diff --git a/src/tests/testEngine.py b/src/tests/testEngine.py
--- a/src/tests/testEngine.py
+++ b/src/tests/testEngine.py
@@ -125,10 +125,12 @@ class TestTransitions(TestCase):
 
 			for k in range(1,4):
 				toMove=B
-				for (s1,s2) in zip(states,states[k:]):
+				for (i,(s1,s2)) in enumerate(zip(states,states[k:])):
 					diff=s2-s1
 					eng.load(s1,diff)
-					seq=eng.iterativelyDeepen(s2,toMove)
+					colorIn=W if i&1 else B
+					colorOut=colorIn if k&1 else 1-colorIn
+					seq=eng.iterativelyDeepen(s2,colorIn,colorOut)
 					msg="\n"+s1.exportDiff(s2)
 					self.assertIsNotNone(seq,msg)
 					self.assertLessEqual(len(seq),k,msg)