diff --git a/apps/basic/commands/HelloController.php b/apps/basic/commands/HelloController.php
index b62e5bb..ce567dd 100644
--- a/apps/basic/commands/HelloController.php
+++ b/apps/basic/commands/HelloController.php
@@ -25,6 +25,6 @@ class HelloController extends Controller
 	 */
 	public function actionIndex($message = 'hello world')
 	{
-		echo $message."\n";
+		echo $message . "\n";
 	}
 }
diff --git a/apps/basic/config/web.php b/apps/basic/config/web.php
index 966458d..472f842 100644
--- a/apps/basic/config/web.php
+++ b/apps/basic/config/web.php
@@ -39,16 +39,14 @@ $config = [
 	'params' => $params,
 ];
 
-if (YII_ENV_DEV)
-{
+if (YII_ENV_DEV) {
 	// configuration adjustments for 'dev' environment
 	$config['preload'][] = 'debug';
 	$config['modules']['debug'] = 'yii\debug\Module';
 	$config['modules']['gii'] = 'yii\gii\Module';
 }
 
-if (YII_ENV_TEST)
-{
+if (YII_ENV_TEST) {
 	// configuration adjustments for 'test' environment.
 	// configuration for codeception test environments can be found in codeception folder.
 
diff --git a/apps/basic/tests/unit/_bootstrap.php b/apps/basic/tests/unit/_bootstrap.php
index d6d11e9..f37625b 100644
--- a/apps/basic/tests/unit/_bootstrap.php
+++ b/apps/basic/tests/unit/_bootstrap.php
@@ -2,7 +2,7 @@
 
 // add unit testing specific bootstrap code here
 
-yii\codeception\TestCase::$applicationConfig = yii\helpers\ArrayHelper::merge(
+yii\codeception\TestCase::$appConfig = yii\helpers\ArrayHelper::merge(
 	require(__DIR__ . '/../../config/web.php'),
 	require(__DIR__ . '/../../config/codeception/unit.php')
-);
\ No newline at end of file
+);
diff --git a/apps/basic/web/index-test-acceptance.php b/apps/basic/web/index-test-acceptance.php
index 224152b..ef9ec75 100644
--- a/apps/basic/web/index-test-acceptance.php
+++ b/apps/basic/web/index-test-acceptance.php
@@ -1,6 +1,6 @@
 <?php
 
-// NOTE: Make sure this file is not accessable when deployed to production
+// NOTE: Make sure this file is not accessible when deployed to production
 
 defined('YII_DEBUG') or define('YII_DEBUG', true);
 defined('YII_ENV') or define('YII_ENV', 'test');
@@ -13,5 +13,4 @@ $config = yii\helpers\ArrayHelper::merge(
 	require(__DIR__ . '/../config/codeception/acceptance.php')
 );
 
-$application = new yii\web\Application($config);
-$application->run();
+(new yii\web\Application($config))->run();
diff --git a/apps/basic/web/index.php b/apps/basic/web/index.php
index e9eeb33..006e28f 100644
--- a/apps/basic/web/index.php
+++ b/apps/basic/web/index.php
@@ -9,5 +9,4 @@ require(__DIR__ . '/../vendor/yiisoft/yii2/yii/Yii.php');
 
 $config = require(__DIR__ . '/../config/web.php');
 
-$application = new yii\web\Application($config);
-$application->run();
+(new yii\web\Application($config))->run();
diff --git a/extensions/yii/codeception/TestCase.php b/extensions/yii/codeception/TestCase.php
index e6809bc..34dc11d 100644
--- a/extensions/yii/codeception/TestCase.php
+++ b/extensions/yii/codeception/TestCase.php
@@ -3,7 +3,6 @@
 namespace yii\codeception;
 
 use Yii;
-use yii\helpers\ArrayHelper;
 
 /**
  * TestCase is the base class for all codeception unit tests
@@ -14,22 +13,18 @@ use yii\helpers\ArrayHelper;
 class TestCase extends \PHPUnit_Framework_TestCase
 {
 	/**
-	 * @var array|string Your application base config that will be used for creating application each time before test.
-	 * This can be an array or alias, pointing to the config file. For example for console application it can be
-	 * '@tests/unit/console_bootstrap.php' that can be similar to existing unit tests bootstrap file.
+	 * @var array the application configuration that will be used for creating an application instance for each test.
 	 */
-	public static $applicationConfig = '@app/config/web.php';
+	public static $appConfig = [];
 	/**
-	 * @var array|string Your application config, will be merged with base config when creating application. Can be an alias too.
+	 * @var string the application class that [[mockApplication()]] should use
 	 */
-	protected $config = [];
+	public static $appClass = 'yii\web\Application';
+
 
 	/**
-	 * Created application class
-	 * @var string
+	 * @inheritdoc
 	 */
-	protected $applicationClass = 'yii\web\Application';
-
 	protected function tearDown()
 	{
 		$this->destroyApplication();
@@ -37,20 +32,21 @@ class TestCase extends \PHPUnit_Framework_TestCase
 	}
 
 	/**
-	 * Sets up `Yii::$app`.
+	 * Mocks up the application instance.
+	 * @param array $config the configuration that should be used to generate the application instance.
+	 * If null, [[appConfig]] will be used.
+	 * @return \yii\web\Application|\yii\console\Application the application instance
 	 */
-	protected function mockApplication()
+	protected function mockApplication($config = null)
 	{
-		$baseConfig = is_array(static::$applicationConfig) ? static::$applicationConfig : require(Yii::getAlias(static::$applicationConfig));
-		$config = is_array($this->config)? $this->config : require(Yii::getAlias($this->config));
-		new $this->applicationClass(ArrayHelper::merge($baseConfig,$config));
+		return new static::$appClass($config === null ? static::$appConfig : $config);
 	}
 
 	/**
-	 * Destroys an application created via [[mockApplication]].
+	 * Destroys the application instance created by [[mockApplication]].
 	 */
 	protected function destroyApplication()
 	{
-		\Yii::$app = null;
+		Yii::$app = null;
 	}
 }