data write directory change. shapely library include.

[openembroidery/EmbroideryOutputExtensionForInkscape.git] / embroider / shapely / tests / test_invalid_geometries.py

diff --git a/embroider/shapely/tests/test_invalid_geometries.py b/embroider/shapely/tests/test_invalid_geometries.py
new file mode 100644 (file)
index 0000000..3dfa3c0
--- /dev/null
+++ b/embroider/shapely/tests/test_invalid_geometries.py
@@ -0,0 +1,30 @@
+'''Test recovery from operation on invalid geometries
+'''
+
+from . import unittest
+from shapely.geometry import Polygon
+from shapely.topology import TopologicalError
+
+
+class InvalidGeometriesTestCase(unittest.TestCase):
+
+    def test_invalid_intersection(self):
+        # Make a self-intersecting polygon
+        polygon_invalid = Polygon(((0, 0), (1, 1), (1, -1), (0, 1), (0, 0)))
+        self.assertFalse(polygon_invalid.is_valid)
+
+        # Intersect with a valid polygon
+        polygon = Polygon(((-.5, -.5), (-.5, .5), (.5, .5), (.5, -5)))
+        self.assertTrue(polygon.is_valid)
+        self.assertTrue(polygon_invalid.intersects(polygon))
+        self.assertRaises(TopologicalError,
+                          polygon_invalid.intersection, polygon)
+        self.assertRaises(TopologicalError,
+                          polygon.intersection, polygon_invalid)
+        return
+
+
+def test_suite():
+    loader = unittest.TestLoader()
+    return unittest.TestSuite([
+        loader.loadTestsFromTestCase(InvalidGeometriesTestCase)])