Migrate to pytest (#111)

* Migrate to pytest

All tests were update to use pytest.

Tests were alse black formatted. Eventually all code
will be black formatted but need to merge some PRs first.

1 files changed, 76 insertions, 29 deletions

diff --git a/gerber/tests/test_rs274x_backend.py b/gerber/tests/test_rs274x_backend.py
index e128841..13347c5 100644
--- a/gerber/tests/test_rs274x_backend.py
+++ b/gerber/tests/test_rs274x_backend.py
@@ -7,62 +7,86 @@ 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')
+    _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')
+    _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')
+    _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')
+    _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')
+    _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')
+    _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')
+    _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')
+    _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')
+    _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')
+    _test_render(
+        "resources/example_overlapping_contour.gbr",
+        "golden/example_overlapping_contour.gbr",
+    )
 
 
 def _DISABLED_test_render_level_holes():
@@ -70,76 +94,96 @@ def _DISABLED_test_render_level_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')
+    _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')
+    _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')
+    _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')
+    _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')
+    _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')
+    _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')
+    _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')
+    _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')
+    _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')
+    _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')
+    _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)
+    return os.path.join(os.path.dirname(__file__), path)
 
 
-def _test_render(gerber_path, png_expected_path, create_output_path = None):
+def _test_render(gerber_path, png_expected_path, create_output_path=None):
     """Render the gerber file and compare to the expected PNG output.
 
     Parameters
@@ -168,18 +212,21 @@ def _test_render(gerber_path, png_expected_path, create_output_path = 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:
+        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,))
+        assert not 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:
+    with open(png_expected_path, "r") as expected_file:
         expected_contents = expected_file.read()
 
-    assert_equal(expected_contents, actual_contents.getvalue())
+    assert expected_contents == actual_contents.getvalue()
 
     return gerber