def test_keyerror(self):
d = mydict.Dict()
with self.assertRaises(
KeyError): # 通过d['empty']访问不存在的key时，断言会抛出KeyError
value = d['empty']
def test_attrerror(self):
d = mydict.Dict()
with self.assertRaises(AttributeError):
value = d.empty
def test_key(self):
d = mydict.Dict(a=1, b='test')
self.assertEqual(d['a'], 1)
def test_attr(self):
d = mydict.Dict(a=1, b='test')
self.assertEqual(d.a, 1)
def test_init(self): # 测试方法必须以test开头
d = mydict.Dict(a=1, b='test')
self.assertEqual(d.a, 1) # 断言d.a == 1
self.assertEqual(d.b, 'test')
self.assertTrue(isinstance(d, dict)) # 断言 isinstance(d,dict) == True