yii2-app-basic/tests/codeception/config/config.php

<?php
/**
 * Application configuration shared by all test types
 */
return [
    [
        'controllerMap' => [
            'fixture' => [
                'class' => 'yii\faker\FixtureController',
                'fixtureDataPath' => '@tests/codeception/fixtures',
                'templatePath' => '@tests/codeception/templates',
                'namespace' => 'tests\codeception\fixtures',
            ],
        ],
    ],
    'components' => [
        'db' => [
            'dsn' => 'mysql:host=localhost;dbname=yii2_basic_tests',
        ],
        'mailer' => [
            'useFileTransport' => true,
        ],
        'urlManager' => [
            'showScriptName' => true,
        ],
    ],
];