Install the git hooks for this project by:
cd .git
rm -rf hooks
ln -s ../hooks .
You can run the test suite like this:
cfx test
In addition to running the tests, you should lint the code. To install jshint, simply npm install jshint from the root directory of the project. Then run like it like this:
./hooks/pre-commit
and make sure your changes are not adding any new warnings or errors.
Also keep an eye on the command line warnings and errors when running the extension via cfx run.