def METHOD_NAME(self) -> None:
    """Test default warning message when deprecating arguments."""
    @_deprecate_arguments(version="xxx", deprecated_args={"a"})
    def dummy_deprecated_default_message(a: str = "a") -> None:
        pass
    # Default message
    with pytest.warns(FutureWarning) as record:
        dummy_deprecated_default_message(a="A")
    self.assertEqual(len(record), 1)
    self.assertEqual(
        record[0].message.args[0],
        "Deprecated argument(s) used in 'dummy_deprecated_default_message': a."
        " Will not be supported from version 'xxx'.",
    )