Adding log from Yii to artifacts when test fails

src/Codeception/Lib/Connector/Yii2.php

@@ -261,7 +261,7 @@ public function createUrl($params)
         return is_array($params) ?$this->getApplication()->getUrlManager()->createUrl($params) : $params;
     }
 
-    public function startApp()
+    public function startApp(\yii\log\Logger $logger = null)
     {
         codecept_debug('Starting application');
         $config = require($this->configFile);
@@ -278,7 +278,12 @@ public function startApp()
         $config = $this->mockMailer($config);
         /** @var \yii\web\Application $app */
         Yii::$app = Yii::createObject($config);
-        Yii::setLogger(new Logger());
+
+        if ($logger !== null) {
+            Yii::setLogger($logger);
+        } else {
+            Yii::setLogger(new Logger());
+        }
     }
 
     /**

src/Codeception/Lib/Connector/Yii2/Logger.php

@@ -5,6 +5,23 @@
 
 class Logger extends \yii\log\Logger
 {
+    /**
+     * @var \SplQueue
+     */
+    private $logQueue;
+
+    /**
+     * @var int
+     */
+    private $maxLogItems;
+
+    public function __construct($maxLogItems = 5, $config = [])
+    {
+        parent::__construct($config);
+        $this->logQueue = new \SplQueue();
+        $this->maxLogItems = $maxLogItems;
+    }
+
     public function init()
     {
         // overridden to prevent register_shutdown_function
@@ -28,6 +45,27 @@ public function log($message, $level, $category = 'application')
             $message = $message->__toString();
         }
 
-        Debug::debug("[$category] " .  \yii\helpers\VarDumper::export($message));
+        $logMessage = "[$category] " . \yii\helpers\VarDumper::export($message);
+
+        Debug::debug($logMessage);
+
+        $this->logQueue->enqueue($logMessage);
+        if ($this->logQueue->count() > $this->maxLogItems) {
+            $this->logQueue->dequeue();
+        }
+    }
+
+    /**
+     * @return string
+     */
+    public function getAndClearLog()
+    {
+        $completeStr = '';
+        foreach ($this->logQueue as $item) {
+            $completeStr .= $item . PHP_EOL;
+        }
+        $this->logQueue = new \SplQueue();
+
+        return $completeStr;
     }
 }

src/Codeception/Module/Yii2.php

@@ -206,6 +206,11 @@ class Yii2 extends Framework implements ActiveRecord, MultiSession, PartedModule
      */
     private $server;
 
+    /**
+     * @var Yii2Connector\Logger
+     */
+    private $yiiLogger;
+
     public function _initialize()
     {
         if ($this->config['transaction'] === null) {
@@ -227,7 +232,8 @@ protected function onReconfigure()
         parent::onReconfigure();
         $this->client->resetApplication();
         $this->configureClient($this->config);
-        $this->client->startApp();
+        $this->yiiLogger->getAndClearLog();
+        $this->client->startApp($this->yiiLogger);
     }
 
     /**
@@ -312,7 +318,8 @@ protected function recreateClient()
     public function _before(TestInterface $test)
     {
         $this->recreateClient();
-        $this->client->startApp();
+        $this->yiiLogger = new Yii2Connector\Logger();
+        $this->client->startApp($this->yiiLogger);
 
         $this->connectionWatcher = new Yii2Connector\ConnectionWatcher();
         $this->connectionWatcher->start();
@@ -379,6 +386,16 @@ public function _after(TestInterface $test)
         parent::_after($test);
     }
 
+    public function _failed(TestInterface $test, $fail)
+    {
+        $log = $this->yiiLogger->getAndClearLog();
+        if (! empty($log)) {
+            $test->getMetadata()->addReport('yii-log', $log);
+        }
+
+        parent::_failed($test, $fail);
+    }
+
     protected function startTransactions()
     {
         if ($this->config['transaction']) {