def test_ImageDict_returns_true_if_key_exists(self):
d = ImageDict()
obj = cv2.imread(path.join(_this_path, 'data', 'object.png'))
mask = cv2.imread(path.join(_this_path, 'data', 'object_mask.png'))
d[obj, mask] = 1
self.assertTrue(d.__contains__((obj, mask)))
self.assertTrue((obj, mask) in d)
self.assertTrue(d.has_key((obj, mask)))
