Add test for 3d conversion of empty PolyCollection

timhoffm · timhoffm · commit 98ebe3d8a6ab · 2018-12-09T13:46:04.000+01:00
diff --git a/lib/mpl_toolkits/tests/test_mplot3d.py b/lib/mpl_toolkits/tests/test_mplot3d.py
@@ -3,7 +3,7 @@
 from mpl_toolkits.mplot3d import Axes3D, axes3d, proj3d, art3d
 from matplotlib import cm
 from matplotlib.testing.decorators import image_comparison, check_figures_equal
-from matplotlib.collections import LineCollection
+from matplotlib.collections import LineCollection, PolyCollection
 from matplotlib.patches import Circle
 import matplotlib.pyplot as plt
 import numpy as np
@@ -440,6 +440,13 @@ def test_poly3dcollection_closed():
     ax.add_collection3d(c2)
 
 
+def test_poly_collection_2d_to_3d_empty():
+    poly = PolyCollection([])
+    art3d.poly_collection_2d_to_3d(poly)
+    assert isinstance(poly, art3d.Poly3DCollection)
+    assert poly.get_paths() == []
+
+
 @image_comparison(baseline_images=['axes3d_labelpad'], extensions=['png'])
 def test_axes3d_labelpad():
     from matplotlib import rcParams
