def test_13():
    assert nestParen("((yy())))") == False
def test_1():
    assert nestParen("((()))") == True
def test_10():
    assert nestParen("((y)))") == False
def test_12():
    assert nestParen("(())))") == False
def test_7():
    assert nestParen("(yy)") == False
def test_6():
    assert nestParen("") == True
def test_5():
    assert nestParen("()") == True
def test_4():
    assert nestParen("((()()") == False
def test_2():
    assert nestParen("(((x))") == False