The Hello X client uses Travis CI for continuous integration of testing. (Note, however, that it does not use continuous delivery. This would be easy to add but has little value at present.) Changes should be committed on a non-master branch, then a pull request should be made to pull them into the master branch. You may need to wait 5-10 minutes and/or refresh before the result of the Travis test run appears on the pull request page. If the tests pass, pull the changes into master; if not, add new commits fixing the errors, and repeat the aforementioned steps. Do not, except in the most dire circumstances, accept a pull request into master if tests are failing.