Test for patch color override warnings

dstansby · dstansby · commit c09bef2fcc98 · 2020-07-25T16:11:15.000+01:00
diff --git a/lib/matplotlib/tests/test_patches.py b/lib/matplotlib/tests/test_patches.py
@@ -5,7 +5,7 @@
 from numpy.testing import assert_almost_equal, assert_array_equal
 import pytest
 
-from matplotlib.patches import Polygon, Rectangle, FancyArrowPatch
+from matplotlib.patches import Patch, Polygon, Rectangle, FancyArrowPatch
 from matplotlib.testing.decorators import image_comparison, check_figures_equal
 from matplotlib.transforms import Bbox
 import matplotlib.pyplot as plt
@@ -563,3 +563,11 @@ def test_degenerate_polygon():
     point = [0, 0]
     correct_extents = Bbox([point, point]).extents
     assert np.all(Polygon([point]).get_extents().extents == correct_extents)
+
+
+@pytest.mark.parametrize('kwarg', ('edgecolor', 'facecolor'))
+def test_color_override_warning(kwarg):
+    with pytest.warns(UserWarning,
+                      match="Setting the 'color' property will override "
+                            "the edgecolor or facecolor properties."):
+        Patch(color='black', **{kwarg: 'black'})
