def test_empty():
s = ""
assert parenthetics.parens(s) == 0
def test_broken():
s = "()(q))"
assert parenthetics.parens(s) == -1
def test_broken2():
s = ")))(y(("
assert parenthetics.parens(s) == -1
def test_balanced2():
s = "(((klmn)))k()((p))"
assert parenthetics.parens(s) == 0
def test_balanced():
s = "()()()"
assert parenthetics.parens(s) == 0
def test_open2():
s = "((c(ab()d"
assert parenthetics.parens(s) == 1
def test_open():
s = "("
assert parenthetics.parens(s) == 1
def test_no_parens():
s = 'no parens'
assert parenthetics.parens(s) == 0
