def METHOD_NAME():
    ds = FieldDataset("node", fixed_size=True)
    ds.set_value("air_temperature", [0, 0, 0])
    ds.set_value("ground_temperature", [1, 1, 1])
    assert_array_equal(ds["air_temperature"], (0, 0, 0))
    assert_array_equal(ds["ground_temperature"], (1, 1, 1))
    assert len(ds) == 2
    assert sorted(ds) == ["air_temperature", "ground_temperature"]