7.3、单元测试

class Dict(dict):

    def __init__(self, **kw):
        super().__init__(**kw)

    def __getattr__(self, key):
        try:
            return self[key]
        except KeyError:
            raise AttributeError(r"'Dict' object has no attribute '%s'" % key)

    def __setattr__(self, key, value):
        self[key] = value

import unittest

from mydict import Dict

class TestDict(unittest.TestCase):

    def test_init(self):
        d = Dict(a=1, b='test')
        self.assertEqual(d.a, 1)
        self.assertEqual(d.b, 'test')
        self.assertTrue(isinstance(d, dict))

    def test_key(self):
        d = Dict()
        d['key'] = 'value'
        self.assertEqual(d.key, 'value')

    def test_attr(self):
        d = Dict()
        d.key = 'value'
        self.assertTrue('key' in d)
        self.assertEqual(d['key'], 'value')

    def test_keyerror(self):
        d = Dict()
        with self.assertRaises(KeyError):
            value = d['empty']

    def test_attrerror(self):
        d = Dict()
        with self.assertRaises(AttributeError):
            value = d.empty

    def __setattr__(self,key,value):            #运行单元测试
        self[key]=value

的setUp()和tearDown()方法。这两个方法会分别在每调用一个测试方法的前后分别被执行。

在setUp()方法中连接数据库，在tearDown()方法中关闭数据库，这样，不必在每个测试方法中重复相同的代码

class TestDict(unittest.TestCase):

    def setUp(self):
        print('setUp...')

    def tearDown(self):
        print('tearDown...')