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Mockito is a spying framework originally based on the Java library with the same name.
Use
from mockito import when, mock, unstub when(os.path).exists('/foo').thenReturn(True) # or: import requests # the famous library # you actually want to return a Response-like obj, we'll fake it response = mock({'status_code': 200, 'text': 'Ok'}) when(requests).get(...).thenReturn(response) # use it requests.get('http://google.com/') # clean up unstub()
Features
Super easy to set up different answers.
# Well, you know the internet when(requests).get(...).thenReturn(mock({'status': 501})) \ .thenRaise(Timeout("I'm flaky")) \ .thenReturn(mock({'status': 200, 'text': 'Ok'}))
State-of-the-art, high-five argument matchers:
# Use the Ellipsis, if you don't care when(deferred).defer(...).thenRaise(Timeout) # Or **kwargs from mockito import kwargs # or KWARGS when(requests).get('http://my-api.com/user', **kwargs) # The usual matchers from mockito import ANY, or_, not_ number = or_(ANY(int), ANY(float)) when(math).sqrt(not_(number)).thenRaise( TypeError('argument must be a number'))
No need to verify (assert_called_with) all the time:
# Different arguments, different answers when(foo).bar(1).thenReturn(2) when(foo).bar(2).thenReturn(3) # but: foo.bar(3) # throws immediately: unexpected invocation # because of that you just know that when # you get a `2`, you called it with `1`
Signature checking:
# when stubbing when(requests).get() # throws immediately: TypeError url required # when calling request.get(location='http://example.com/') # TypeError
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