app/tests/codeception/functional.suite.yml

# Codeception Test Suite Configuration
# suite for functional (integration) tests.
# emulate web requests and make application process them.
# (tip: better to use with frameworks).
# RUN `build` COMMAND AFTER ADDING/REMOVING MODULES.
#basic/web/index.php
class_name: FunctionalTester
modules:
    enabled:
      - Filesystem
      - Yii2
    config:
        Yii2:
            configFile: 'codeception/config/functional.php'