Drupalcamp Simpletest

The document introduces automated testing in Drupal, noting that SimpleTest is the PHP testing framework integrated into Drupal core to write automated tests. Automated testing is important as it defines expected code behavior, makes development and refactoring easier, and helps prevent regressions by verifying code changes don't break existing functionality. Tests are written as PHP files containing test classes that extend SimpleTest and use helper methods to simulate user actions and check site behavior.