Slow tests can slow down your development process. Using parallel_tests, you can speed up your test suite by multiple threads and running the tests in groups.

In this episode, we look at adding system tests in our application to test our Stimulus Controllers. We'll also look at how to DRY up some of the tests and how to run them in a headless environment.

Using Continuous Integration, you can perform tasks and run your tests automatically whenever you commit your code. Travis CI offers free Continuous Integration for open source projects.

We continue from Episode 220 and add additional features and write tests for existing code. We look at introduced bugs and how test driven development can help to not only fix the bugs, but strengthen our test suite.

Continuing from the previous episode, we add testing to the Stripe Payments without adding any additional dependencies.