def test_consecutive_closed():
s = Solution()
assert 4 == s.longestValidParentheses("(())))(())")
def test_simple_closed_start_():
s = Solution()
assert 2 == s.longestValidParentheses(")()")
def test_remaining_closed():
s = Solution()
assert 4 == s.longestValidParentheses(")()())")
def test_nested():
s = Solution()
assert 6 == s.longestValidParentheses("()(())")
def test_empty():
s = Solution()
assert 0 == s.longestValidParentheses("")
def test_remaining_open():
s = Solution()
assert 4 == s.longestValidParentheses("(()()(")
def test_interrupted_closed():
s = Solution()
assert 2 == s.longestValidParentheses("())()(")
def test_interrupted_open():
s = Solution()
assert 2 == s.longestValidParentheses("()(()(")
def test_simple_open_start():
s = Solution()
assert 2 == s.longestValidParentheses("(()")