See also...

• Refer to the PHPUnit manual at https://phpunit.de/manual/4.8/en/writing-tests-for-phpunit.html.
• Refer to the Drupal PHPUnit handbook at https://drupal.org/phpunit.
• Refer to Running tests from the command line at https://www.drupal.org/node/645286.

• Refer to Commerce 2.x: Unit, Kernel, and Functional Tests Oh My! Authors blog post and tutorial for running tests in Drupal 8 for Drupal Commerce at https://drupalcommerce.org/blog/45322/commerce-2x-unit-kernel-and-functional-tests-oh-my.