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    <p>You won't always find one to one equivalents of Ruby testing tools in Python, but there are some great testing tools in Python. Some of the tools that I've found useful include:</p> <ul> <li><a href="http://docs.python.org/library/unittest.html" rel="noreferrer">unittest</a> - the xUnit tool included in the Python standard library. It includes all the basics for unit testing. </li> <li><a href="http://docs.python.org/library/doctest.html" rel="noreferrer">doctest</a> - an awesome part of the standard library, it allows you to write tests in the docstrings of functions, classes, modules, methods. It is great at conveying intended API usage. <a href="http://blog.ianbicking.org/behavior-driven-programming.html" rel="noreferrer">Ian Bicking</a> suggests using doctest for Behavior Driven Development. Doctest fits very well into the <a href="http://sphinx.pocoo.org/" rel="noreferrer">Sphinx</a> documentation system (you can make sure all the examples in your documentation pass every time you build the docs).</li> <li><a href="http://somethingaboutorange.com/mrl/projects/nose/" rel="noreferrer">nose</a> and <a href="http://codespeak.net/py/dist/test/" rel="noreferrer">py.test</a> are seen as the next-gen versions of unittest. They can run all existing unittest cases, but allow for easier, non-class based unit tests. py.test also allows for distributed execution.</li> <li><a href="http://www.voidspace.org.uk/python/mock.html" rel="noreferrer">mock</a> is a nice library for mocking behavior.</li> <li><a href="http://github.com/brunobord/tdaemon" rel="noreferrer">tdaemon</a> watches a directory for updates to your code and will re-execute your test suite. (my <a href="http://github.com/johnpaulett/tdaemon" rel="noreferrer">personal branch</a> contains a few unmerged improvements).</li> <li><a href="http://buildbot.net/" rel="noreferrer">Buildbot</a>, <a href="http://bitten.edgewall.org/" rel="noreferrer">Bitten</a>, and even <a href="http://hudson-ci.org/" rel="noreferrer">Hudson</a> all work well as full-fledged continuous integration servers for Python code. </li> <li><a href="http://nedbatchelder.com/code/coverage/" rel="noreferrer">coverage.py</a> computes the code coverage of your code.</li> <li><a href="http://www.logilab.org/857" rel="noreferrer">pylint</a> will provide a lint-like analysis of your code, making sure it follows common coding conventions and does not have any common bugs. There is also a "lighter" analysis tool, <a href="http://divmod.org/trac/wiki/DivmodPyflakes" rel="noreferrer">PyFlakes</a>.</li> <li>There are a number of HTTP / Browser testing tools that work well in Python, including <a href="http://twill.idyll.org/python-api.html" rel="noreferrer">Twill</a>, <a href="http://seleniumhq.org/" rel="noreferrer">Selenium</a>, and <a href="http://www.getwindmill.com/" rel="noreferrer">Windmill</a>.</li> </ul> <p>If you are using Django on App Engine, it includes <a href="http://docs.djangoproject.com/en/dev/topics/testing/" rel="noreferrer">several extensions</a> to unittest that allow you simulate an HTTP client and database persistence.</p> <p>There are a ton of other tools that I have not used (such as <a href="http://www.codeplex.com/pyspec/" rel="noreferrer">PySpec</a> and <a href="http://pypi.python.org/pypi/Behaviour" rel="noreferrer">Behaviour</a>) that could also be helpful. I haven't seen any mutation testing tool in Python, but I bet there is one out there (I would love to learn what it is).</p> <p>Happy testing!</p>
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    1. POHow do I go about setting up a TDD development process with Google App Engine?
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    1. USJohn Paulett
    1. USJohn Paulett
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    1. COFavoriting this question solely for this answer
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      1. UST. Stone
    2. COA lot of fantastic links here. I'm guessing a lot of these aren't drop-in for GAE though. I'd love to see more answers detailing how they got things integrated with GAE's development environment, particularly with the OS X launcher.
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      1. USBob Aman
    3. COBob, John's answer is excellent indeed. As I said just below, once you install the NoseGAE plugin for Nose it's pretty much smooth sailing with all of these tools.
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