def METHOD_NAME(self):
    assert unicodeify("Li3Fe2(PO4)3") == "Li₃Fe₂(PO₄)₃"
    with pytest.raises(ValueError, match="unicode character exists for subscript period"):
        unicodeify("Li0.2Na0.8Cl")
    assert unicodeify_species("O2+") == "O²⁺"
    assert unicodeify_spacegroup("F-3m") == "F3̅m"