expand test and fix many issues

41 files changed, 2634 insertions, 100 deletions

diff --git a/README.md b/README.md
index a2c309d..f992edf 100644
--- a/README.md
+++ b/README.md
@@ -98,7 +98,7 @@ In order to fill closed shape, ```DM_FILL``` has to be set to ```draw_mode``` pr
 import gerberex
 
 dxf = gerberex.read('outline.dxf')
-dxf.draw_mode = gerberex.DxfFile.DM_FILL
+dxf.draw_mode = dxf.DM_FILL
 dxf.write('outline.gml')
 ```
 
@@ -127,7 +127,7 @@ drill = gerberex.read('drill.txt')
 ctx.merge(drill)
 
 dxf = gerberex.read('mousebites.dxf')
-dxf.draw_mode = gerberex.DxfFile.DM_MOUSE_BITES
+dxf.draw_mode = dxf.DM_MOUSE_BITES
 dxf.to_metric()
 dxf.width = 0.5
 dxf.pitch = 1
diff --git a/gerberex/am_expression.py b/gerberex/am_expression.py
index 7aa95c8..b758df1 100644
--- a/gerberex/am_expression.py
+++ b/gerberex/am_expression.py
@@ -49,7 +49,7 @@ class AMConstantExpression(AMExpression):
         return self
     
     def to_gerber(self, settings=None):
-        return str(self._value)
+        return '%.6g' % self._value
 
     def to_instructions(self):
         return [(OpCode.PUSH, self._value)]
@@ -179,5 +179,3 @@ def eval_macro(instructions):
         elif opcode == OpCode.PRIM:
             yield (argument, stack)
             stack = []
-
-
diff --git a/gerberex/am_primitive.py b/gerberex/am_primitive.py
index 82370f6..df55573 100644
--- a/gerberex/am_primitive.py
+++ b/gerberex/am_primitive.py
@@ -117,14 +117,14 @@ class AMVectorLinePrimitiveDef(AMPrimitiveDef):
         self.start_x = self.start_x.to_inch().optimize()
         self.start_y = self.start_y.to_inch().optimize()
         self.end_x = self.end_x.to_inch().optimize()
-        self.end_y = self.end_x.to_inch().optimize()
+        self.end_y = self.end_y.to_inch().optimize()
     
     def to_metric(self):
         self.width = self.width.to_metric().optimize()
         self.start_x = self.start_x.to_metric().optimize()
         self.start_y = self.start_y.to_metric().optimize()
         self.end_x = self.end_x.to_metric().optimize()
-        self.end_y = self.end_x.to_metric().optimize()
+        self.end_y = self.end_y.to_metric().optimize()
 
     def to_gerber(self, settings=None):
         data = dict(code = self.code,
@@ -197,11 +197,11 @@ class AMCenterLinePrimitiveDef(AMPrimitiveDef):
 class AMOutlinePrimitiveDef(AMPrimitiveDef):
     @classmethod
     def from_modifiers(cls, code, modifiers):
-        num_points = modifiers[1] + 1
+        num_points = int(modifiers[1].value + 1)
         code = code
         exposure = 'on' if modifiers[0].value == 1 else 'off'
-        addrs = modifiers[2:num_points * 2]
-        rotation = modifiers[3 + num_points * 2]
+        addrs = modifiers[2:num_points * 2 + 2]
+        rotation = modifiers[2 + num_points * 2]
         return cls(code, exposure, addrs, rotation)
 
     def __init__(self, code, exposure, addrs, rotation):
@@ -209,10 +209,10 @@ class AMOutlinePrimitiveDef(AMPrimitiveDef):
         self.addrs = addrs
 
     def to_inch(self):
-        self.addrs = [i.to_inch() for i in self.addrs]
+        self.addrs = [i.to_inch().optimize() for i in self.addrs]
     
     def to_metric(self):
-        self.addrs = [i.to_metric() for i in self.addrs]
+        self.addrs = [i.to_metric().optimize() for i in self.addrs]
  
     def to_gerber(self, settings=None):
         def strs():
@@ -262,7 +262,7 @@ class AMPolygonPrimitiveDef(AMPrimitiveDef):
     def to_metric(self):
         self.x = self.x.to_metric().optimize()
         self.y = self.y.to_metric().optimize()
-        self.diameter = self.diameter.to_inch().optimize()
+        self.diameter = self.diameter.to_metric().optimize()
 
     def to_gerber(self, settings=None):
         data = dict(code = self.code,
diff --git a/gerberex/composition.py b/gerberex/composition.py
index 73f5702..7abf090 100644
--- a/gerberex/composition.py
+++ b/gerberex/composition.py
@@ -202,8 +202,8 @@ class DrillComposition(Composition):
                 file.to_inch()
 
         if not self.header1_statements:
-            self.header1_statements = file.header
-            self.header2_statements = file.header2
+            self.header1_statements = [file.header]
+            self.header2_statements = [file.header2]
         
         tool = self._register_tool(ExcellonTool(self.settings, number=1, diameter=file.width))
         self.dxf_statements.append((tool.number, file.statements))
diff --git a/gerberex/excellon.py b/gerberex/excellon.py
index 90d6742..b72b95b 100644
--- a/gerberex/excellon.py
+++ b/gerberex/excellon.py
@@ -6,6 +6,7 @@
 from gerber.excellon import (ExcellonParser, detect_excellon_format, ExcellonFile)
 from gerber.excellon_statements import UnitStmt
 from gerber.cam import FileSettings
+from gerber.utils import inch, metric
 from gerberex.utility import rotate
 
 def loads(data, filename=None, settings=None, tools=None, format=None):
@@ -33,6 +34,19 @@ class ExcellonFileEx(ExcellonFile):
             return
         for hit in self.hits:
             hit.position = rotate(hit.position[0], hit.position[1], angle, center)
+    
+    def to_inch(self):
+        if self.units == 'metric':
+            super(ExcellonFileEx, self).to_inch()
+            for hit in self.hits:
+                hit.position = (inch(hit.position[0]), inch(hit.position[1]))
+
+    def to_metric(self):
+        if self.units == 'inch':
+            super(ExcellonFileEx, self).to_metric()
+            for hit in self.hits:
+                hit.position = (metric(hit.position[0]), metric(hit.position[1]))
+
 
 class UnitStmtEx(UnitStmt):
     @classmethod
@@ -43,7 +57,8 @@ class UnitStmtEx(UnitStmt):
         super(UnitStmtEx, self).__init__(units, zeros, format, **kwargs)
     
     def to_excellon(self, settings=None):
+        format = settings.format if settings else self.format
         stmt = '%s,%s,%s.%s' % ('INCH' if self.units == 'inch' else 'METRIC',
                           'LZ' if self.zeros == 'leading' else 'TZ',
-                          '0' * self.format[0], '0' * self.format[1])
+                          '0' * format[0], '0' * format[1])
         return stmt
diff --git a/gerberex/gerber_statements.py b/gerberex/gerber_statements.py
new file mode 100644
index 0000000..c2eb565
--- /dev/null
+++ b/gerberex/gerber_statements.py
@@ -0,0 +1,115 @@
+#!/usr/bin/env python
+# -*- coding: utf-8 -*-
+
+# Copyright 2019 Hiroshi Murayama <opiopan@gmail.com>
+
+from gerber.gerber_statements import AMParamStmt, ADParamStmt
+from gerber.utils import inch, metric
+from gerberex.am_primitive import to_primitive_defs
+
+class AMParamStmtEx(AMParamStmt):
+    @classmethod
+    def from_stmt(cls, stmt):
+        return cls(stmt.param, stmt.name, stmt.macro, stmt.units)
+
+    @classmethod
+    def circle(cls, name, units):
+        return cls('AM', name, '1,1,$1,0,0,0*1,0,$2,0,0,0', units)
+
+    @classmethod
+    def rectangle(cls, name, units):
+        return cls('AM', name, '21,1,$1,$2,0,0,0*1,0,$3,0,0,0', units)
+    
+    @classmethod
+    def landscape_obround(cls, name, units):
+        return cls(
+            'AM', name,
+            '$4=$1-$2*'
+            '$5=$1-$4*'
+            '21,1,$5,$2,0,0,0*'
+            '1,1,$4,$4/2,0,0*'
+            '1,1,$4,-$4/2,0,0*'
+            '1,0,$3,0,0,0', units)
+
+    @classmethod
+    def portrate_obround(cls, name, units):
+        return cls(
+            'AM', name,
+            '$4=$2-$1*'
+            '$5=$2-$4*'
+            '21,1,$1,$5,0,0,0*'
+            '1,1,$4,0,$4/2,0*'
+            '1,1,$4,0,-$4/2,0*'
+            '1,0,$3,0,0,0', units)
+    
+    @classmethod
+    def polygon(cls, name, units):
+        return cls('AM', name, '5,1,$2,0,0,$1,$3*1,0,$4,0,0,0', units)
+
+    def __init__(self, param, name, macro, units):
+        super(AMParamStmtEx, self).__init__(param, name, macro)
+        self.units = units
+        self.primitive_defs = list(to_primitive_defs(self.instructions))
+    
+    def to_inch(self):
+        if self.units == 'metric':
+            self.units = 'inch'
+            for p in self.primitive_defs:
+                p.to_inch()
+
+    def to_metric(self):
+        if self.units == 'inch':
+            self.units = 'metric'
+            for p in self.primitive_defs:
+                p.to_metric()
+
+    def to_gerber(self, settings = None):
+        def plist():
+            for p in self.primitive_defs:
+                yield p.to_gerber(settings)
+        return "%%AM%s*\n%s%%" % (self.name, '\n'.join(plist()))
+
+    def rotate(self, angle, center=None):
+        for primitive_def in self.primitive_defs:
+            primitive_def.rotate(angle, center)
+
+class ADParamStmtEx(ADParamStmt):
+    GEOMETRIES = {
+        'C': [0,1],
+        'R': [0,1,2],
+        'O': [0,1,2],
+        'P': [0,3],
+    }
+
+    @classmethod
+    def from_stmt(cls, stmt):
+        modstr = ','.join([
+            'X'.join(['{0}'.format(x) for x in modifier])
+        for modifier in stmt.modifiers])
+        return cls(stmt.param, stmt.d, stmt.shape, modstr, stmt.units)
+
+    def __init__(self, param, d, shape, modifiers, units):
+        super(ADParamStmtEx, self).__init__(param, d, shape, modifiers)
+        self.units = units
+
+    def to_inch(self):
+        if self.units == 'inch':
+            return
+        self.units = 'inch'
+        if self.shape in self.GEOMETRIES:
+            indices = self.GEOMETRIES[self.shape]
+            self.modifiers = [tuple([
+                inch(self.modifiers[0][i]) if i in indices else self.modifiers[0][i] \
+                    for i in range(len(self.modifiers[0]))
+            ])]
+
+    def to_metric(self):
+        if self.units == 'metric':
+            return
+        self.units = 'metric'
+        if self.shape in self.GEOMETRIES:
+            indices = self.GEOMETRIES[self.shape]
+            self.modifiers = [tuple([
+                metric(self.modifiers[0][i]) if i in indices else self.modifiers[0][i] \
+                    for i in range(len(self.modifiers[0]))
+            ])]
diff --git a/gerberex/rs274x.py b/gerberex/rs274x.py
index 4eb317d..13d3421 100644
--- a/gerberex/rs274x.py
+++ b/gerberex/rs274x.py
@@ -5,7 +5,7 @@
 
 import gerber.rs274x
 from gerber.gerber_statements import ADParamStmt, CoordStmt
-from gerberex.statements import AMParamStmt, AMParamStmtEx
+from gerberex.gerber_statements import AMParamStmt, AMParamStmtEx, ADParamStmtEx
 from gerberex.utility import rotate
 
 class GerberFile(gerber.rs274x.GerberFile):
@@ -17,6 +17,8 @@ class GerberFile(gerber.rs274x.GerberFile):
         def swap_statement(statement):
             if isinstance(statement, AMParamStmt) and not isinstance(statement, AMParamStmtEx):
                 return AMParamStmtEx.from_stmt(statement)
+            elif isinstance(statement, ADParamStmt) and not isinstance(statement, AMParamStmtEx):
+                return ADParamStmtEx.from_stmt(statement)
             else:
                 return statement
         statements = [swap_statement(statement) for statement in gerber_file.statements]
@@ -26,6 +28,18 @@ class GerberFile(gerber.rs274x.GerberFile):
     def __init__(self, statements, settings, primitives, apertures, filename=None):
         super(GerberFile, self).__init__(statements, settings, primitives, apertures, filename)
 
+    def offset(self, x_offset=0, y_offset=0):
+        for statement in self.statements:
+            if isinstance(statement, CoordStmt):
+                if statement.x is not None:
+                    statement.x += x_offset
+                if statement.y is not None:
+                    statement.y += y_offset
+            else:
+                statement.offset(x_offset, y_offset)
+        for primitive in self.primitives:
+            primitive.offset(x_offset, y_offset)
+
     def rotate(self, angle, center=(0,0)):
         if angle % 360 == 0:
             return
@@ -84,7 +98,7 @@ class GerberFile(gerber.rs274x.GerberFile):
                 while name in macros:
                     name = '%s_%d' % (macro_def[0], num)
                     num += 1
-                self.statements.insert(insert_point, macro_def[1](name))
+                self.statements.insert(insert_point, macro_def[1](name, self.units))
                 macro_defs[idx] = (name, macro_def[1])
             for idx in range(insert_point, last_aperture + len(macro_defs) + 1):
                 statement = self.statements[idx]
@@ -92,10 +106,10 @@ class GerberFile(gerber.rs274x.GerberFile):
                     if statement.shape == 'R':
                         statement.shape = macro_defs[RECTANGLE][0]
                     elif statement.shape == 'O':
-                        x = statement.modifiers[0] \
-                            if len(statement.modifiers) > 0 else 0
-                        y = statement.modifiers[1] \
-                            if len(statement.modifiers) > 1 else 0
+                        x = statement.modifiers[0][0] \
+                            if len(statement.modifiers[0]) > 0 else 0
+                        y = statement.modifiers[0][1] \
+                            if len(statement.modifiers[0]) > 1 else 0
                         statement.shape = macro_defs[LANDSCAPE_OBROUND][0] \
                                           if x > y else macro_defs[PORTRATE_OBROUND][0] 
                     elif statement.shape == 'P':
diff --git a/gerberex/statements.py b/gerberex/statements.py
deleted file mode 100644
index c41acb9..0000000
--- a/gerberex/statements.py
+++ /dev/null
@@ -1,70 +0,0 @@
-#!/usr/bin/env python
-# -*- coding: utf-8 -*-
-
-# Copyright 2019 Hiroshi Murayama <opiopan@gmail.com>
-
-from gerber.gerber_statements import AMParamStmt
-from gerberex.am_primitive import to_primitive_defs
-
-class AMParamStmtEx(AMParamStmt):
-    @classmethod
-    def from_stmt(cls, stmt):
-        return cls(stmt.param, stmt.name, stmt.macro)
-
-    @classmethod
-    def circle(cls, name):
-        return cls('AM', name, '1,1,$1,0,0,0*1,0,$2,0,0,0')
-
-    @classmethod
-    def rectangle(cls, name):
-        return cls('AM', name, '21,1,$1,$2,0,0,0*1,0,$3,0,0,0')
-    
-    @classmethod
-    def landscape_obround(cls, name):
-        return cls(
-            'AM', name,
-            '$4=$1-$2*'
-            '21,1,$1-$4,$2,0,0,0*'
-            '1,1,$4,$4/2,0,0*'
-            '1,1,$4,-$4/2,0,0*'
-            '1,0,$3,0,0,0')
-
-    @classmethod
-    def portrate_obround(cls, name):
-        return cls(
-            'AM', name,
-            '$4=$2-$1*'
-            '21,1,$1,$2-$4,0,0,0*'
-            '1,1,$4,0,$4/2,0*'
-            '1,1,$4,0,-$4/2,0*'
-            '1,0,$3,0,0,0')
-    
-    @classmethod
-    def polygon(cls, name):
-        return cls('AM', name, '5,1,$2,0,0,$1,$3*1,0,$4,0,0,0')
-
-    def __init__(self, param, name, macro):
-        super(AMParamStmtEx, self).__init__(param, name, macro)
-        self.primitive_defs = list(to_primitive_defs(self.instructions))
-    
-    def to_inch(self):
-        if self.units == 'metric':
-            self.units = 'inch'
-            for p in self.primitive_defs:
-                p.to_inch()
-
-    def to_metric(self):
-        if self.units == 'inch':
-            self.units = 'metric'
-            for p in self.primitive_defs:
-                p.to_metric()
-
-    def to_gerber(self, settings = None):
-        def plist():
-            for p in self.primitive_defs:
-                yield p.to_gerber(settings)
-        return "%%AM%s*\n%s%%" % (self.name, '\n'.join(plist()))
-
-    def rotate(self, angle, center=None):
-        for primitive_def in self.primitive_defs:
-            primitive_def.rotate(angle, center)
diff --git a/gerberex/utility.py b/gerberex/utility.py
index f90df96..4c89fa6 100644
--- a/gerberex/utility.py
+++ b/gerberex/utility.py
@@ -13,8 +13,7 @@ def rotate(x, y, angle, center):
             sin(angle) * x0 + cos(angle) * y0 + center[1])
 
 def is_equal_value(a, b, error_range=0):
-    return a - b <= error_range and a - b >= -error_range
-
+    return (a - b) * (a - b) <= error_range * error_range
 
 def is_equal_point(a, b, error_range=0):
     return is_equal_value(a[0], b[0], error_range) and \
diff --git a/setup.py b/setup.py
index eb99d92..72d9c18 100644
--- a/setup.py
+++ b/setup.py
@@ -1,11 +1,7 @@
 #!/usr/bin/env python
 # -*- coding: utf-8 -*-
 
-# Copyright 2013-2014 Paulo Henrique Silva <ph.silva@gmail.com>
-
-# Licensed under the Apache License, Version 2.0 (the "License");
-# you may not use this file except in compliance with the License.
-# You may obtain a copy of the License at
+# Copyright 2019 Hiroshi Murayama <opiopan@gmail.com>
 
 import os
 
@@ -14,7 +10,7 @@ def read(fname):
 
 METADATA = {
     'name': 'pcb-tools-extension',
-    'version': "0.1.2",
+    'version': "0.1.4",
     'author': 'Hiroshi Murayama <opiopan@gmail.com>',
     'author_email': "opiopan@gmail.com",
     'description': ("Extension for pcb-tools package to panelize gerber files"),
diff --git a/tests/__init__.py b/tests/__init__.py
new file mode 100644
index 0000000..e69de29
--- /dev/null
+++ b/tests/__init__.py
diff --git a/tests/data/ref_drill_inch.txt b/tests/data/ref_drill_inch.txt
new file mode 100644
index 0000000..8d31df0
--- /dev/null
+++ b/tests/data/ref_drill_inch.txt
@@ -0,0 +1,43 @@
+M48
+FMAT,2
+ICI,OFF
+INCH,TZ,00.0000
+M72
+T01C0.0039
+T02C0.0078
+%
+T01
+X1969Y3740
+X2047Y3740
+X2126Y3740
+X2205Y3740
+X2283Y3740
+X2362Y3740
+X2441Y3740
+X2520Y3740
+X2598Y3740
+X2677Y3740
+X2756Y3740
+X2835Y3740
+X2913Y3740
+X2992Y3740
+X3071Y3740
+X3150Y3740
+X3228Y3740
+X3307Y3740
+X3386Y3740
+X3465Y3740
+X3543Y3740
+T02
+X1969Y197
+X2126Y197
+X2283Y197
+X2441Y197
+X2598Y197
+X2756Y197
+X2913Y197
+X3071Y197
+X3228Y197
+X3386Y197
+X3543Y197
+M30
diff --git a/tests/data/ref_drill_metric.txt b/tests/data/ref_drill_metric.txt
new file mode 100644
index 0000000..87f20f5
--- /dev/null
+++ b/tests/data/ref_drill_metric.txt
@@ -0,0 +1,45 @@
+M48
+FMAT,2
+ICI,OFF
+METRIC,TZ,000.000
+M71
+T01C0.100
+T02C0.200
+%
+T01
+X5000Y9500
+X5200Y9500
+X5400Y9500
+X5600Y9500
+X5800Y9500
+X6000Y9500
+X6200Y9500
+X6400Y9500
+X6600Y9500
+X6800Y9500
+X7000Y9500
+X7200Y9500
+X7400Y9500
+X7600Y9500
+X7800Y9500
+X8000Y9500
+X8200Y9500
+X8400Y9500
+X8600Y9500
+X8800Y9500
+X9000Y9500
+
+T02
+X5000Y500
+X5400Y500
+X5800Y500
+X6200Y500
+X6600Y500
+X7000Y500
+X7400Y500
+X7800Y500
+X8200Y500
+X8600Y500
+X9000Y500
+
+M30
diff --git a/tests/data/ref_dxf_metric.dxf b/tests/data/ref_dxf_metric.dxf
new file mode 100644
index 0000000..89af1e7
--- /dev/null
+++ b/tests/data/ref_dxf_metric.dxf
@@ -0,0 +1,404 @@
+0
+SECTION
+2
+HEADER
+9
+$INSUNITS
+70
+4
+9
+$ACADVER
+1
+AC1014
+9
+$HANDSEED
+5
+FFFF
+0
+ENDSEC
+0
+SECTION
+2
+TABLES
+0
+TABLE
+2
+VPORT
+5
+8
+100
+AcDbSymbolTable
+0
+ENDTAB
+0
+TABLE
+2
+LTYPE
+5
+5
+100
+AcDbSymbolTable
+0
+LTYPE
+5
+14
+100
+AcDbSymbolTableRecord
+100
+AcDbLinetypeTableRecord
+2
+BYBLOCK
+70
+0
+0
+LTYPE
+5
+15
+100
+AcDbSymbolTableRecord
+100
+AcDbLinetypeTableRecord
+2
+BYLAYER
+70
+0
+0
+ENDTAB
+0
+TABLE
+2
+LAYER
+5
+2
+100
+AcDbSymbolTable
+70
+2
+0
+LAYER
+5
+50
+100
+AcDbSymbolTableRecord
+100
+AcDbLayerTableRecord
+2
+0
+70
+0
+6
+CONTINUOUS
+0
+ENDTAB
+0
+TABLE
+2
+STYLE
+5
+3
+100
+AcDbSymbolTable
+70
+1
+0
+STYLE
+5
+11
+100
+AcDbSymbolTableRecord
+100
+AcDbTextStyleTableRecord
+2
+STANDARD
+70
+0
+0
+ENDTAB
+0
+TABLE
+2
+VIEW
+5
+6
+100
+AcDbSymbolTable
+70
+0
+0
+ENDTAB
+0
+TABLE
+2
+UCS
+5
+7
+100
+AcDbSymbolTable
+70
+0
+0
+ENDTAB
+0
+TABLE
+2
+APPID
+5
+9
+100
+AcDbSymbolTable
+70
+2
+0
+APPID
+5
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+X45000Y10000D02*
+X50000Y10000D01*
+G03*
+X55000Y15000I0J5000D01*
+G01*
+X55000Y85000D01*
+G03*
+X50000Y90000I-5000J0D01*
+G01*
+X45000Y90000D01*
+G03*
+X40000Y85000I0J-5000D01*
+G01*
+X40000Y15000D01*
+G03*
+X45000Y10000I5000J0D01*
+G01*
+G37*
+D11*
+X25000Y10000D03*
+D12*
+X25000Y30000D03*
+D13*
+X25000Y50000D03*
+D14*
+X25000Y70000D03*
+D15*
+X25000Y90000D03*
+D16*
+X75000Y50000D03*
+D17*
+X75000Y75000D03*
+D18*
+X75000Y25000D03*
+M02*
diff --git a/tests/expects/RS2724x_to_inch.gtl b/tests/expects/RS2724x_to_inch.gtl
new file mode 100644
index 0000000..3ec60d8
--- /dev/null
+++ b/tests/expects/RS2724x_to_inch.gtl
@@ -0,0 +1,79 @@
+%MOIN*%
+%FSLAX25Y25*%
+%INTop Layer*%
+%IPPOS*%
+%AMCOMP*
+20,1,0.00787402,0,0.00393701,0.015748,0.00393701,$1*
+21,1,0.015748,0.00787402,-0.00787402,-0.00393701,$1*
+1,1,0.015748,-0.0472441,0,$1*
+4,1,4,0.0472441,0,0.0551181,-0.00787402,0.0472441,-0.015748,0.0393701,-0.00787402,0.0472441,0,$1*
+5,1,6,0.0472441,0.00787402,0.015748,$1*
+6,-0.0275591,0,0.019685,0.0019685,0.00590551,2,0.0019685,0.023622,$1*
+7,0.0275591,0,0.023622,0.019685,0.00590551,$1*%
+%ADD10C,0.0003937*%
+%ADD11C,0.03937X0.01575*%
+%ADD12R,0.03937X0.01969X0.007874*%
+%ADD13O,0.03937X0.01969X0.007874*%
+%ADD14O,0.01969X0.03937X0.007874*%
+%ADD15P,0.03937X5X90X0.007874*%
+%ADD16COMP,0*%
+%ADD17COMP,45*%
+%ADD18COMP,-45*%
+G75*
+%LPD*%
+D10*
+G01*
+X3937Y0D02*
+X35433Y0D01*
+G03*
+X39370Y3937I0J3937D01*
+G01*
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+G03*
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+G01*
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+G03*
+X0Y35433I0J-3937D01*
+G01*
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+G03*
+X3937Y0I3937J0D01*
+G01*
+G36*
+G01*
+X17717Y3937D02*
+X19685Y3937D01*
+G03*
+X21654Y5906I0J1969D01*
+G01*
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+G03*
+X19685Y35433I-1969J0D01*
+G01*
+X17717Y35433D01*
+G03*
+X15748Y33465I0J-1969D01*
+G01*
+X15748Y5906D01*
+G03*
+X17717Y3937I1969J0D01*
+G01*
+G37*
+D11*
+X9843Y3937D03*
+D12*
+X9843Y11811D03*
+D13*
+X9843Y19685D03*
+D14*
+X9843Y27559D03*
+D15*
+X9843Y35433D03*
+D16*
+X29528Y19685D03*
+D17*
+X29528Y29528D03*
+D18*
+X29528Y9843D03*
+M02*
diff --git a/tests/expects/RS2724x_to_metric.gtl b/tests/expects/RS2724x_to_metric.gtl
new file mode 100644
index 0000000..93adfc1
--- /dev/null
+++ b/tests/expects/RS2724x_to_metric.gtl
@@ -0,0 +1,79 @@
+%MOMM*%
+%FSLAX34Y34*%
+%INTop Layer*%
+%IPPOS*%
+%AMCOMP*
+20,1,0.2,0,0.1,0.399999,0.1,$1*
+21,1,0.399999,0.2,-0.2,-0.1,$1*
+1,1,0.399999,-1.2,0,$1*
+4,1,4,1.2,0,1.4,-0.2,1.2,-0.399999,1,-0.2,1.2,0,$1*
+5,1,6,1.2,0.2,0.399999,$1*
+6,-0.700001,0,0.499999,0.0499999,0.15,2,0.0499999,0.599999,$1*
+7,0.700001,0,0.599999,0.499999,0.15,$1*%
+%ADD10C,0.01*%
+%ADD11C,1X0.4*%
+%ADD12R,1X0.5001X0.2*%
+%ADD13O,1X0.5001X0.2*%
+%ADD14O,0.5001X1X0.2*%
+%ADD15P,1X5X90X0.2*%
+%ADD16COMP,0*%
+%ADD17COMP,45*%
+%ADD18COMP,-45*%
+G75*
+%LPD*%
+D10*
+G01*
+X10000Y0D02*
+X90000Y0D01*
+G03*
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+G01*
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+G03*
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+G01*
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+G03*
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+G01*
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+G03*
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+G01*
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+G01*
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+X50000Y10000D01*
+G03*
+X55001Y15001I0J5001D01*
+G01*
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+G03*
+X50000Y90000I-5001J0D01*
+G01*
+X45001Y90000D01*
+G03*
+X40000Y85001I0J-5001D01*
+G01*
+X40000Y15001D01*
+G03*
+X45001Y10000I5001J0D01*
+G01*
+G37*
+D11*
+X25001Y10000D03*
+D12*
+X25001Y30000D03*
+D13*
+X25001Y50000D03*
+D14*
+X25001Y70000D03*
+D15*
+X25001Y90000D03*
+D16*
+X75001Y50000D03*
+D17*
+X75001Y75001D03*
+D18*
+X75001Y25001D03*
+M02*
diff --git a/tests/expects/dxf_offset.gtl b/tests/expects/dxf_offset.gtl
new file mode 100644
index 0000000..18d7a62
--- /dev/null
+++ b/tests/expects/dxf_offset.gtl
@@ -0,0 +1,42 @@
+G75*
+%MOMM*%
+%OFA0B0*%
+%FSLAX34Y34*%
+%IPPOS*%
+%LPD*%
+%ADD10C,0*%
+D10*
+G01*
+X200000Y50000D02*
+G75*
+G01*
+X120000Y50000D01*
+G02*
+X110000Y60000I0J10000D01*
+G01*
+X110000Y140000D01*
+G02*
+X120000Y150000I10000J0D01*
+G01*
+X200000Y150000D01*
+G02*
+X210000Y140000I0J-10000D01*
+G01*
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+G02*
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+G01*
+X119171Y100000D02*
+G75*
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+X119171Y100000I-3000J0D01*
+G01*
+X119171Y125107D02*
+G75*
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+X113996Y123041I-3000J0D01*
+G01*
+X116171Y125107D01*
+G01*
+X119171Y125107D01*
+M02*
diff --git a/tests/expects/dxf_rectangle_inch.gtl b/tests/expects/dxf_rectangle_inch.gtl
new file mode 100644
index 0000000..ca99021
--- /dev/null
+++ b/tests/expects/dxf_rectangle_inch.gtl
@@ -0,0 +1,21 @@
+G75*
+%MOIN*%
+%OFA0B0*%
+%FSLAX25Y25*%
+%IPPOS*%
+%LPD*%
+%ADD10C,0*%
+D10*
+G01*
+X0Y0D02*
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+G01*
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+G01*
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+X0Y39370D01*
+G01*
+X0Y39370D02*
+X0Y0D01*
+M02*
diff --git a/tests/expects/dxf_rectangle_metric.gtl b/tests/expects/dxf_rectangle_metric.gtl
new file mode 100644
index 0000000..db4c439
--- /dev/null
+++ b/tests/expects/dxf_rectangle_metric.gtl
@@ -0,0 +1,21 @@
+G75*
+%MOMM*%
+%OFA0B0*%
+%FSLAX34Y34*%
+%IPPOS*%
+%LPD*%
+%ADD10C,0*%
+D10*
+G01*
+X0Y0D02*
+X100000Y0D01*
+G01*
+X100000Y0D02*
+X100000Y100000D01*
+G01*
+X100000Y100000D02*
+X0Y100000D01*
+G01*
+X0Y100000D02*
+X0Y0D01*
+M02*
diff --git a/tests/expects/dxf_rotate.gtl b/tests/expects/dxf_rotate.gtl
new file mode 100644
index 0000000..912ad60
--- /dev/null
+++ b/tests/expects/dxf_rotate.gtl
@@ -0,0 +1,42 @@
+G75*
+%MOMM*%
+%OFA0B0*%
+%FSLAX34Y34*%
+%IPPOS*%
+%LPD*%
+%ADD10C,0*%
+D10*
+G01*
+X124805Y2611D02*
+G75*
+G01*
+X49630Y-24751D01*
+G02*
+X36813Y-18774I-3420J9397D01*
+G01*
+X9451Y56401D01*
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+X15428Y69218I9397J3420D01*
+G01*
+X90603Y96580D01*
+G02*
+X103420Y90603I3420J-9397D01*
+G01*
+X130782Y15428D01*
+G02*
+X124805Y2611I-9397J-3420D01*
+G01*
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+G75*
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+G01*
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+X19006Y41831I-2819J-1026D01*
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+X20343Y44517D01*
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diff --git a/tests/expects/dxf_save_fill.gtl b/tests/expects/dxf_save_fill.gtl
new file mode 100644
index 0000000..c293826
--- /dev/null
+++ b/tests/expects/dxf_save_fill.gtl
@@ -0,0 +1,44 @@
+G75*
+%MOMM*%
+%OFA0B0*%
+%FSLAX34Y34*%
+%IPPOS*%
+%LPD*%
+%ADD10C,0*%
+D10*
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+G01*
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+G01*
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+G37*
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diff --git a/tests/expects/dxf_save_line.gtl b/tests/expects/dxf_save_line.gtl
new file mode 100644
index 0000000..e9a931b
--- /dev/null
+++ b/tests/expects/dxf_save_line.gtl
@@ -0,0 +1,42 @@
+G75*
+%MOMM*%
+%OFA0B0*%
+%FSLAX34Y34*%
+%IPPOS*%
+%LPD*%
+%ADD10C,0*%
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+G01*
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diff --git a/tests/expects/dxf_save_mousebites.gtl b/tests/expects/dxf_save_mousebites.gtl
new file mode 100644
index 0000000..b893454
--- /dev/null
+++ b/tests/expects/dxf_save_mousebites.gtl
@@ -0,0 +1,29 @@
+G75*
+%MOMM*%
+%OFA0B0*%
+%FSLAX34Y34*%
+%IPPOS*%
+%LPD*%
+%ADD10C,0.5*%
+D10*
+X10000Y90000D03*
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+
+X50000Y90000D03*
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+X50000Y50000D03*
+X50000Y40000D03*
+X50000Y30000D03*
+X50000Y20000D03*
+X50000Y10000D03*
+
+M02*
diff --git a/tests/expects/dxf_save_mousebites.txt b/tests/expects/dxf_save_mousebites.txt
new file mode 100644
index 0000000..4a371ef
--- /dev/null
+++ b/tests/expects/dxf_save_mousebites.txt
@@ -0,0 +1,29 @@
+M48
+FMAT,2
+ICI,OFF
+METRIC,TZ,000.000
+M71
+T01C0.500
+%
+T01
+X1000Y9000
+X1000Y8000
+X1000Y7000
+X1000Y6000
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+X1000Y4000
+X1000Y3000
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+
+X5000Y9000
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+X5000Y5000
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+
+M30
diff --git a/tests/expects/dxf_to_inch.gtl b/tests/expects/dxf_to_inch.gtl
new file mode 100644
index 0000000..ee630c9
--- /dev/null
+++ b/tests/expects/dxf_to_inch.gtl
@@ -0,0 +1,42 @@
+G75*
+%MOIN*%
+%OFA0B0*%
+%FSLAX25Y25*%
+%IPPOS*%
+%LPD*%
+%ADD10C,0*%
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diff --git a/tests/expects/excellon_offset.txt b/tests/expects/excellon_offset.txt
new file mode 100644
index 0000000..2007248
--- /dev/null
+++ b/tests/expects/excellon_offset.txt
@@ -0,0 +1,43 @@
+M48
+FMAT,2
+ICI,OFF
+METRIC,TZ,000.000
+M71
+T01C0.100
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+%
+T01
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diff --git a/tests/expects/excellon_rotate.txt b/tests/expects/excellon_rotate.txt
new file mode 100644
index 0000000..2ef3540
--- /dev/null
+++ b/tests/expects/excellon_rotate.txt
@@ -0,0 +1,43 @@
+M48
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+METRIC,TZ,000.000
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diff --git a/tests/expects/excellon_save.txt b/tests/expects/excellon_save.txt
new file mode 100644
index 0000000..a1d2ba8
--- /dev/null
+++ b/tests/expects/excellon_save.txt
@@ -0,0 +1,43 @@
+M48
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+ICI,OFF
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diff --git a/tests/expects/excellon_to_inch.txt b/tests/expects/excellon_to_inch.txt
new file mode 100644
index 0000000..8d31df0
--- /dev/null
+++ b/tests/expects/excellon_to_inch.txt
@@ -0,0 +1,43 @@
+M48
+FMAT,2
+ICI,OFF
+INCH,TZ,00.0000
+M72
+T01C0.0039
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+%
+T01
+X1969Y3740
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diff --git a/tests/expects/excellon_to_metric.txt b/tests/expects/excellon_to_metric.txt
new file mode 100644
index 0000000..a634742
--- /dev/null
+++ b/tests/expects/excellon_to_metric.txt
@@ -0,0 +1,43 @@
+M48
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+METRIC,TZ,000.000
+M71
+T01C0.099
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+X7201Y9500
+X7399Y9500
+X7600Y9500
+X7800Y9500
+X8001Y9500
+X8199Y9500
+X8400Y9500
+X8600Y9500
+X8801Y9500
+X8999Y9500
+T02
+X5001Y500
+X5400Y500
+X5799Y500
+X6200Y500
+X6599Y500
+X7000Y500
+X7399Y500
+X7800Y500
+X8199Y500
+X8600Y500
+X8999Y500
+M30
diff --git a/tests/test_am_expression.py b/tests/test_am_expression.py
new file mode 100644
index 0000000..6786cc3
--- /dev/null
+++ b/tests/test_am_expression.py
@@ -0,0 +1,207 @@
+#!/usr/bin/env python
+# -*- coding: utf-8 -*-
+
+# Copyright 2019 Hiroshi Murayama <opiopan@gmail.com>
+
+import unittest
+from gerberex.am_expression import *
+from gerberex.am_expression import AMOperatorExpression as Op
+from gerber.utils import inch, metric
+from gerber.am_read import read_macro
+
+class TestAMConstantExpression(unittest.TestCase):
+    def setUp(self):
+        self.const_int_value = 7
+        self.const_int = AMConstantExpression(self.const_int_value)
+        self.const_float_value = 1.2345
+        self.const_float = AMConstantExpression(self.const_float_value)
+
+    def test_contruct(self):
+        self.assertEqual(self.const_int.value, self.const_int_value)
+        self.assertEqual(self.const_float.value, self.const_float_value)
+
+    def test_optimize(self):
+        ov = self.const_int.optimize()
+        self.assertEqual(ov.value, self.const_int_value)
+        ov = self.const_float.optimize()
+        self.assertEqual(ov.value, self.const_float_value)
+    
+    def test_to_gerber(self):
+        self.assertEqual(self.const_int.to_gerber(), '7')
+        self.assertEqual(self.const_float.to_gerber(), '1.2345')
+
+    def test_to_instructions(self):
+        self.const_int.to_instructions()
+        self.const_float.to_instructions()
+
+class TestAMVariableExpression(unittest.TestCase):
+    def setUp(self):
+        self.var1_num = 1
+        self.var1 = AMVariableExpression(self.var1_num)
+        self.var2_num = 512
+        self.var2 = AMVariableExpression(self.var2_num)
+
+    def test_construction(self):
+        self.assertEqual(self.var1.number, self.var1_num)
+        self.assertEqual(self.var2.number, self.var2_num)
+    
+    def test_optimize(self):
+        ov = self.var1.optimize()
+        self.assertTrue(isinstance(ov, AMVariableExpression))
+        self.assertEqual(ov.number, self.var1_num)
+        ov = self.var2.optimize()
+        self.assertTrue(isinstance(ov, AMVariableExpression))
+        self.assertEqual(ov.number, self.var2_num)
+
+    def test_to_gerber(self):
+        self.assertEqual(self.var1.to_gerber(), '$1')
+        self.assertEqual(self.var2.to_gerber(), '$512')
+
+    def test_to_instructions(self):
+        self.var1.to_instructions()
+        self.var2.to_instructions()
+
+class TestAMOperatorExpression(unittest.TestCase):
+    def setUp(self):
+        self.c1 = 10
+        self.c2 = 20
+        self.v1 = 5
+        self.v2 = 9
+        c1 = AMConstantExpression(self.c1)
+        c2 = AMConstantExpression(self.c2)
+        v1 = AMVariableExpression(self.v1)
+        v2 = AMVariableExpression(self.v2)
+
+        self.cc_exps = [
+            (Op.ADD, AMOperatorExpression(Op.ADD, c1, c2)),
+            (Op.SUB, AMOperatorExpression(Op.SUB, c1, c2)),
+            (Op.MUL, AMOperatorExpression(Op.MUL, c1, c2)),
+            (Op.DIV, AMOperatorExpression(Op.DIV, c1, c2)),
+        ]
+
+        self.cv_exps = [
+            (Op.ADD, AMOperatorExpression(Op.ADD, c1, v2)),
+            (Op.SUB, AMOperatorExpression(Op.SUB, c1, v2)),
+            (Op.MUL, AMOperatorExpression(Op.MUL, c1, v2)),
+            (Op.DIV, AMOperatorExpression(Op.DIV, c1, v2)),
+        ]
+        self.vc_exps = [
+            (Op.ADD, AMOperatorExpression(Op.ADD, v1, c2)),
+            (Op.SUB, AMOperatorExpression(Op.SUB, v1, c2)),
+            (Op.MUL, AMOperatorExpression(Op.MUL, v1, c2)),
+            (Op.DIV, AMOperatorExpression(Op.DIV, v1, c2)),
+        ]
+
+        self.composition = AMOperatorExpression(Op.ADD, 
+                                                self.cc_exps[0][1], self.cc_exps[0][1])
+    
+    def test_optimize(self):
+        self.assertEqual(self.cc_exps[0][1].optimize().value, self.c1 + self.c2)
+        self.assertEqual(self.cc_exps[1][1].optimize().value, self.c1 - self.c2)
+        self.assertEqual(self.cc_exps[2][1].optimize().value, self.c1 * self.c2)
+        self.assertEqual(self.cc_exps[3][1].optimize().value, self.c1 / self.c2)
+
+        for op, expression in self.cv_exps:
+            o = expression.optimize()
+            self.assertTrue(isinstance(o, AMOperatorExpression))
+            self.assertEqual(o.op, op)
+            self.assertEqual(o.lvalue.value, self.c1)
+            self.assertEqual(o.rvalue.number, self.v2)
+        
+        for op, expression in self.vc_exps:
+            o = expression.optimize()
+            self.assertTrue(isinstance(o, AMOperatorExpression))
+            self.assertEqual(o.op, op)
+            self.assertEqual(o.lvalue.number, self.v1)
+            self.assertEqual(o.rvalue.value, self.c2)
+
+        self.assertEqual(self.composition.optimize().value, (self.c1 + self.c2) * 2)
+
+    def test_to_gerber(self):
+        for op, expression in self.cc_exps:
+            self.assertEqual(expression.to_gerber(),
+                             '({0}){1}({2})'.format(self.c1, op, self.c2))
+        for op, expression in self.cv_exps:
+            self.assertEqual(expression.to_gerber(),
+                             '({0}){1}(${2})'.format(self.c1, op, self.v2))
+        for op, expression in self.vc_exps:
+            self.assertEqual(expression.to_gerber(),
+                             '(${0}){1}({2})'.format(self.v1, op, self.c2))
+        self.assertEqual(self.composition.to_gerber(), 
+                         '(({0})+({1}))+(({2})+({3}))'.format(
+                             self.c1, self.c2, self.c1, self.c2
+                         ))
+    
+    def test_to_instructions(self):
+        for of, expression in self.vc_exps + self.cv_exps + self.cc_exps:
+            expression.to_instructions()
+        self.composition.to_instructions()
+
+class TestAMExpression(unittest.TestCase):
+    def setUp(self):
+        self.c1 = 10
+        self.c1_exp = AMConstantExpression(self.c1)
+        self.v1 = 5
+        self.v1_exp = AMVariableExpression(self.v1)
+        self.op_exp = AMOperatorExpression(Op.ADD, self.c1_exp, self.v1_exp)
+
+    def test_to_inch(self):
+        o = self.c1_exp.to_inch().optimize()
+        self.assertEqual(o.value, inch(self.c1))
+        o = self.v1_exp.to_inch().optimize()
+        self.assertTrue(isinstance(o, AMOperatorExpression))
+        self.assertEqual(o.op, Op.DIV)
+        o = self.op_exp.to_inch().optimize()
+        self.assertTrue(isinstance(o, AMOperatorExpression))
+        self.assertEqual(o.op, Op.DIV)
+
+    def test_to_metric(self):
+        o = self.c1_exp.to_metric().optimize()
+        self.assertEqual(o.value, metric(self.c1))
+        o = self.v1_exp.to_metric().optimize()
+        self.assertTrue(isinstance(o, AMOperatorExpression))
+        self.assertEqual(o.op, Op.MUL)
+        o = self.op_exp.to_metric().optimize()
+        self.assertTrue(isinstance(o, AMOperatorExpression))
+        self.assertEqual(o.op, Op.MUL)
+
+class TestEvalMacro(unittest.TestCase):
+    def test_eval_macro(self):
+        macros = [
+            '$1=5.5*',
+            '$2=$3*',
+            '$3=(1.23)+(4.56)*',
+            '$3=(1.23)-(4.56)*',
+            '$3=(1.23)X(4.56)*',
+            '$3=(1.23)/(4.56)*',
+            '$3=(10.2)X($2)*',
+            '1,1.2*',
+            '1,$2*',
+            '1,($2)+($3)*',
+            #'1,(2.0)-($3)*',  # This doesn't pass due to pcb-tools bug
+            '1,($2)X($3)*',
+            '1,($2)/($3)*',
+            '1,2.1,3.2*2,(3.1)/($1),$2*'
+        ]
+        for macro in macros:
+            self._eval_macro_string(macro)
+
+    def _eval_macro_string(self, macro):
+        expressions = eval_macro(read_macro(macro))
+        gerber = self._to_gerber(expressions)
+        self.assertEqual(macro, gerber)
+
+    def _to_gerber(self, expressions_list):
+        gerber = ''
+        for number, expressions in expressions_list:
+            self.assertTrue(isinstance(number, int))
+            if number > 0:
+                egerbers = [exp.to_gerber() for exp in expressions]
+                gerber += '{0},{1}*'.format(number, ','.join(egerbers))
+            else:
+                self.assertEqual(len(expressions), 1)
+                gerber += '${0}={1}*'.format(-number, expressions[0].to_gerber())
+        return gerber
+
+if __name__ == '__main__':
+    unittest.main()
diff --git a/tests/test_dxf.py b/tests/test_dxf.py
new file mode 100644
index 0000000..31589da
--- /dev/null
+++ b/tests/test_dxf.py
@@ -0,0 +1,113 @@
+#!/usr/bin/env python
+# -*- coding: utf-8 -*-
+
+# Copyright 2019 Hiroshi Murayama <opiopan@gmail.com>
+
+import os
+import unittest
+import gerberex
+from gerber.utils import inch, metric
+
+
+class TestExcellon(unittest.TestCase):
+    @classmethod
+    def setUpClass(cls):
+        os.chdir(os.path.dirname(__file__))
+        cls.INDIR = 'data'
+        cls.OUTDIR = 'outputs'
+        cls.EXPECTSDIR = 'expects'
+        cls.OUTPREFIX = 'dxf_'
+        cls.METRIC_FILE = os.path.join(cls.INDIR, 'ref_dxf_metric.dxf')
+        cls.INCH_FILE = os.path.join(cls.INDIR, 'ref_dxf_inch.dxf')
+        cls.MOUSEBITES_FILE = os.path.join(cls.INDIR, 'ref_dxf_mousebites.dxf')
+        try:
+            os.mkdir(cls.OUTDIR)
+        except FileExistsError:
+            pass
+
+    def _checkResult(self, file):
+        with open(file, 'r') as f:
+            data = f.read()
+        with open(os.path.join(self.EXPECTSDIR, os.path.basename(file)), 'r') as f:
+            expect = f.read()
+        self.assertEqual(data, expect)
+
+    def test_save_line(self):
+        outfile = os.path.join(self.OUTDIR, self.OUTPREFIX + 'save_line.gtl')
+        dxf = gerberex.read(self.METRIC_FILE)
+        dxf.draw_mode = dxf.DM_LINE
+        dxf.write(outfile)
+        self._checkResult(outfile)
+
+    def test_save_fill(self):
+        outfile = os.path.join(self.OUTDIR, self.OUTPREFIX + 'save_fill.gtl')
+        dxf = gerberex.read(self.METRIC_FILE)
+        dxf.draw_mode = dxf.DM_FILL
+        dxf.write(outfile)
+        self._checkResult(outfile)
+
+    def test_save_mousebites(self):
+        outfile = os.path.join(self.OUTDIR, self.OUTPREFIX + 'save_mousebites.gtl')
+        dxf = gerberex.read(self.MOUSEBITES_FILE)
+        dxf.draw_mode = dxf.DM_MOUSE_BITES
+        dxf.width = 0.5
+        dxf.pitch = 1
+        dxf.write(outfile)
+        self._checkResult(outfile)
+
+    def test_save_excellon(self):
+        outfile = os.path.join(
+            self.OUTDIR, self.OUTPREFIX + 'save_mousebites.txt')
+        dxf = gerberex.read(self.MOUSEBITES_FILE)
+        dxf.draw_mode = dxf.DM_MOUSE_BITES
+        dxf.format = (3,3)
+        dxf.width = 0.5
+        dxf.pitch = 1
+        dxf.write(outfile, filetype=dxf.FT_EXCELLON)
+        self._checkResult(outfile)
+
+    def test_to_inch(self):
+        outfile = os.path.join(self.OUTDIR, self.OUTPREFIX + 'to_inch.gtl')
+        dxf = gerberex.read(self.METRIC_FILE)
+        dxf.to_inch()
+        dxf.format = (2, 5)
+        dxf.write(outfile)
+        self._checkResult(outfile)
+
+    def _test_to_metric(self):
+        outfile = os.path.join(self.OUTDIR, self.OUTPREFIX + 'to_metric.gtl')
+        dxf = gerberex.read(self.INCH_FILE)
+        dxf.to_metric()
+        dxf.format = (3, 5)
+        dxf.write(outfile)
+        self._checkResult(outfile)
+
+    def test_offset(self):
+        outfile = os.path.join(self.OUTDIR, self.OUTPREFIX + 'offset.gtl')
+        dxf = gerberex.read(self.METRIC_FILE)
+        dxf.offset(11, 5)
+        dxf.write(outfile)
+        self._checkResult(outfile)
+
+    def test_rotate(self):
+        outfile = os.path.join(self.OUTDIR, self.OUTPREFIX + 'rotate.gtl')
+        dxf = gerberex.read(self.METRIC_FILE)
+        dxf.rotate(20, (10, 10))
+        dxf.write(outfile)
+        self._checkResult(outfile)
+
+    def test_rectangle_metric(self):
+        outfile = os.path.join(self.OUTDIR, self.OUTPREFIX + 'rectangle_metric.gtl')
+        dxf = gerberex.DxfFile.rectangle(width=10, height=10, units='metric')
+        dxf.write(outfile)
+        self._checkResult(outfile)
+
+    def test_rectangle_inch(self):
+        outfile = os.path.join(
+            self.OUTDIR, self.OUTPREFIX + 'rectangle_inch.gtl')
+        dxf = gerberex.DxfFile.rectangle(width=inch(10), height=inch(10), units='inch')
+        dxf.write(outfile)
+        self._checkResult(outfile)
+
+if __name__ == '__main__':
+    unittest.main()
diff --git a/tests/test_excellon.py b/tests/test_excellon.py
new file mode 100644
index 0000000..36093cd
--- /dev/null
+++ b/tests/test_excellon.py
@@ -0,0 +1,72 @@
+#!/usr/bin/env python
+# -*- coding: utf-8 -*-
+
+# Copyright 2019 Hiroshi Murayama <opiopan@gmail.com>
+
+import os
+import unittest
+import gerberex
+
+
+class TestExcellon(unittest.TestCase):
+    @classmethod
+    def setUpClass(cls):
+        os.chdir(os.path.dirname(__file__))
+        cls.INDIR = 'data'
+        cls.OUTDIR = 'outputs'
+        cls.EXPECTSDIR = 'expects'
+        cls.OUTPREFIX = 'excellon_'
+        cls.METRIC_FILE = os.path.join(cls.INDIR, 'ref_drill_metric.txt')
+        cls.INCH_FILE = os.path.join(cls.INDIR, 'ref_drill_inch.txt')
+        try:
+            os.mkdir(cls.OUTDIR)
+        except FileExistsError:
+            pass
+
+    def _checkResult(self, file):
+        with open(file, 'r') as f:
+            data = f.read()
+        with open(os.path.join(self.EXPECTSDIR, os.path.basename(file)), 'r') as f:
+            expect = f.read()
+        self.assertEqual(data, expect)
+        pass
+
+    def test_save(self):
+        outfile = os.path.join(self.OUTDIR, self.OUTPREFIX + 'save.txt')
+        drill = gerberex.read(self.METRIC_FILE)
+        drill.write(outfile)
+        self._checkResult(outfile)
+
+    def test_to_inch(self):
+        outfile = os.path.join(self.OUTDIR, self.OUTPREFIX + 'to_inch.txt')
+        drill = gerberex.read(self.METRIC_FILE)
+        drill.to_inch()
+        drill.format = (2, 4)
+        drill.write(outfile)
+        self._checkResult(outfile)
+
+    def test_to_metric(self):
+        outfile = os.path.join(self.OUTDIR, self.OUTPREFIX + 'to_metric.txt')
+        drill = gerberex.read(self.INCH_FILE)
+        drill.to_metric()
+        drill.format = (3, 3)
+        drill.write(outfile)
+        self._checkResult(outfile)
+
+    def test_offset(self):
+        outfile = os.path.join(self.OUTDIR, self.OUTPREFIX + 'offset.txt')
+        drill = gerberex.read(self.METRIC_FILE)
+        drill.offset(11, 5)
+        drill.write(outfile)
+        self._checkResult(outfile)
+
+    def test_rotate(self):
+        outfile = os.path.join(self.OUTDIR, self.OUTPREFIX + 'rotate.txt')
+        drill = gerberex.read(self.METRIC_FILE)
+        drill.rotate(20, (10, 10))
+        drill.write(outfile)
+        self._checkResult(outfile)
+
+
+if __name__ == '__main__':
+    unittest.main()
diff --git a/tests/test_rs274x.py b/tests/test_rs274x.py
new file mode 100644
index 0000000..3e44066
--- /dev/null
+++ b/tests/test_rs274x.py
@@ -0,0 +1,69 @@
+#!/usr/bin/env python
+# -*- coding: utf-8 -*-
+
+# Copyright 2019 Hiroshi Murayama <opiopan@gmail.com>
+
+import os
+import unittest
+import gerberex
+
+class TestRs274x(unittest.TestCase):
+    @classmethod
+    def setUpClass(cls):
+        os.chdir(os.path.dirname(__file__))
+        cls.INDIR = 'data'
+        cls.OUTDIR = 'outputs'
+        cls.EXPECTSDIR = 'expects'
+        cls.OUTPREFIX = 'RS2724x_'
+        cls.METRIC_FILE = os.path.join(cls.INDIR, 'ref_gerber_metric.gtl')
+        cls.INCH_FILE = os.path.join(cls.INDIR, 'ref_gerber_inch.gtl')
+        try:
+            os.mkdir(cls.OUTDIR)
+        except FileExistsError:
+            pass
+
+    def _checkResult(self, file):
+        with open(file, 'r') as f:
+            data = f.read()
+        with open(os.path.join(self.EXPECTSDIR, os.path.basename(file)), 'r') as f:
+            expect = f.read()
+        self.assertEqual(data, expect)
+
+    def test_save(self):
+        outfile=os.path.join(self.OUTDIR, self.OUTPREFIX + 'save.gtl')
+        gerber = gerberex.read(self.METRIC_FILE)
+        gerber.write(outfile)
+        self._checkResult(outfile)
+
+    def test_to_inch(self):
+        outfile = os.path.join(self.OUTDIR, self.OUTPREFIX + 'to_inch.gtl')
+        gerber = gerberex.read(self.METRIC_FILE)
+        gerber.to_inch()
+        gerber.format = (2,5)
+        gerber.write(outfile)
+        self._checkResult(outfile)
+
+    def test_to_metric(self):
+        outfile = os.path.join(self.OUTDIR, self.OUTPREFIX + 'to_metric.gtl')
+        gerber = gerberex.read(self.INCH_FILE)
+        gerber.to_metric()
+        gerber.format = (3, 4)
+        gerber.write(outfile)
+        self._checkResult(outfile)
+
+    def test_offset(self):
+        outfile = os.path.join(self.OUTDIR, self.OUTPREFIX + 'offset.gtl')
+        gerber = gerberex.read(self.METRIC_FILE)
+        gerber.offset(11, 5)
+        gerber.write(outfile)
+        self._checkResult(outfile)
+
+    def test_rotate(self):
+        outfile = os.path.join(self.OUTDIR, self.OUTPREFIX + 'rotate.gtl')
+        gerber = gerberex.read(self.METRIC_FILE)
+        gerber.rotate(20, (10,10))
+        gerber.write(outfile)
+        self._checkResult(outfile)
+
+if __name__ == '__main__':
+    unittest.main()
diff --git a/tests/test_utility.py b/tests/test_utility.py
new file mode 100644
index 0000000..4ede8d5
--- /dev/null
+++ b/tests/test_utility.py
@@ -0,0 +1,65 @@
+#!/usr/bin/env python
+# -*- coding: utf-8 -*-
+
+# Copyright 2019 Hiroshi Murayama <opiopan@gmail.com>
+
+import unittest
+
+from gerberex.utility import *
+from math import sqrt
+
+class TestUtility(unittest.TestCase):
+    def test_rotate(self):
+        x0, y0 = (10, 0)
+
+        x1, y1 = rotate(x0, y0, 60, (0, 0))
+        self.assertAlmostEqual(x1, 5)
+        self.assertAlmostEqual(y1, 10 * sqrt(3) / 2)
+
+        x1, y1 = rotate(x0, y0, 180, (5, 0))
+        self.assertAlmostEqual(x1, 0)
+        self.assertAlmostEqual(y1, 0)
+
+        x1, y1 = rotate(x0, y0, -90, (10, 5))
+        self.assertAlmostEqual(x1, 5)
+        self.assertAlmostEqual(y1, 5)
+
+    def test_is_equal_value(self):
+        a = 10.0001
+        b = 10.01
+
+        self.assertTrue(is_equal_value(a, b, 0.1))
+        self.assertTrue(is_equal_value(a, b, 0.01))
+        self.assertFalse(is_equal_value(a, b, 0.001))
+        self.assertFalse(is_equal_value(a, b))
+
+        self.assertTrue(is_equal_value(b, a, 0.1))
+        self.assertTrue(is_equal_value(b, a, 0.01))
+        self.assertFalse(is_equal_value(b, a, 0.001))
+        self.assertFalse(is_equal_value(b, a))
+
+    def test_is_equal_point(self):
+        p0 = (10.01, 5.001)
+        p1 = (10.0001, 5)
+        self.assertTrue(is_equal_point(p0, p1, 0.1))
+        self.assertTrue(is_equal_point(p0, p1, 0.01))
+        self.assertFalse(is_equal_point(p0, p1, 0.001))
+        self.assertFalse(is_equal_point(p0, p1))
+        self.assertTrue(is_equal_point(p1, p0, 0.1))
+        self.assertTrue(is_equal_point(p1, p0, 0.01))
+        self.assertFalse(is_equal_point(p1, p0, 0.001))
+        self.assertFalse(is_equal_point(p1, p0))
+
+        p0 = (5.001, 10.01)
+        p1 = (5, 10.0001)
+        self.assertTrue(is_equal_point(p0, p1, 0.1))
+        self.assertTrue(is_equal_point(p0, p1, 0.01))
+        self.assertFalse(is_equal_point(p0, p1, 0.001))
+        self.assertFalse(is_equal_point(p0, p1))
+        self.assertTrue(is_equal_point(p1, p0, 0.1))
+        self.assertTrue(is_equal_point(p1, p0, 0.01))
+        self.assertFalse(is_equal_point(p1, p0, 0.001))
+        self.assertFalse(is_equal_point(p1, p0))
+
+if __name__ == '__main__':
+    unittest.main()