[英]How to assert that a method is decorated with python unittest?
I have a decorator and I want to assert that certain methods in my code are decorated with it.我有一个装饰器,我想断言我代码中的某些方法是用它装饰的。
import functools
def decorator(func):
def _check_something(*args, **kwargs):
# some logic in here
return func(*args, **kwargs)
return functools.wraps(func)(_check_something)
class MyClass(object):
@decorator
def my_method(foo, bar):
pass
How do I assert with unittest (unitttest2) that my_method
has @decorator
and no-one removed it, and it was not forgotten?我如何用 unittest (unitttest2) 断言
my_method
有@decorator
并且没有人删除它,而且它没有被遗忘?
If for some reason you can't modify the decorator, you could also try checking for some characteristic of a closed variable.如果由于某种原因您无法修改装饰器,您也可以尝试检查封闭变量的某些特征。
In your example, you know that the original my_method
is the only variable closed by the decorator, so you could:在您的示例中,您知道原始
my_method
是装饰器关闭的唯一变量,因此您可以:
assert (my_method.__closure__ and
my_method.__closure__[0].cell_contents.__name__ == my_method.__name__)
You can do that by relying on your decorator to mark the wrapper function with an attribute, that you then assert.您可以依靠您的装饰器使用一个属性标记包装器 function 来做到这一点,然后您声明该属性。
A good practice is to have the decorator set a __wrapped__ attribute pointing to the original function on the returned wrapper.一个好的做法是让装饰器在返回的包装器上设置一个指向原始 function 的__wrapped__属性。
thus:因此:
def decorator(func):
@functools.wraps(func)
def _check_something(*args, **kwargs):
# some logic in here
return func(*args, **kwargs)
_check_something.__wrapped__ = func # <== add this
return _check_something
and then, on your test code:然后,在您的测试代码上:
assert getattr(MyClass.my_method, "__wrapped__").__name__ == 'my_method'
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