All tests are located within
/tests. Each pull request gets validated through Travis by running those tests
gulp tests. You can also run this command on your local computer considering you followed the
test.header.js test.footer.js test.content.typography.js test.content.wysiwyg.js ...
The success of your project does not depend on the tests or the percentage of your code coverage. Yet it will improve maintanance and further development for you and other contributors. We should “Aim for the highest” possible test coverage.