Mock实现模拟python的对象

　　　　Mock库的应用

Mock在Python3.3之前是第三方库，需要安装 pip install Mock ；导入 import mock

Mock在Python3.3之后是Python标准库，导入方式为 from unittest import mock

Mock能够让我们模拟单元测试中不可用或繁重的资源；还可以模拟Python对象的行为

Mock 使用的原因：

　　一、环境由于客观原因由于无法搭建

　　二、搭建服务器的值需要大量工作才行

实现代码如下：

import requests
import shutil

def send_Mock(url):
    r = requests.get(url)
    return r.status_code

def visit_Mock():
    return send_Mock("http://www.Teacherketang.com/")

class Remove(object):
    def rmdir(self,path="E:/"):
        re = shutil.rmtree(path)
        if re == None:
            return "seccess"
        else:
            return "fail"

    def exists_get_rmdir(self):
        return self.rmdir()

调用模块

from Mock_Test import Client_Mock
import unittest
from unittest import mock

class Mock_Test(unittest.TestCase):

    def setUp(self):
        self.r = Client_Mock.Remove()

    def test_success_mock(self):
        success_mock = mock.Mock(return_value="200")
        Client_Mock.send_Mock = success_mock
        self.assertEqual(Client_Mock.visit_Mock(),"200")

    def test_fail_mock(self):
        fail_mock = mock.Mock(return_value="404")
        Client_Mock.send_Mock = fail_mock
        self.assertEqual(Client_Mock.visit_Mock(), "404")

    def test_remove_success(self):
        remove_success = mock.Mock(return_value="success")
        self.r.rmdir = remove_success
        self.assertEqual(self.r.exists_get_rmdir(),remove_success())

    def test_remove_fail(self):
        remove_fail = mock.Mock(return_value="fail")
        self.r.rmdir = remove_fail
        self.assertEqual(self.r.exists_get_rmdir(),remove_fail())

if __name__ == '__main__':
    unittest.main(verbosity=2)