PHPUnit

Automated testing is often viewed as a “nice to have” in Drupal development—something teams plan to implement “when there’s time.” But treating testing as optional is a costly mistake. The reality is that automated testing is fundamental to building maintainable Drupal applications, reducing bugs, and enabling teams to refactor and upgrade with confidence.

This guide will walk you through the essentials of automated testing in Drupal, from basic concepts to practical implementation, helping you build a testing practice that actually fits into your development workflow.