Fudge is a module for replacing real objects with fakes (mocks, stubs, etc) while testing.
Documentation is available at http://farmdev.com/projects/fudge/ or else, you can build it from source like this:
$ easy_install Sphinx $ cd docs $ make html
then open _build/html/index.html in your web browser.
To run tests, you need Sphinx and Nose:
$ easy_install Sphinx nose $ ./run_tests.sh