PHPUnit Test

PHPUnit is the official testing framework chosen by the WordPress Core team to perform automated unit testing for PHP code. You can learn how to get started and run tests with it from the below resources –

• Getting Started with PHPUnit
• Setup and Run PHPUnit
• Writing PHP Tests
• Unit Tests for WordPress Plugins
• Unit Tests for WordPress Plugins – Tests vs. Assertions

Using WP-CLI

• Generates files needed for running PHPUnit tests in a plugin
• Generates files needed for running PHPUnit tests in a theme.