def test_equals_2(self): self.assertEqual(solution('IV'), 4)
def test_equals(self): self.assertEqual(solution('I'), 1)
def test_equals_4(self): self.assertEqual(solution('MMVIII'), 2008)
def test_equals_5(self): self.assertEqual(solution('MDCLXVI'), 1666)
def test_equals_3(self): self.assertEqual(solution('XXI'), 21)