问题描述
我注意到 Python 中 assert_Called_once
和 assert_Called_once_with
的奇怪行为.这是我真正的简单测试:
I am noticing a weird behavior with assert_called_once
and assert_called_once_with
in python. This is my real simple test:
文件模块/a.py
from .b import B
class A(object):
def __init__(self):
self.b = B("hi")
def call_b_hello(self):
print(self.b.hello())
文件模块/b.py
class B(object):
def __init__(self, string):
print("created B")
self.string = string;
def hello(self):
return self.string
这些是我的测试:
import unittest
from mock import patch
from module.a import A
class MCVETests(unittest.TestCase):
@patch('module.a.B')
def testAcallBwithMockPassCorrect(self, b1):
a = A()
b1.assert_called_once_with("hi")
a.call_b_hello()
a.b.hello.assert_called_once()
@patch('module.a.B')
def testAcallBwithMockPassCorrectWith(self, b1):
a = A()
b1.assert_called_once_with("hi")
a.call_b_hello()
a.b.hello.assert_called_once_with()
@patch('module.a.B')
def testAcallBwithMockFailCorrectWith(self, b1):
a = A()
b1.assert_called_once_with("hi")
a.b.hello.assert_called_once_with()
@patch('module.a.B')
def testAcallBwithMockPassWrong(self, b1):
a = A()
b1.assert_called_once_with("hi")
a.b.hello.assert_called_once()
if __name__ == '__main__':
unittest.main()
我在函数名称中提到的问题是:
My problem as stated in the name of the function is:
- 测试 1 正确通过
- 测试 2 正确通过
- 测试 3 正确失败(我已删除对 b 的调用)
- 测试 4 通过了我不知道为什么.
我做错了吗?我不确定但正在阅读文档 docs python:
Am I doing something wrong? I am not sure but reading the documentation docs python:
assert_Called_once(*args, **kwargs)
断言模拟只被调用了一次.
Assert that the mock was called exactly once.
推荐答案
这是旧的,但对于其他人登陆这里...
This is old, but for others landing here...
对于 python <3.6,assert_Called_once
不是一回事,所以你实际上是在进行一个不会出错的模拟函数调用
For python < 3.6, assert_called_once
isn't a thing and so you're actually making a mocked function call which doesn't error
请参阅:http://engineroom.trackmaven.com/blog/mocking-mistakes/
您可以改为查看调用次数.
You can check the call count instead.
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