def test_ones_nine(self):
     self.assertEqual("IX", ones(9, ""))
 def test_ones_six(self):
     self.assertEqual("VI", ones(6, ""))
 def test_ones_four(self):
     self.assertEqual("IV", ones(4, ""))
 def test_ones_five(self):
     self.assertEqual("V", ones(5, ""))
 def test_ones_one(self):
     self.assertEqual("I", ones(1, ""))