python-asserton'；如果功能带有参数，则无法通过测试

assertRaises使用以下代码给出断言错误。我做错什么了吗

class File_too_small(Exception):
    "Check file size"

def foo(a,b):
    if a<b:
        raise File_too_small
class some_Test(unittest.TestCase):

    def test_foo(self):
        self.assertRaises(File_too_small,foo(1,2))

---

您需要将可调用而不是结果传递给assertRaises：

self.assertRaises(File_too_small, foo, 1, 2)

或者将其用作上下文管理器：

with self.assertRaises(File_too_small):
    foo(1, 2)

试着这样做：

def test_foo(self):
    with self.assertRaises(File_too_small):
        foo(1, 2)

或：

def test_foo(self):
    with self.assertRaises(File_too_small):
        foo(1, 2)

def test_foo(self):
    self.assertRaises(File_too_small, foo, 1, 2):