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README-automated-testing.md

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Automated testing

Unit testing

The Drupal Rector project has PHPUnit tests, extending the testing suite functionality provided by Rector. This allows the project to have confidence in the written Rector rules. To run the unit tests, there are different system requirements than if you ran Drupal Rector against your Drupal site.

The developer dependencies require rector/rector-src which requires PHP 8.

To run the PHPUnit tests:

  • Clone your fork of the repository
  • Run composer install
  • Run php vendor/bin/phpunit

See the .github/workflows/phpunit.yml workflow for an example.

Writing a PHPUnit test

For now, please see the example in tests/src/Rector/Deprecation/DatetimeStorageTimezoneRector

Installation test

GitHub Action workflows test that this package can be installed. See the workflows in .github/workflows.

Rector functional testing

The functional test takes the rector_examples directory in this package and copies it to a Drupal code base.

The workflow then runs vendor/bin/rector process web/modules/custom/rector_examples to apply all of the appropriate Rector rules.

Then, the diff command is run to verify the changes match the expected results as found in the rector_examples_updated directory.

To add new tests, create a sample file in rector_examples and a copy with the expected changes into rector_examples_updated.