def test_fill_empty_string_with_with_empty_string_to_positive_should_return_spaces(self):
self.assertEqual(' ', fill('', '', 4))
def test_fill_empty_string_with_with_z_to_three_should_return_zzz(self):
self.assertEqual('zzz', fill('', 'z', 3))
def test_fill_empty_string_with_with_empty_string_to_zero_should_return_empty(self):
self.assertEqual('', fill('', '', 0))
