2 files changed, 24 insertions, 0 deletions
diff --git a/stsci/sphere/test/test_intersection.py b/stsci/sphere/test/test_intersection.py
index 3576cc1..08ed258 100644
--- a/stsci/sphere/test/test_intersection.py
+++ b/stsci/sphere/test/test_intersection.py
@@ -176,6 +176,18 @@ def test6():
     return [poly1, poly2]
 
 
+def test_union_empty():
+    p = polygon.SphericalPolygon.from_cone(
+        random.randrange(-180, 180),
+        random.randrange(20, 90),
+        random.randrange(5, 16),
+        steps=16)
+
+    p2 = p.intersection(polygon.SphericalPolygon([]))
+
+    assert_array_almost_equal(p2._points, p._points)
+
+
 if __name__ == '__main__':
     if '--profile' not in sys.argv:
         GRAPH_MODE = True
diff --git a/stsci/sphere/test/test_union.py b/stsci/sphere/test/test_union.py
index b106907..24de9e6 100644
--- a/stsci/sphere/test/test_union.py
+++ b/stsci/sphere/test/test_union.py
@@ -214,3 +214,15 @@ if __name__ == '__main__':
     functions.sort()
     for k, v in functions:
         v()
+
+
+def test_union_empty():
+    p = polygon.SphericalPolygon.from_cone(
+        random.randrange(-180, 180),
+        random.randrange(20, 90),
+        random.randrange(5, 16),
+        steps=16)
+
+    p2 = p.union(polygon.SphericalPolygon([]))
+
+    assert_array_almost_equal(p2._points, p._points)