def METHOD_NAME(tmpdir):
    """Test saving and loading of a HexModelGrid."""
    with tmpdir.as_cwd():
        mg1 = HexModelGrid((3, 3), 1.0)
        mg1.add_zeros("topographic__elevation", at="node")
        save_grid(mg1, "testsavedgrid.grid")
        mg2 = load_grid("testsavedgrid.grid")
        assert mg1.x_of_node[0] == mg2.x_of_node[0]
        assert_array_equal(mg1.status_at_node, mg2.status_at_node)
        for name in mg1.at_node:
            assert_array_equal(mg1.at_node[name], mg2.at_node[name])