def _test_diff_date(self, d1, d2, same):
diff = AsTextDiff(DummyType(d1), DummyType(d2), "date")
self.assertTrue(IDifference.providedBy(diff))
self.assertEqual(diff.same, same)
inline_diff = diff.inline_diff()
if same:
self.assertFalse(inline_diff)
else:
self.assertTrue(inline_diff)
if d1 is not None:
self.assertTrue(str(d1) in inline_diff)
if d2 is not None:
self.assertTrue(str(d2) in inline_diff)
