def test_example(): assert Parens(u')))(((') == -1
def test_equal_parens(): assert Parens(u"()") == 0
def test_equal_unmatched(): assert Parens(u")(") == -1
def test_combo_2(): assert Parens(u"(()") == 1
def test_combo(): assert Parens(u")(()))(") == -1
def test_many_equal(): assert Parens(u"(()(()))") == 0
def test_broken(): assert Parens(u")") == -1
def test_two_open(): assert Parens(u"((") == 1
def test_open(): assert Parens(u"(") == 1