def test_10(self): self.assertEqual(convert("blah"), -1)
def test_11(self): # Initially returned "None" # Case added self.assertEqual(convert(10), -1)
def test_8(self): self.assertEqual(convert("XXXXX"), -1)
def test_9(self): self.assertEqual(convert("LLCDD"), -1)
def test_6(self): self.assertEqual(convert("MMMMCMXCIX"), 4999)
def test_7(self): self.assertEqual(convert("IIV"), -1)
def test_5(self): # Failed: Syntax faulty self.assertEqual(convert("CD"), 399)
def test_4(self): # Failed: Test Cases missing self.assertEqual(convert("XC"), 90)
def test_3(self): self.assertEqual(convert("VI"), 6)
def test_2(self): self.assertEqual(convert("IV"), 4)
def test_1(self): self.assertEqual(convert("I"), 1)