def test_standardise_string_none(self):
        # GIVEN
        string = None

        # WHEN
        expected = None
        actual = standardise_string(string)

        # THEN
        self.assertEqual(expected, actual)
    def test_standardise_string_quotes(self):
        # GIVEN
        string = "'x'"

        # WHEN
        expected = '"x"'
        actual = standardise_string(string)

        # THEN
        self.assertEqual(expected, actual)