def test_equals(self): self.assertEqual(vector_length([[0, 1], [0, 0]]), 1)
def test_equals_2(self): self.assertEqual(vector_length([[0, 3], [4, 0]]), 5)
def test_equals_3(self): self.assertEqual(vector_length([[1, -1], [1, -1]]), 0)
def test_equals(self): self.assertEqual(vector_length([[0, 1], [0, 0]]), 1)
def test_equals_2(self): self.assertEqual(vector_length([[0, 3], [4, 0]]), 5)
def test_equals_3(self): self.assertEqual(vector_length([[1, -1], [1, -1]]), 0)