This is a code repository and workshop guide for developers who write and maintain plugins for a popular CMS. It focuses on teaching how to write unit tests for plugin code without requiring a running instance of the CMS itself, which speeds up testing and improves reliability. The material is aimed at intermediate to advanced PHP developers looking to adopt test-driven development (TDD) practices for their plugin projects.

• Isolated Testing Setup: The guide explains how to configure PHPUnit and use mocking libraries like Brain Monkey to simulate CMS functions. This allows tests to run quickly and independently of a complex environment.
• Code Coverage Analysis: Instructions are included for generating code coverage reports, which help identify untested parts of the codebase and assess the risk of changes.
• Test-Driven Development Workflow: The workshop walks through a practical example of TDD, from writing a failing test to implementing the code that makes it pass, following the Arrange-Act-Assert pattern.
• Mocking External Dependencies: It provides concrete examples for mocking core CMS functions and hooks (actions and filters), which is essential for testing code that interacts with the CMS API.
• Docker Integration: For developers with different local environments, the repository includes examples of using Docker containers to ensure a consistent and isolated testing runtime.