def METHOD_NAME(load_test_data):
    """
    Ensure that a non existing username throws an error
    :param load_test_data: The fixture providing the test data (see :meth:`~tests.conftest.load_test_data`)
    :type load_test_data: tuple
    """
    with pytest.raises(CommandError) as exc_info:
        assert not any(
            get_command_output(
                "replace_links", "replace_links", "search", "--username=non-existing"
            )
        )
    assert str(exc_info.value) == 'User with username "non-existing" does not exist.'