equal(o.width, 10.0)
+    assert_equal(o.height, 100.0)
+
+    o.to_metric()
+    assert_equal(o.position, (2.54, 25.4))
+    assert_equal(o.width, 254.0)
+    assert_equal(o.height, 2540.0)
+
+    # No effect
+    o.to_metric()
+    assert_equal(o.position, (2.54, 25.4))
+    assert_equal(o.width, 254.0)
+    assert_equal(o.height, 2540.0)
+
+
+def test_obround_offset():
+    o = Obround((0, 0), 1, 2)
+    o.offset(1, 0)
+    assert_equal(o.position, (1., 0.))
+    o.offset(0, 1)
+    assert_equal(o.position, (1., 1.))
+
+
+def test_polygon_ctor():
+    """ Test polygon creation
+    """
+    test_cases = (((0, 0), 3, 5, 0),
+                  ((0, 0), 5, 6, 0),
+                  ((1, 1), 7, 7, 45))
+    for pos, sides, radius, hole_diameter in test_cases:
+        p = Polygon(pos, sides, radius, hole_diameter)
+        assert_equal(p.position, pos)
+        assert_equal(p.sides, sides)
+        assert_equal(p.radius, radius)
+        assert_equal(p.hole_diameter, hole_diameter)
+
+
+
+def test_polygon_bounds():
+    """ Test polygon bounding box calculation
+    """
+    p = Polygon((2, 2), 3, 2, 0)
+    xbounds, ybounds = p.bounding_box
+    assert_array_almost_equal(xbounds, (0, 4))
+    assert_array_almost_equal(ybounds, (0, 4))
+    p = Polygon((2, 2), 3, 4, 0)
+    xbounds, ybounds = p.bounding_box
+    assert_array_almost_equal(xbounds, (-2, 6))
+    assert_array_almost_equal(ybounds, (-2, 6))
+
+
+def test_polygon_conversion():
+    p = Polygon((2.54, 25.4), 3, 254.0, 0, units='metric')
+    
+    # No effect
+    p.to_metric()
+    assert_equal(p.position, (2.54, 25.4))
+    assert_equal(p.radius, 254.0)
+
+    p.to_inch()
+    assert_equal(p.position, (0.1, 1.0))
+    assert_equal(p.radius, 10.0)
+
+    # No effect
+    p.to_inch()
+    assert_equal(p.position, (0.1, 1.0))
+    assert_equal(p.radius, 10.0)
+
+    p = Polygon((0.1, 1.0), 3, 10.0, 0, units='inch')
+
+    # No effect
+    p.to_inch()
+    assert_equal(p.position, (0.1, 1.0))
+    assert_equal(p.radius, 10.0)
+
+    p.to_metric()
+    assert_equal(p.position, (2.54, 25.4))
+    assert_equal(p.radius, 254.0)
+
+    # No effect
+    p.to_metric()
+    assert_equal(p.position, (2.54, 25.4))
+    assert_equal(p.radius, 254.0)
+
+
+def test_polygon_offset():
+    p = Polygon((0, 0), 5, 10, 0)
+    p.offset(1, 0)
+    assert_equal(p.position, (1., 0.))
+    p.offset(0, 1)
+    assert_equal(p.position, (1., 1.))
+
+
+def test_region_ctor():
+    """ Test Region creation
+    """
+    apt = Circle((0, 0), 0)
+    lines = (Line((0, 0), (1, 0), apt), Line((1, 0), (1, 1), apt),
+             Line((1, 1), (0, 1), apt), Line((0, 1), (0, 0), apt))
+    points = ((0, 0), (1, 0), (1, 1), (0, 1))
+    r = Region(lines)
+    for i, p in enumerate(lines):
+        assert_equal(r.primitives[i], p)
+
+
+def test_region_bounds():
+    """ Test region bounding box calculation
+    """
+    apt = Circle((0, 0), 0)
+    lines = (Line((0, 0), (1, 0), apt), Line((1, 0), (1, 1), apt),
+             Line((1, 1), (0, 1), apt), Line((0, 1), (0, 0), apt))
+    r = Region(lines)
+    xbounds, ybounds = r.bounding_box
+    assert_array_almost_equal(xbounds, (0, 1))
+    assert_array_almost_equal(ybounds, (0, 1))
+
+
+def test_region_offset():
+    apt = Circle((0, 0), 0)
+    lines = (Line((0, 0), (1, 0), apt), Line((1, 0), (1, 1), apt),
+             Line((1, 1), (0, 1), apt), Line((0, 1), (0, 0), apt))
+    r = Region(lines)
+    xlim, ylim = r.bounding_box
+    r.offset(0, 1)
+    new_xlim, new_ylim = r.bounding_box
+    assert_array_almost_equal(new_xlim, xlim)
+    assert_array_almost_equal(new_ylim, tuple([y + 1 for y in ylim]))
+
+
+def test_round_butterfly_ctor():
+    """ Test round butterfly creation
+    """
+    test_cases = (((0, 0), 3), ((0, 0), 5), ((1, 1), 7))
+    for pos, diameter in test_cases:
+        b = RoundButterfly(pos, diameter)
+        assert_equal(b.position, pos)
+        assert_equal(b.diameter, diameter)
+        assert_equal(b.radius, diameter / 2.)
+
+
+def test_round_butterfly_ctor_validation():
+    """ Test RoundButterfly argument validation
+    """
+    assert_raises(TypeError, RoundButterfly, 3, 5)
+    assert_raises(TypeError, RoundButterfly, (3, 4, 5), 5)
+
+
+def test_round_butterfly_conversion():
+    b = RoundButterfly((2.54, 25.4), 254.0, units='metric')
+
+    # No Effect
+    b.to_metric()
+    assert_equal(b.position, (2.54, 25.4))
+    assert_equal(b.diameter, (254.0))
+
+    b.to_inch()
+    assert_equal(b.position, (0.1, 1.0))
+    assert_equal(b.diameter, 10.0)
+
+    # No effect
+    b.to_inch()
+    assert_equal(b.position, (0.1, 1.0))
+    assert_equal(b.diameter, 10.0)
+
+    b = RoundButterfly((0.1, 1.0), 10.0, units='inch')
+
+    # No effect
+    b.to_inch()
+    assert_equal(b.position, (0.1, 1.0))
+    assert_equal(b.diameter, 10.0)
+
+    b.to_metric()
+    assert_equal(b.position, (2.54, 25.4))
+    assert_equal(b.diameter, (254.0))
+
+    # No Effect
+    b.to_metric()
+    assert_equal(b.position, (2.54, 25.4))
+    assert_equal(b.diameter, (254.0))
+
+
+def test_round_butterfly_offset():
+    b = RoundButterfly((0, 0), 1)
+    b.offset(1, 0)
+    assert_equal(b.position, (1., 0.))
+    b.offset(0, 1)
+    assert_equal(b.position, (1., 1.))
+
+
+def test_round_butterfly_bounds():
+    """ Test RoundButterfly bounding box calculation
+    """
+    b = RoundButterfly((0, 0), 2)
+    xbounds, ybounds = b.bounding_box
+    assert_array_almost_equal(xbounds, (-1, 1))
+    assert_array_almost_equal(ybounds, (-1, 1))
+
+
+def test_square_butterfly_ctor():
+    """ Test SquareButterfly creation
+    """
+    test_cases = (((0, 0), 3), ((0, 0), 5), ((1, 1), 7))
+    for pos, side in test_cases:
+        b = SquareButterfly(pos, side)
+        assert_equal(b.position, pos)
+        assert_equal(b.side, side)
+
+
+def test_square_butterfly_ctor_validation():
+    """ Test SquareButterfly argument validation
+    """
+    assert_raises(TypeError, SquareButterfly, 3, 5)
+    assert_raises(TypeError, SquareButterfly, (3, 4, 5), 5)
+
+
+def test_square_butterfly_bounds():
+    """ Test SquareButterfly bounding box calculation
+    """
+    b = SquareButterfly((0, 0), 2)
+    xbounds, ybounds = b.bounding_box
+    assert_array_almost_equal(xbounds, (-1, 1))
+    assert_array_almost_equal(ybounds, (-1, 1))
+
+
+def test_squarebutterfly_conversion():
+    b = SquareButterfly((2.54, 25.4), 254.0, units='metric')
+
+    # No effect
+    b.to_metric()
+    assert_equal(b.position, (2.54, 25.4))
+    assert_equal(b.side, (254.0))
+
+    b.to_inch()
+    assert_equal(b.position, (0.1, 1.0))
+    assert_equal(b.side, 10.0)
+
+    # No effect
+    b.to_inch()
+    assert_equal(b.position, (0.1, 1.0))
+    assert_equal(b.side, 10.0)
+
+    b = SquareButterfly((0.1, 1.0), 10.0, units='inch')
+
+    # No effect
+    b.to_inch()
+    assert_equal(b.position, (0.1, 1.0))
+    assert_equal(b.side, 10.0)
+
+    b.to_metric()
+    assert_equal(b.position, (2.54, 25.4))
+    assert_equal(b.side, (254.0))
+
+    # No effect
+    b.to_metric()
+    assert_equal(b.position, (2.54, 25.4))
+    assert_equal(b.side, (254.0))
+
+
+def test_square_butterfly_offset():
+    b = SquareButterfly((0, 0), 1)
+    b.offset(1, 0)
+    assert_equal(b.position, (1., 0.))
+    b.offset(0, 1)
+    assert_equal(b.position, (1., 1.))
+
+
+def test_donut_ctor():
+    """ Test Donut primitive creation
+    """
+    test_cases = (((0, 0), 'round', 3, 5), ((0, 0), 'square', 5, 7),
+                  ((1, 1), 'hexagon', 7, 9), ((2, 2), 'octagon', 9, 11))
+    for pos, shape, in_d, out_d in test_cases:
+        d = Donut(pos, shape, in_d, out_d)
+        assert_equal(d.position, pos)
+        assert_equal(d.shape, shape)
+        assert_equal(d.inner_diameter, in_d)
+        assert_equal(d.outer_diameter, out_d)
+
+
+def test_donut_ctor_validation():
+    assert_raises(TypeError, Donut, 3, 'round', 5, 7)
+    assert_raises(TypeError, Donut, (3, 4, 5), 'round', 5, 7)
+    assert_raises(ValueError, Donut, (0, 0), 'triangle', 3, 5)
+    assert_raises(ValueError, Donut, (0, 0), 'round', 5, 3)
+
+
+def test_donut_bounds():
+    d = Donut((0, 0), 'round', 0.0, 2.0)
+    xbounds, ybounds = d.bounding_box
+    assert_equal(xbounds, (-1., 1.))
+    assert_equal(ybounds, (-1., 1.))
+
+
+def test_donut_conversion():
+    d = Donut((2.54, 25.4), 'round', 254.0, 2540.0, units='metric')
+
+    # No effect
+    d.to_metric()
+    assert_equal(d.position, (2.54, 25.4))
+    assert_equal(d.inner_diameter, 254.0)
+    assert_equal(d.outer_diameter, 2540.0)
+
+    d.to_inch()
+    assert_equal(d.position, (0.1, 1.0))
+    assert_equal(d.inner_diameter, 10.0)
+    assert_equal(d.outer_diameter, 100.0)
+
+    # No effect
+    d.to_inch()
+    assert_equal(d.position, (0.1, 1.0))
+    assert_equal(d.inner_diameter, 10.0)
+    assert_equal(d.outer_diameter, 100.0)
+
+    d = Donut((0.1, 1.0), 'round', 10.0, 100.0, units='inch')
+
+    # No effect
+    d.to_inch()
+    assert_equal(d.position, (0.1, 1.0))
+    assert_equal(d.inner_diameter, 10.0)
+    assert_equal(d.outer_diameter, 100.0)
+
+    d.to_metric()
+    assert_equal(d.position, (2.54, 25.4))
+    assert_equal(d.inner_diameter, 254.0)
+    assert_equal(d.outer_diameter, 2540.0)
+
+    # No effect
+    d.to_metric()
+    assert_equal(d.position, (2.54, 25.4))
+    assert_equal(d.inner_diameter, 254.0)
+    assert_equal(d.outer_diameter, 2540.0)
+
+
+def test_donut_offset():
+    d = Donut((0, 0), 'round', 1, 10)
+    d.offset(1, 0)
+    assert_equal(d.position, (1., 0.))
+    d.offset(0, 1)
+    assert_equal(d.position, (1., 1.))
+
+
+def test_drill_ctor():
+    """ Test drill primitive creation
+    """
+    test_cases = (((0, 0), 2), ((1, 1), 3), ((2, 2), 5))
+    for position, diameter in test_cases:
+        d = Drill(position, diameter, None)
+        assert_equal(d.position, position)
+        assert_equal(d.diameter, diameter)
+        assert_equal(d.radius, diameter / 2.)
+
+
+def test_drill_ctor_validation():
+    """ Test drill argument validation
+    """
+    assert_raises(TypeError, Drill, 3, 5, None)
+    assert_raises(TypeError, Drill, (3,4,5), 5, None)
+
+
+def test_drill_bounds():
+    d = Drill((0, 0), 2, None)
+    xbounds, ybounds = d.bounding_box
+    assert_array_almost_equal(xbounds, (-1, 1))
+    assert_array_almost_equal(ybounds, (-1, 1))
+    d = Drill((1, 2), 2, None)
+    xbounds, ybounds = d.bounding_box
+    assert_array_almost_equal(xbounds, (0, 2))
+    assert_array_almost_equal(ybounds, (1, 3))
+
+
+def test_drill_conversion():
+    d = Drill((2.54, 25.4), 254., None, units='metric')
+
+    # No effect
+    d.to_metric()
+    assert_equal(d.position, (2.54, 25.4))
+    assert_equal(d.diameter, 254.0)
+
+    d.to_inch()
+    assert_equal(d.position, (0.1, 1.0))
+    assert_equal(d.diameter, 10.0)
+
+    # No effect
+    d.to_inch()
+    assert_equal(d.position, (0.1, 1.0))
+    assert_equal(d.diameter, 10.0)
+
+    d = Drill((0.1, 1.0), 10., None, units='inch')
+
+    # No effect
+    d.to_inch()
+    assert_equal(d.position, (0.1, 1.0))
+    assert_equal(d.diameter, 10.0)
+
+    d.to_metric()
+    assert_equal(d.position, (2.54, 25.4))
+    assert_equal(d.diameter, 254.0)
+
+    # No effect
+    d.to_metric()
+    assert_equal(d.position, (2.54, 25.4))
+    assert_equal(d.diameter, 254.0)
+
+
+def test_drill_offset():
+    d = Drill((0, 0), 1., None)
+    d.offset(1, 0)
+    assert_equal(d.position, (1., 0.))
+    d.offset(0, 1)
+    assert_equal(d.position, (1., 1.))
+
+
+def test_drill_equality():
+    d = Drill((2.54, 25.4), 254., None)
+    d1 = Drill((2.54, 25.4), 254., None)
+    assert_equal(d, d1)
+    d1 = Drill((2.54, 25.4), 254.2, None)
+    assert_not_equal(d, d1)
diff --git a/gerber/tests/test_rs274x.py b/gerber/tests/test_rs274x.py
index f66a09e..d5acfe8 100644
--- a/gerber/tests/test_rs274x.py
+++ b/gerber/tests/test_rs274x.py
@@ -2,15 +2,55 @@
 # -*- coding: utf-8 -*-
 
 # Author: Hamilton Kibbe <ham@hamiltonkib.be>
+import os
+
 from ..rs274x import read, GerberFile
-from tests import *
+from .tests import *
 
-import os
 
 TOP_COPPER_FILE = os.path.join(os.path.dirname(__file__),
-                                'resources/top_copper.GTL')
+                               'resources/top_copper.GTL')
+
+MULTILINE_READ_FILE = os.path.join(os.path.dirname(__file__),
+                                   'resources/multiline_read.ger')
 
 
 def test_read():
     top_copper = read(TOP_COPPER_FILE)
     assert(isinstance(top_copper, GerberFile))
+
+
+def test_multiline_read():
+    multiline = read(MULTILINE_READ_FILE)
+    assert(isinstance(multiline, GerberFile))
+    assert_equal(10, len(multiline.statements))
+
+
+def test_comments_parameter():
+    top_copper = read(TOP_COPPER_FILE)
+    assert_equal(top_copper.comments[0], 'This is a comment,:')
+
+
+def test_size_parameter():
+    top_copper = read(TOP_COPPER_FILE)
+    size = top_copper.size
+    assert_almost_equal(size[0], 2.256900, 6)
+    assert_almost_equal(size[1], 1.500000, 6)
+
+
+def test_conversion():
+    import copy
+    top_copper = read(TOP_COPPER_FILE)
+    assert_equal(top_copper.units, 'inch')
+    top_copper_inch = copy.deepcopy(top_copper)
+    top_copper.to_metric()
+    for statement in top_copper_inch.statements:
+        statement.to_metric()
+    for primitive in top_copper_inch.primitives:
+        primitive.to_metric()
+    assert_equal(top_copper.units, 'metric')
+    for i, m in zip(top_copper.statements, top_copper_inch.statements):
+        assert_equal(i, m)
+
+    for i, m in zip(top_copper.primitives, top_copper_inch.primitives):
+        assert_equal(i, m)
diff --git a/gerber/tests/test_rs274x_backend.py b/gerber/tests/test_rs274x_backend.py
new file mode 100644
index 0000000..89512f0
--- /dev/null
+++ b/gerber/tests/test_rs274x_backend.py
@@ -0,0 +1,185 @@
+#! /usr/bin/env python
+# -*- coding: utf-8 -*-
+
+# Author: Garret Fick <garret@ficksworkshop.com>
+import io
+import os
+
+from ..render.rs274x_backend import Rs274xContext
+from ..rs274x import read
+from .tests import *
+
+def test_render_two_boxes():
+    """Umaco exapmle of two boxes"""
+    _test_render('resources/example_two_square_boxes.gbr', 'golden/example_two_square_boxes.gbr')
+
+
+def _test_render_single_quadrant():
+    """Umaco exapmle of a single quadrant arc"""
+    
+    # TODO there is probably a bug here
+    _test_render('resources/example_single_quadrant.gbr', 'golden/example_single_quadrant.gbr')
+
+
+def _test_render_simple_contour():
+    """Umaco exapmle of a simple arrow-shaped contour"""
+    _test_render('resources/example_simple_contour.gbr', 'golden/example_simple_contour.gbr')
+
+    
+def _test_render_single_contour_1():
+    """Umaco example of a single contour
+    
+    The resulting image for this test is used by other tests because they must generate the same output."""
+    _test_render('resources/example_single_contour_1.gbr', 'golden/example_single_contour.gbr')
+
+
+def _test_render_single_contour_2():
+    """Umaco exapmle of a single contour, alternate contour end order
+    
+    The resulting image for this test is used by other tests because they must generate the same output."""
+    _test_render('resources/example_single_contour_2.gbr', 'golden/example_single_contour.gbr')
+
+
+def _test_render_single_contour_3():
+    """Umaco exapmle of a single contour with extra line"""
+    _test_render('resources/example_single_contour_3.gbr', 'golden/example_single_contour_3.gbr')
+    
+    
+def _test_render_not_overlapping_contour():
+    """Umaco example of D02 staring a second contour"""
+    _test_render('resources/example_not_overlapping_contour.gbr', 'golden/example_not_overlapping_contour.gbr')
+    
+
+def _test_render_not_overlapping_touching():
+    """Umaco example of D02 staring a second contour"""
+    _test_render('resources/example_not_overlapping_touching.gbr', 'golden/example_not_overlapping_touching.gbr')
+
+
+def _test_render_overlapping_touching():
+    """Umaco example of D02 staring a second contour"""
+    _test_render('resources/example_overlapping_touching.gbr', 'golden/example_overlapping_touching.gbr')
+
+
+def _test_render_overlapping_contour():
+    """Umaco example of D02 staring a second contour"""
+    _test_render('resources/example_overlapping_contour.gbr', 'golden/example_overlapping_contour.gbr')
+
+
+def _DISABLED_test_render_level_holes():
+    """Umaco example of using multiple levels to create multiple holes"""
+    
+    # TODO This is clearly rendering wrong. I'm temporarily checking this in because there are more
+    # rendering fixes in the related repository that may resolve these.
+    _test_render('resources/example_level_holes.gbr', 'golden/example_overlapping_contour.gbr')
+
+
+def _DISABLED_test_render_cutin():
+    """Umaco example of using a cutin"""
+
+    # TODO This is clearly rendering wrong.
+    _test_render('resources/example_cutin.gbr', 'golden/example_cutin.gbr')
+
+
+def _test_render_fully_coincident():
+    """Umaco example of coincident lines rendering two contours"""
+
+    _test_render('resources/example_fully_coincident.gbr', 'golden/example_fully_coincident.gbr')
+
+
+def _test_render_coincident_hole():
+    """Umaco example of coincident lines rendering a hole in the contour"""
+
+    _test_render('resources/example_coincident_hole.gbr', 'golden/example_coincident_hole.gbr')
+
+
+def _test_render_cutin_multiple():
+    """Umaco example of a region with multiple cutins"""
+
+    _test_render('resources/example_cutin_multiple.gbr', 'golden/example_cutin_multiple.gbr')
+    
+
+def _test_flash_circle():
+    """Umaco example a simple circular flash with and without a hole"""
+
+    _test_render('resources/example_flash_circle.gbr', 'golden/example_flash_circle.gbr')
+
+
+def _test_flash_rectangle():
+    """Umaco example a simple rectangular flash with and without a hole"""
+
+    _test_render('resources/example_flash_rectangle.gbr', 'golden/example_flash_rectangle.gbr')
+
+
+def _test_flash_obround():
+    """Umaco example a simple obround flash with and without a hole"""
+
+    _test_render('resources/example_flash_obround.gbr', 'golden/example_flash_obround.gbr')
+
+
+def _test_flash_polygon():
+    """Umaco example a simple polygon flash with and without a hole"""
+
+    _test_render('resources/example_flash_polygon.gbr', 'golden/example_flash_polygon.gbr')
+
+
+def _test_holes_dont_clear():
+    """Umaco example that an aperture with a hole does not clear the area"""
+
+    _test_render('resources/example_holes_dont_clear.gbr', 'golden/example_holes_dont_clear.gbr')
+
+
+def _test_render_am_exposure_modifier():
+    """Umaco example that an aperture macro with a hole does not clear the area"""
+
+    _test_render('resources/example_am_exposure_modifier.gbr', 'golden/example_am_exposure_modifier.gbr')
+
+
+def _resolve_path(path):
+    return os.path.join(os.path.dirname(__file__),
+                                path)
+
+
+def _test_render(gerber_path, png_expected_path, create_output_path = None):
+    """Render the gerber file and compare to the expected PNG output.
+    
+    Parameters
+    ----------
+    gerber_path : string
+        Path to Gerber file to open
+    png_expected_path : string
+        Path to the PNG file to compare to
+    create_output : string|None
+        If not None, write the generated PNG to the specified path.
+        This is primarily to help with 
+    """
+    
+    gerber_path = _resolve_path(gerber_path)
+    png_expected_path = _resolve_path(png_expected_path)
+    if create_output_path:
+        create_output_path = _resolve_path(create_output_path)
+    
+    gerber = read(gerber_path)
+
+    # Create GBR output from the input file
+    ctx = Rs274xContext(gerber.settings)
+    gerber.render(ctx)
+
+    actual_contents = ctx.dump()
+    
+    # If we want to write the file bytes, do it now. This happens
+    if create_output_path:
+        with open(create_output_path, 'wb') as out_file:
+            out_file.write(actual_contents.getvalue())
+        # Creating the output is dangerous - it could overwrite the expected result.
+        # So if we are creating the output, we make the test fail on purpose so you
+        # won't forget to disable this
+        assert_false(True, 'Test created the output %s. This needs to be disabled to make sure the test behaves correctly' % (create_output_path,))
+    
+    # Read the expected PNG file
+    
+    with open(png_expected_path, 'r') as expected_file:
+        expected_contents = expected_file.read()
+    
+    assert_equal(expected_contents, actual_contents.getvalue())
+    
+    return gerber
diff --git a/gerber/tests/test_utils.py b/gerber/tests/test_utils.py
index 001a32f..35f6f47 100644
--- a/gerber/tests/test_utils.py
+++ b/gerber/tests/test_utils.py
@@ -3,8 +3,8 @@
 
 # Author: Hamilton Kibbe <ham@hamiltonkib.be>
 
-from .tests import assert_equal
-from ..utils import decimal_string, parse_gerber_value, write_gerber_value
+from .tests import assert_equal, assert_raises
+from ..utils import *
 
 
 def test_zero_suppression():
@@ -19,10 +19,11 @@ def test_zero_suppression():
                   ('1000', 0.01), ('10000', 0.1), ('100000', 1.0),
                   ('1000000', 10.0), ('-1', -0.00001), ('-10', -0.0001),
                   ('-100', -0.001), ('-1000', -0.01), ('-10000', -0.1),
-                  ('-100000', -1.0), ('-1000000', -10.0), ]
+                  ('-100000', -1.0), ('-1000000', -10.0),
+                  ('0', 0.0)]
     for string, value in test_cases:
-        assert(value == parse_gerber_value(string, fmt, zero_suppression))
-        assert(string == write_gerber_value(value, fmt, zero_suppression))
+        assert_equal(value, parse_gerber_value(string, fmt, zero_suppression))
+        assert_equal(string, write_gerber_value(value, fmt, zero_suppression))
 
     # Test trailing zero suppression
     zero_suppression = 'trailing'
@@ -30,10 +31,14 @@ def test_zero_suppression():
                   ('00001', 0.001), ('000001', 0.0001),
                   ('0000001', 0.00001), ('-1', -10.0), ('-01', -1.0),
                   ('-001', -0.1), ('-0001', -0.01), ('-00001', -0.001),
-                  ('-000001', -0.0001), ('-0000001', -0.00001)]
+                  ('-000001', -0.0001), ('-0000001', -0.00001),
+                  ('0', 0.0)]
     for string, value in test_cases:
-        assert(value == parse_gerber_value(string, fmt, zero_suppression))
-        assert(string == write_gerber_value(value, fmt, zero_suppression))
+        assert_equal(value, parse_gerber_value(string, fmt, zero_suppression))
+        assert_equal(string, write_gerber_value(value, fmt, zero_suppression))
+
+    assert_equal(write_gerber_value(0.000000001, fmt, 'leading'), '0')
+    assert_equal(write_gerber_value(0.000000001, fmt, 'trailing'), '0')
 
 
 def test_format():
@@ -46,10 +51,11 @@ def test_format():
                   ((2, 1), '1', 0.1), ((2, 7), '-1', -0.0000001),
                   ((2, 6), '-1', -0.000001), ((2, 5), '-1', -0.00001),
                   ((2, 4), '-1', -0.0001), ((2, 3), '-1', -0.001),
-                  ((2, 2), '-1', -0.01), ((2, 1), '-1', -0.1), ]
+                  ((2, 2), '-1', -0.01), ((2, 1), '-1', -0.1),
+                  ((2, 6), '0', 0)]
     for fmt, string, value in test_cases:
-        assert(value == parse_gerber_value(string, fmt, zero_suppression))
-        assert(string == write_gerber_value(value, fmt, zero_suppression))
+        assert_equal(value, parse_gerber_value(string, fmt, zero_suppression))
+        assert_equal(string, write_gerber_value(value, fmt, zero_suppression))
 
     zero_suppression = 'trailing'
     test_cases = [((6, 5), '1', 100000.0), ((5, 5), '1', 10000.0),
@@ -57,10 +63,11 @@ def test_format():
                   ((2, 5), '1', 10.0), ((1, 5), '1', 1.0),
                   ((6, 5), '-1', -100000.0), ((5, 5), '-1', -10000.0),
                   ((4, 5), '-1', -1000.0), ((3, 5), '-1', -100.0),
-                  ((2, 5), '-1', -10.0), ((1, 5), '-1', -1.0), ]
+                  ((2, 5), '-1', -10.0), ((1, 5), '-1', -1.0),
+                  ((2, 5), '0', 0)]
     for fmt, string, value in test_cases:
-        assert(value == parse_gerber_value(string, fmt, zero_suppression))
-        assert(string == write_gerber_value(value, fmt, zero_suppression))
+        assert_equal(value, parse_gerber_value(string, fmt, zero_suppression))
+        assert_equal(string, write_gerber_value(value, fmt, zero_suppression))
 
 
 def test_decimal_truncation():
@@ -69,8 +76,8 @@ def test_decimal_truncation():
     value = 1.123456789
     for x in range(10):
         result = decimal_string(value, precision=x)
-        calculated = '1.' + ''.join(str(y) for y in range(1,x+1))
-        assert(result == calculated)
+        calculated = '1.' + ''.join(str(y) for y in range(1, x + 1))
+        assert_equal(result, calculated)
 
 
 def test_decimal_padding():
@@ -81,3 +88,42 @@ def test_decimal_padding():
     assert_equal(decimal_string(value, precision=4, padding=True), '1.1230')
     assert_equal(decimal_string(value, precision=5, padding=True), '1.12300')
     assert_equal(decimal_string(value, precision=6, padding=True), '1.123000')
+    assert_equal(decimal_string(0, precision=6, padding=True), '0.000000')
+
+
+def test_parse_format_validation():
+    """ Test parse_gerber_value() format validation
+    """
+    assert_raises(ValueError, parse_gerber_value, '00001111', (7, 5))
+    assert_raises(ValueError, parse_gerber_value, '00001111', (5, 8))
+    assert_raises(ValueError, parse_gerber_value, '00001111', (13, 1))
+
+
+def test_write_format_validation():
+    """ Test write_gerber_value() format validation
+    """
+    assert_raises(ValueError, write_gerber_value, 69.0, (7, 5))
+    assert_raises(ValueError, write_gerber_value, 69.0, (5, 8))
+    assert_raises(ValueError, write_gerber_value, 69.0, (13, 1))
+
+
+def test_detect_format_with_short_file():
+    """ Verify file format detection works with short files
+    """
+    assert_equal('unknown', detect_file_format('gerber/tests/__init__.py'))
+
+
+def test_validate_coordinates():
+    assert_raises(TypeError, validate_coordinates, 3)
+    assert_raises(TypeError, validate_coordinates, 3.1)
+    assert_raises(TypeError, validate_coordinates, '14')
+    assert_raises(TypeError, validate_coordinates, (0,))
+    assert_raises(TypeError, validate_coordinates, (0, 1, 2))
+    assert_raises(TypeError, validate_coordinates, (0, 'string'))
+
+
+def test_convex_hull():
+    points = [(0, 0), (1, 0), (1, 1), (0.5, 0.5), (0, 1), (0, 0)]
+    expected = [(0, 0), (1, 0), (1, 1), (0, 1), (0, 0)]
+    assert_equal(set(convex_hull(points)), set(expected))
+    
\ No newline at end of file
diff --git a/gerber/tests/tests.py b/gerber/tests/tests.py
index 29b7899..ac08208 100644
--- a/gerber/tests/tests.py
+++ b/gerber/tests/tests.py
@@ -7,6 +7,7 @@ from nose.tools import assert_in
 from nose.tools import assert_not_in
 from nose.tools import assert_equal
 from nose.tools import assert_not_equal
+from nose.tools import assert_almost_equal
 from nose.tools import assert_true
 from nose.tools import assert_false
 from nose.tools import assert_raises
@@ -14,5 +15,11 @@ from nose.tools import raises
 from nose import with_setup
 
 __all__ = ['assert_in', 'assert_not_in', 'assert_equal', 'assert_not_equal',
-           'assert_true', 'assert_false', 'assert_raises', 'raises',
-           'with_setup' ]
+           'assert_almost_equal', 'assert_array_almost_equal', 'assert_true',
+           'assert_false', 'assert_raises', 'raises', 'with_setup']
+
+
+def assert_array_almost_equal(arr1, arr2, decimal=6):
+    assert_equal(len(arr1), len(arr2))
+    for i in range(len(arr1)):
+        assert_almost_equal(arr1[i], arr2[i], decimal)