Hi there,
I announce a new plugin SublimePyunit for ST3 (not sure about ST2 since I don’t have it installed anymore), which assists python developers to write and run python unit tests 
. It can be installed from Package Control under the name “Python Unittest Helper” https://sublime.wbond.net/packages/Python%20Unittest%20Helper. It is a port from pyunit-vim and hope you like it.