1. Install phpunit using composer:

   $ composer install
   

2. Check if the phpunit exist:

   $ vendor/bin/phpunit --version
   

3. Install WordPress and the WP Unit Test lib using the install.sh script. Change to the plugin root directory and type:

   $ tests/bin/install.sh <db-name> <db-user> <db-password> [db-host] [wp-version] [skip-database-creation]
   

Sample usage:

$ tests/bin/install.sh googlesitekit_tests root root localhost 4.9.8 false

If you don't have mysqladmin installed on your host, please use create database manually. And set skip-database-creation to true:

$ tests/bin/install.sh googlesitekit_tests root root localhost 4.9.8 true

Important: The <db-name> database will be created if it doesn't exist and all data will be removed during testing.

Simply change to the plugin root directory and type:

$ vendor/bin/phpunit

You can run specific tests by providing the path and filename to the test class:

$ vendor/bin/phpunit tests/unit-tests/helpers

You can run specific tests by providing group arguments:

$ vendor/bin/phpunit --group cache

Available Groups:

• helpers
• cache

Running with the WordPress Core PHPUnit configuration: $WP_TESTS_DIR=/path/to/wp/develop/phpunit vendor/bin/phpunit

Tests are automatically run with Travis-CI for each commit and pull request.