Fix equality check in TVTK-related test (#352)

Closes #305.

Ideally we'd install Mayavi into the test environment in the test
workflows, but I think that's too much of a maintenance risk. It would
be even better to find a way to remove the TVTK-specific specializations
altogether.

apptools/persistence/tests/test_state_pickler.py

@@ -251,7 +251,9 @@ def verify_state(self, state1, state):
             ).__metadata__["id"]
 
         if TVTK_AVAILABLE:
-            self.assertEqual(state1._tvtk, state._tvtk)
+            # Some of the values are NumPy arrays, so use NumPy's
+            # assert_equal instead of the unittest assertEqual.
+            numpy.testing.assert_equal(state1._tvtk, state._tvtk)
 
         state1.tuple[-1].__metadata__["id"] = state.tuple[-1].__metadata__[
             "id"

docs/releases/upcoming/352.bugfix.rst

@@ -0,0 +1 @@
+Fix a test that was broken in the presence of Mayavi / TVTK. (#352)