reset logger after unit test added

tests/TestCase.php

@@ -23,8 +23,7 @@ abstract class TestCase extends \PHPUnit\Framework\TestCase
     public static function tearDownAfterClass()
     {
         parent::tearDownAfterClass();
-        $logger = Yii::getLogger();
-        $logger->flush();
+        Yii::setLogger(null);
     }
 
     /**
@@ -58,7 +57,7 @@ abstract class TestCase extends \PHPUnit\Framework\TestCase
      * @param array $config The application configuration, if needed
      * @param string $appClass name of the application class to create
      */
-    protected function mockApplication($config = [], $appClass = '\yii\console\Application')
+    protected function mockApplication($config = [], $appClass = \yii\console\Application::class)
     {
         new $appClass(ArrayHelper::merge([
             'id' => 'testapp',
@@ -67,7 +66,7 @@ abstract class TestCase extends \PHPUnit\Framework\TestCase
         ], $config));
     }
 
-    protected function mockWebApplication($config = [], $appClass = '\yii\web\Application')
+    protected function mockWebApplication($config = [], $appClass = \yii\web\Application::class)
     {
         new $appClass(ArrayHelper::merge([
             'id' => 'testapp',
@@ -102,10 +101,10 @@ abstract class TestCase extends \PHPUnit\Framework\TestCase
      */
     protected function destroyApplication()
     {
-        if (\Yii::$app && \Yii::$app->has('session', true)) {
-            \Yii::$app->session->close();
+        if (Yii::$app && Yii::$app->has('session', true)) {
+            Yii::$app->session->close();
         }
-        \Yii::$app = null;
+        Yii::$app = null;
     }
 
     /**
@@ -188,7 +187,6 @@ abstract class TestCase extends \PHPUnit\Framework\TestCase
         return $result;
     }
 
-
     /**
      * Asserts that value is one of expected values.
      *