def test_equals_3(self): self.assertEqual(mutate(self.zero, 0), self.zero)
def test_equals_4(self): self.assertEqual(mutate(self.one, 0), self.one)
def test_equals_2(self): self.assertEqual(mutate(self.one, 1), self.zero)
def test_equals_3(self): self.assertEqual(mutate(self.zero, 0), self.zero)
def test_equals_4(self): self.assertEqual(mutate(self.one, 0), self.one)
def test_equals_2(self): self.assertEqual(mutate(self.one, 1), self.zero)