def METHOD_NAME(tmpdir):
    df = vaex.from_scalars(x=1, s='Hello')
    df.export_hdf5(tmpdir / 'this_is_hdf5.xyz')
    df = vaex.open(tmpdir / 'this_is_hdf5.xyz')
    assert df.x.tolist() == [1]
    assert df.s.tolist() == ['Hello']