class TestSuite(unittest.TestCase):

    def setup(self):

        pass;

    def tearDown(self):

        pass;

    def testAdd(self):

        res = add(100,4);

        self.assertEqual(res,104);

        self.assertEqual(add(-1,23),22);

    def testSub(self):

        res = sub(100,4);

        self.assertEqual(res,96);

        self.assertEqual(sub(23,32),0);

    def testMul(self):

        res = mul(100,4);

        self.assertEqual(res,400);

    def testDiv(self):

        res = div(100,4);

        self.assertEqual(res,25);

        self.assertEqual(div(1,0),0);

        self.assertEqual(div(2,0),1);

def suite():

    suite = unittest.TestSuite();

    suite.addTest(TestSuite("testAdd"));

    suite.addTest(TestSuite("testSub"));

    suite.addTest(TestSuite("testMul"));

    suite.addTest(TestSuite("testDiv"));

    return suite;

if __name__ == "__main__":

    unittest.main(defaultTest = 'suite')

（2）运行测试case

python case.py