diff --git a/tests/python/test_ColorSpace.py b/tests/python/test_ColorSpace.py
index 38ebb19848..6df46f854f 100644
--- a/tests/python/test_ColorSpace.py
+++ b/tests/python/test_ColorSpace.py
@@ -579,6 +579,12 @@ def test_display_referred(self, cfg, cs_name, expected_value):
             )
             self.assertEqual(is_linear_to_display_reference, expected_value)
 
+        # Test undefined color spaces.
+        with self.assertRaises(OCIO.Exception):
+            cfg.isColorSpaceLinear('colorspace_abc', OCIO.REFERENCE_SPACE_SCENE)
+        with self.assertRaises(OCIO.Exception):
+            cfg.isColorSpaceLinear('colorspace_abc', OCIO.REFERENCE_SPACE_DISPLAY)
+
         # Test the scene referred color spaces.
         test_scene_referred(self, cfg, "display_data", False)
         test_scene_referred(self, cfg, "display_linear-enc", False)