在Python2.7中使用修饰的方法调用发出模拟
此代码:在Python2.7中使用修饰的方法调用发出模拟,python,python-2.7,unit-testing,mocking,pytest,Python,Python 2.7,Unit Testing,Mocking,Pytest,此代码: import mock from functools import wraps def dec(f): @wraps(f) def f_2(*args, **kwargs): pass return f_2 class Example(object): def __init__(self): pass @dec def method_1(self, arg): pass d
import mock
from functools import wraps
def dec(f):
@wraps(f)
def f_2(*args, **kwargs):
pass
return f_2
class Example(object):
def __init__(self):
pass
@dec
def method_1(self, arg):
pass
def method_2(self, arg):
self.method_1(arg)
def test_example():
m = mock.create_autospec(Example)
Example.method_2(m, "hello")
m.method_1.assert_called_once_with("hello")
使用py.test生成此错误
def test_example():
m = mock.create_autospec(Example)
> Example.method_2(m, "hello")
example.py:26:
_ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _
example.py:20: in method_2
self.method_1(arg)
anaconda2/envs/arctic/lib/python2.7/site-packages/mock/mock.py:1061: in __call__
_mock_self._mock_check_sig(*args, **kwargs)
anaconda2/envs/arctic/lib/python2.7/site-packages/mock/mock.py:227: in checksig
sig.bind(*args, **kwargs)
anaconda2/envs/arctic/lib/python2.7/site-packages/mock/mock.py:95: in fixedbind
return self._bind(args, kwargs)
_ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _
self = <funcsigs.Signature object at 0x7f09b8685e10>, args = ('hello',), kwargs = {}, partial = False
def _bind(self, args, kwargs, partial=False):
'''Private method. Don't use directly.'''
arguments = OrderedDict()
parameters = iter(self.parameters.values())
parameters_ex = ()
arg_vals = iter(args)
if partial:
# Support for binding arguments to 'functools.partial' objects.
# See 'functools.partial' case in 'signature()' implementation
# for details.
for param_name, param in self.parameters.items():
if (param._partial_kwarg and param_name not in kwargs):
# Simulating 'functools.partial' behavior
kwargs[param_name] = param.default
while True:
# Let's iterate through the positional arguments and corresponding
# parameters
try:
arg_val = next(arg_vals)
except StopIteration:
# No more positional arguments
try:
param = next(parameters)
except StopIteration:
# No more parameters. That's it. Just need to check that
# we have no `kwargs` after this while loop
break
else:
if param.kind == _VAR_POSITIONAL:
# That's OK, just empty *args. Let's start parsing
# kwargs
break
elif param.name in kwargs:
if param.kind == _POSITIONAL_ONLY:
msg = '{arg!r} parameter is positional only, ' \
'but was passed as a keyword'
msg = msg.format(arg=param.name)
raise TypeError(msg)
parameters_ex = (param,)
break
elif (param.kind == _VAR_KEYWORD or
param.default is not _empty):
# That's fine too - we have a default value for this
# parameter. So, lets start parsing `kwargs`, starting
# with the current parameter
parameters_ex = (param,)
break
else:
if partial:
parameters_ex = (param,)
break
else:
msg = '{arg!r} parameter lacking default value'
msg = msg.format(arg=param.name)
raise TypeError(msg)
else:
# We have a positional argument to process
try:
param = next(parameters)
except StopIteration:
raise TypeError('too many positional arguments')
else:
if param.kind in (_VAR_KEYWORD, _KEYWORD_ONLY):
# Looks like we have no parameter for this positional
# argument
> raise TypeError('too many positional arguments')
E TypeError: too many positional arguments
anaconda2/envs/arctic/lib/python2.7/site-packages/funcsigs/__init__.py:716: TypeError
从mock 1.1.0开始,框架开始深入检查方法签名。请看一下 问题#17015:当它有一个规范时,模拟对象现在会在匹配调用时检查其签名,这样就可以按位置或名称匹配参数 现在,如果您将
f2()
签名更改为def_2(arg、*args、**kwargs)
它应该可以工作
也许这是一个新的bug,签名检查无法正确理解调用是否正确(至少兼容)。我想你可以提交一个bug并在这里发布ticket链接
作为解决方法,您可以通过添加从方法\u 1
中删除自动检测
m.method_1 = mock.Mock()
将
test\u example
包装到ExampleTest类中值得一试,但除非我遗漏了什么,否则需要实际实例化对象。i、 例如,我必须做一些类似于:m=Example()m.method_1=mock.mock()等的事情。假设我不想调用init,因为在这个非常重要的例子中,它非常昂贵,需要设置很多其他东西。这是使用autospec的最大“胜利”。
m.method_1 = mock.Mock()