from roundtrip import dedent


class TestDedent:
    def test_start_newline(self):
        x = dedent(
            """
        123
          456
        """
        )
        assert x == '123\n  456\n'

    def test_start_space_newline(self):
        # special construct to prevent stripping of following whitespac
        x = dedent(
            '   '
            """
        123
        """
        )
        assert x == '123\n'

    def test_start_no_newline(self):
        # special construct to prevent stripping of following whitespac
        x = dedent(
            """\
        123
          456
        """
        )
        assert x == '123\n  456\n'

    def test_preserve_no_newline_at_end(self):
        x = dedent(
            """
        123"""
        )
        assert x == '123'

    def test_preserve_no_newline_at_all(self):
        x = dedent(
            """\
        123"""
        )
        assert x == '123'

    def test_multiple_dedent(self):
        x = dedent(
            dedent(
                """
        123
        """
            )
        )
        assert x == '123\n'