Talking Drupal #446 - Test Driven Development

April 15, 2024
Today we are talking about Test Driven Development, Why it’s important, and How it improves development with guest Alexey Korepov. We’ll also cover Test Helpers as our module of the week.


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  • What does the term Test Driven Development (TDD) mean
  • Does Drupal make use of TDD
  • What makes TDD different from other methods of Development
  • Do you have to change your way of thinking
  • What are some good resources to learn TDD
  • Do you have any pointers for teams looking to get started
  • Are certain kinds of projects better suited to TDD
  • How have dev teams adapted to TDD
  • Any advice on environment setup
  • Any special tools
  • Brief description:
    • Have you ever wanted an API that could dramatically simplify the process of writing Drupal unit tests? There’s a module for that.
  • Module name/project name:
  • Brief history
    • How old: created in Sep 2022 by today’s guest, Alexey Korepov
    • Versions available: 1.3.0 compatible with versions of Drupal 9.4 or newer, right up to Drupal 11
  • Maintainership
    • Actively maintained, latest release less than 3 months ago
    • Security coverage
    • Test coverage, would be ironic if it didn’t
    • API Documentation is available, linked from the project page
    • Number of open issues: 2 open issues, which are actually feature requests
  • Usage stats:
    • 5 sites officially, but modules or sites can leverage Test Helpers without enabling it, and this usage is recommended, so the number is actually higher
  • Module features and usage
    • Provides a new container that automated tests can leverage to perform common tasks with much less code.
    • For example, you can create a user or a node with a single line of code
    • You can also mock more complex operations like an entityQuery or loadMultiple call, again with a single line of code
    • Traditionally, writing unit tests is more complicated because by design they run without fully bootstrapping Drupal
    • That means that your test needs to mock functions or services in the code you’re testing which can result in units tests being much longer than the code they’re testing
    • Test Helpers also allows your tests to leverage existing mocks and stubs for popular services
    • The project page also links to the recording and slides for a talk Alexey gave about Test Helpers at DrupalCon Pittsburgh last year, if you want to do a deeper dive