def test_CommaOperator():
expr = CommaOperator(PreIncrement(x), 2*x)
assert ccode(expr) == '(++(x), 2*x)'
assert expr.func(*expr.args) == expr
def test_PreIncrement():
p = PreIncrement(x)
assert p.func(*p.args) == p
assert ccode(p) == '++(x)'