def METHOD_NAME():
    root = wt.Collection(name="root")
    one = wt.Collection(name="one", parent=root)
    wt.Collection(name="two", parent=one)
    p = os.path.join(here, "nested")
    p = one.save(p)
    assert os.path.isfile(p)
    assert p.endswith(".wt5")
    new = wt.open(p)
    for k, v in one.attrs.items():
        assert_equal(new.attrs[k], v)
    for k, v in one.items():
        assert_equal(new[k], v)
    root.close()
    new.close()
    os.remove(p)