def test_split_whitespace(self):
        assert split_command_line('a b') == ['a', 'b']
        assert split_command_line('a\tb') == ['a', 'b']
        assert split_command_line('a\rb') == ['a', 'b']
        assert split_command_line('a\nb') == ['a', 'b']
        assert split_command_line('a   \tb') == ['a', 'b']