The testing framework in Drupal 8 (Testing module, previously SimpleTest).

Converting D7 SimpleTests to Drupal 8

Some notes on converting Drupal 7 SimpleTest-based tests to Drupal 8.

Simpletest Class, File, and Namespace structure

In Drupal 8, Simpletest tests have to have a specific namespace, file, and class structure in order to be recognized by the testing

Types of tests in Drupal 8

Unit, Kernel, Browser and Javascript tests. What are they?