mock is a Python module that provides a core Mock class. It removes the need to create a host of stubs throughout your test suite. After performing an action, you can make assertions about which methods / attributes were used and arguments they were called with. You can also specify return values and set needed attributes in the normal way. The mock module also provides utility functions / objects to assist with testing, particularly monkey patching.
WWW: http://www.voidspace.org.uk/python/mock/
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