Integration testing

Integration tests test the interaction between individual components, layers, and an environment. They can be found in the dev/tests/integration directory. Like unit tests, Magento also uses PHPUnit for integration tests. Thus, the difference between a unit and an integration test is not that much of a technical nature; rather, it's of a logical nature.

To specifically trigger integration tests only, we can execute the following command on the console:

php bin/magento dev:tests:run integration

When executed, Magento internally changes the directory to dev/tests/integration and executes a command that is similar to the following one:

php /Users/branko/www/magento2/./vendor/phpunit/phpunit/phpunit

The integration directory has its own phpunit.xml.dist file. Looking at its testsuite definition, we can see that it is pointing to all the Test.php suffixed files that are found in the dev/tests/integration/testsuite directory.