Module Development

Write a Unit Test for Drupal 8, 9, and 10

Unit tests are the simplest among Drupal's test types, ideal for verifying code that performs computations. This tutorial guides through writing unit tests for the anytown module, focusing on the ForecastClient service, and illustrates how to use mocks for dependencies.

In this tutorial, we'll:

  • List potential unit tests for the anytown module.
  • Write tests for ForecastClient service logic.
  • Demonstrate how to mock services in unit tests.

By the end of this tutorial you should be able to write PHPUnit Unit tests for logic in the anytown module.

Drupal Module Developer Guide