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-rw-r--r--gerber/tests/test_cairo_backend.py59
1 files changed, 59 insertions, 0 deletions
diff --git a/gerber/tests/test_cairo_backend.py b/gerber/tests/test_cairo_backend.py
new file mode 100644
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--- /dev/null
+++ b/gerber/tests/test_cairo_backend.py
@@ -0,0 +1,59 @@
+#! /usr/bin/env python
+# -*- coding: utf-8 -*-
+
+# Author: Garret Fick <garret@ficksworkshop.com>
+import os
+import io
+
+from ..render.cairo_backend import GerberCairoContext
+from ..rs274x import read, GerberFile
+from .tests import *
+
+
+
+TWO_BOXES_FILE = os.path.join(os.path.dirname(__file__),
+ 'resources/example_two_square_boxes.gbr')
+TWO_BOXES_EXPECTED = os.path.join(os.path.dirname(__file__),
+ 'golden/example_two_square_boxes.png')
+
+def test_render_polygon():
+
+ _test_render(TWO_BOXES_FILE, TWO_BOXES_EXPECTED)
+
+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 = 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()
+
+ assert_equal(expected_bytes, actual_bytes)