Python offers us unittest, an official unit testing framework for Python, sometimes referred as PyUnit. It's like a Python version of JUnit for Java and written by Kent Beck and Erich Gamma.
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For more information on how to use unittest, visit: http://docs.python.org/2/library/unittest.html
Currently the best package that helps us write Python unit tests is called sublime-unittest written by Samuel Martin, which can be found at https://github.com/martinsam/sublime-unittest.
Python's unittest for Sublime is a package that contains a number of useful snippets to ease our unittest writing. To install the package, we'll use Package Control. Let's open the command palette by pressing Ctrl + Shift + P in Windows or Linux and Command + Shift + P in OS X. Then choose Install Package and install the Unittest (python) package.
The installed package has two main snippets:
testclass: This will create a new test class for us to fill out
class [Foo...