tweaks

tests/test_flip_image.py

@@ -15,7 +15,3 @@ class FlipImageTestCase(unittest.TestCase):
         # the code fails for 1D array
         with self.assertRaises(AssertionError):
             flip_image(np.array([1, 2, 3, 4]))
-
-
-if __name__ == "__main__":
-    unittest.main()