unittest中的断言内容

Posted 2021-03-05 chongyou

unittest中包含了很多断言内容，实际用到的断言内容也就比对值是否相同，下面是unittest中的断言内容

#encoding=utf-8
import unittest
import random

# 被测试类
class MyClass(object):
    @classmethod
    def sum(self, a, b):
        return a + b

    @classmethod
    def div(self, a, b):
        return a / b

    @classmethod
    def retrun_None(self):
        return None

# 单元测试类
class MyTest(unittest.TestCase):

    # assertEqual()方法实例
    def test_assertEqual(self):
        # 断言两数之和的结果
        a, b = 1, 2
        sum = 4
        self.assertEqual(a + b, sum, ‘断言失败，%s + %s != %s‘ %(a, b, sum))


    # assertNotEqual()方法实例
    def test_assertNotEqual(self):
        # 断言两数之差的结果
        a, b = 5, 2
        res = 1
        self.assertNotEqual(a - b, res, ‘断言失败，%s - %s != %s‘ %(a, b, res))


    # assertTrue()方法实例
    def test_assertTrue(self):
        # 断言表达式的为真
        self.assertTrue(1 == 1, "表达式为假")


    # assertFalse()方法实例
    def test_assertFalse(self):
        self.assertFalse(3 == 2, "表达式为真")

    # assertIs()方法实例
    def test_assertIs(self):
        # 断言两变量类型属于同一对象，这事对比的地址，查看地址使用id（变量）
        a = 12
        b = a
        self.assertIs(a, b, "%s与%s不属于同一对象" %(a, b))

    # test_assertIsNot()方法实例
    def test_assertIsNot(self):
        # 断言两变量类型不属于同一对象
        a = 12
        b = "test"
        self.assertIsNot(a, b, "%s与%s属于同一对象" %(a, b))


    # assertIsNone()方法实例
    def test_assertIsNone(self):
        # 断言表达式结果为None
        result = MyClass.retrun_None()
        self.assertIsNone(result, "not is None")


    # assertIsNotNone()方法实例
    def test_assertIsNotNone(self):

        result = MyClass.sum(2, 5)
        self.assertIsNotNone(result, "is None")


    # assertIn()方法实例
    def test_assertIn(self):
        # 断言对象A是否包含在对象B中  ，这就是in的一个用法
        strA = "this is a test"
        strB = "is"
        self.assertIn(strB, strA, "%s不包含在%s中" %(strB, strA))

    # assertNotIn()方法实例
    def test_assertNotIn(self):
        strA = "this is a test"
        strB = "Selenium"
        self.assertNotIn(strB, strA, "%s包含在%s中" %(strB, strA))


    # assertIsInstance()方法实例
    def test_assertIsInstance(self):
        # 测试对象A的类型是否值指定的类型   
        x = MyClass
        y = object
        self.assertIsInstance(x, y, "%s的类型不是%s" %(x, y))


    # assertNotIsInstance()方法实例
    def test_assertNotIsInstance(self):
        # 测试对象A的类型不是指定的类型
        a = 123
        b = str
        self.assertNotIsInstance(a, b, "%s的类型是%s" %(a, b))


    # assertRaises()方法实例
    def test_assertRaises(self):
        # 测试抛出的指定的异常类型
        # assertRaises(exception)
        with self.assertRaises(TypeError) as cm:
            random.sample([1,2,3,4,5], "j")
        # 打印详细的异常信息
        self.assertRaises(ZeroDivisionError, MyClass.div, 3, 0)

    # assertRaisesRegexp()方法实例
    def test_assertRaisesRegexp(self):
        # 测试抛出的指定异常类型，并用正则表达式具体验证
        with  self.assertRaisesRegex(ValueError, ‘literal‘) as ar:
            int("xyz")
        # assertRaisesRegexp(exception, regexp, callable, *args, **kwds)
        self.assertRaisesRegex(ValueError, "invalid literal for.*XYZ‘$", int, ‘XYZ‘)


if __name__ == ‘__main__‘:
    # 执行单元测试
    unittest.main()

　　测试结果，运行14个，失败了1个，失败的结果显示