first commit

environments/dev/common/config/codeception-local.php

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+<?php
+
+return yii\helpers\ArrayHelper::merge(
+    require __DIR__ . '/main.php',
+    require __DIR__ . '/main-local.php',
+    require __DIR__ . '/test.php',
+    require __DIR__ . '/test-local.php',
+    [
+        'components' => [
+            'request' => [
+                // !!! insert a secret key in the following (if it is empty) - this is required by cookie validation
+                'cookieValidationKey' => '',
+            ],
+        ],
+    ]
+);

environments/dev/common/config/main-local.php

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+<?php
+
+return [
+    'components' => [
+        'db' => [
+            'class' => \yii\db\Connection::class,
+            'dsn' => 'mysql:host=localhost;dbname=yii2advanced',
+            'username' => 'root',
+            'password' => '',
+            'charset' => 'utf8',
+        ],
+        'mailer' => [
+            'class' => \yii\symfonymailer\Mailer::class,
+            'viewPath' => '@common/mail',
+            // send all mails to a file by default.
+            'useFileTransport' => true,
+            // You have to set
+            //
+            // 'useFileTransport' => false,
+            //
+            // and configure a transport for the mailer to send real emails.
+            //
+            // SMTP server example:
+            //    'transport' => [
+            //        'scheme' => 'smtps',
+            //        'host' => '',
+            //        'username' => '',
+            //        'password' => '',
+            //        'port' => 465,
+            //        'dsn' => 'native://default',
+            //    ],
+            //
+            // DSN example:
+            //    'transport' => [
+            //        'dsn' => 'smtp://user:pass@smtp.example.com:25',
+            //    ],
+            //
+            // See: https://symfony.com/doc/current/mailer.html#using-built-in-transports
+            // Or if you use a 3rd party service, see:
+            // https://symfony.com/doc/current/mailer.html#using-a-3rd-party-transport
+        ],
+    ],
+];

environments/dev/common/config/params-local.php

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+<?php
+
+return [
+];

environments/dev/common/config/test-local.php

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+<?php
+
+return [
+    'components' => [
+        'db' => [
+            'dsn' => 'mysql:host=localhost;dbname=yii2advanced_test',
+        ],
+    ],
+];