yii composer install

tests/codeception/config/acceptance.php

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+<?php
+/**
+ * Application configuration for acceptance tests
+ */
+return yii\helpers\ArrayHelper::merge(
+    require(__DIR__ . '/../../../config/web.php'),
+    require(__DIR__ . '/config.php'),
+    [
+
+    ]
+);

tests/codeception/config/config.php

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+<?php
+/**
+ * Application configuration shared by all test types
+ */
+return [
+    'language' => 'en-US',
+    '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,
+        ],
+    ],
+];

tests/codeception/config/functional.php

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+<?php
+$_SERVER['SCRIPT_FILENAME'] = YII_TEST_ENTRY_FILE;
+$_SERVER['SCRIPT_NAME'] = YII_TEST_ENTRY_URL;
+
+/**
+ * Application configuration for functional tests
+ */
+return yii\helpers\ArrayHelper::merge(
+    require(__DIR__ . '/../../../config/web.php'),
+    require(__DIR__ . '/config.php'),
+    [
+        'components' => [
+            'request' => [
+                // it's not recommended to run functional tests with CSRF validation enabled
+                'enableCsrfValidation' => false,
+                // but if you absolutely need it set cookie domain to localhost
+                /*
+                'csrfCookie' => [
+                    'domain' => 'localhost',
+                ],
+                */
+            ],
+        ],
+    ]
+);

tests/codeception/config/unit.php

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+<?php
+/**
+ * Application configuration for unit tests
+ */
+return yii\helpers\ArrayHelper::merge(
+    require(__DIR__ . '/../../../config/web.php'),
+    require(__DIR__ . '/config.php'),
+    [
+
+    ]
+);