def test_equals_2(self): self.assertEqual(solution(4), "IV")
def test_equals(self): self.assertEqual(solution(1), "I")
def test_equals_3(self): self.assertEqual(solution(6), "VI")
def test_equals_2(self): self.assertEqual(solution(4), 'IV')
def test_equals(self): self.assertEqual(solution(1), 'I')
def test_equals_3(self): self.assertEqual(solution(6), 'VI')