Drupal 8 Module Development - Second Edition

Mocked dependencies

Seldom are tested classes so simple as our calculator class. Most of the time, they will have dependencies that in turn also have dependencies. So unit testing becomes a bit more complicated. In fact, the ease with which unit tests are written has become a litmus test for the quality of the code being tested—the less complicated the unit test, the better the code.

As our second example of writing unit tests, let's go into the "real world" and test one of the classes we wrote in this book, namely, the UserTypesAccess class. If you remember from Chapter 10, Access Control, we created this service to be used on routes as an access checker. Although we can write functional tests that verify that it works well as part of the ...