In this chapter, we have learned about unit testing, web or functional testing with the SimpleTest framework, and how to write tests for own custom Drupal code. To learn even more about what you can and can't do with SimpleTest test cases in Drupal, I recommend reading through the SimpleTest source code, specifically the classes defined in the
drupal_web_test_case.php file. The code is very well documented, and available in any Drupal 7 install.
In the next chapter, we are going to take a look at another useful tool for developing and managing configuration between sites—the Features module.