def METHOD_NAME(tmpdir):
    grid = RasterModelGrid((4, 5), xy_spacing=(2.0, 2.0))
    grid.at_node["air__temperature"] = np.arange(20.0)
    with tmpdir.as_cwd():
        grid.at_node["land_surface__elevation"] = np.arange(20.0)
        files = write_esri_ascii("test.asc", grid)
        assert [os.path.basename(name) for name in sorted(files)] == [
            "test_air__temperature.asc",
            "test_land_surface__elevation.asc",
        ]
        assert sorted(os.listdir()) == sorted(files)