def test_get_free_symbols(): s = ["NonzeroQ", ["Plus", "m", "1"]] symbols = ["m", "x"] assert get_free_symbols(s, symbols, []) == ["m"]
def test_get_free_symbols(): s = ['NonzeroQ', ['Plus', 'm', '1']] symbols = ['m', 'x'] assert get_free_symbols(s, symbols, []) == ['m']