Running Simpletest and PHPUnit
Drupal 8 ships with two testing suites. Previously Drupal only supported Simpletest. Now there are PHPUnit tests as well. In the official change record, PHPUnit was added to provide testing without requiring a full Drupal bootstrap, which occurs with each Simpletest test. Read the change record here: https://www.drupal.org/node/2012184.
Getting ready
Currently core comes with Composer dependencies prepackaged and no extra steps need to be taken to run PHPUnit. This recipe will demonstrate how to run tests the same way that the QA testbot on Drupal.org does.
Note
The process of managing Composer dependencies may change, but is currently postponed due to Drupal.org's testing and packaging infrastructure. Read more here ...
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