Testing for the Brave and True
summary
Drupal 8 testing is shown end-to-end: use PHPUnit and Behat for fast unit checks and slower browser tests, organize code into services and inject dependencies so classes are mockable, run UnitTestCase, KernelTestBase and WebTestBase from UnitTestCase/KernelTestBase/WebTestBase, and use a temporary sqlite test database so tests never touch production. A tiny calculator module demonstrates mocking with Prophecy, asserting method calls and edge cases, and running tests from a CLI script.
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