Clone the repository, and run make init.
Run make test to run the tests. Run coverage report (in the context of the p3_7env virtual environment) to see test coverage metrics.
To run the build for testing purposes during development, run make dev. This will start a development server listening on 127.0.0.1:5000. Use ctrl C to stop the server. The development server will watch the source files and automatically reload changes, so you don't have to manually restart every time you change something (although if something isn't working, that's still a good strategy).