diff --git a/src/http/ErrorHandler.php b/src/http/ErrorHandler.php
index a85f5518..61072954 100644
--- a/src/http/ErrorHandler.php
+++ b/src/http/ErrorHandler.php
@@ -86,9 +86,7 @@ public function clearOutput(): void
 
         while ($currentLevel > $minLevel) {
             if (@ob_end_clean() === false) {
-                // @codeCoverageIgnoreStart
                 ob_clean();
-                // @codeCoverageIgnoreEnd
             }
 
             $currentLevel = ob_get_level();
diff --git a/tests/http/stateless/ApplicationErrorHandlerTest.php b/tests/http/stateless/ApplicationErrorHandlerTest.php
index b8a1099e..bbe500f8 100644
--- a/tests/http/stateless/ApplicationErrorHandlerTest.php
+++ b/tests/http/stateless/ApplicationErrorHandlerTest.php
@@ -346,6 +346,80 @@ static function ($errno, $errstr, $errfile, $errline) use (&$warningsCaptured):
         }
     }
 
+    /**
+     * @throws InvalidConfigException if the configuration is invalid or incomplete.
+     */
+    #[RequiresPhpExtension('runkit7')]
+    public function testRenderExceptionSetsDisplayErrorsInDebugMode(): void
+    {
+        @\runkit_constant_redefine('YII_ENV_TEST', false);
+
+        $bufferBeforeLevel = ob_get_level();
+
+        $_SERVER = [
+            'REQUEST_METHOD' => 'GET',
+            'REQUEST_URI' => 'site/trigger-exception',
+        ];
+
+        ob_start();
+        echo 'buffer content that should be cleared';
+        ob_start();
+        echo 'nested buffer content';
+
+        $originalDisplayErrors = ini_get('display_errors');
+
+        $app = $this->statelessApplication(
+            [
+                'components' => [
+                    'errorHandler' => [
+                        'discardExistingOutput' => true,
+                        'errorAction' => null,
+                    ],
+                ],
+            ],
+        );
+
+        $response = $app->handle(FactoryHelper::createServerRequestCreator()->createFromGlobals());
+
+        self::assertSame(
+            500,
+            $response->getStatusCode(),
+            "Expected HTTP '500' for route 'site/trigger-exception'.",
+        );
+        self::assertSame(
+            'text/html; charset=UTF-8',
+            $response->getHeaderLine('Content-Type'),
+            "Expected Content-Type 'text/html; charset=UTF-8' for route 'site/trigger-exception'.",
+        );
+        self::assertSame(
+            '1',
+            ini_get('display_errors'),
+            "'display_errors' should be set to '1' in debug mode when rendering exception.",
+        );
+
+        $bufferAfterLevel = ob_get_level();
+
+        self::assertLessThanOrEqual(
+            $bufferBeforeLevel,
+            $bufferAfterLevel,
+            "'clearOutput()' should properly clean output buffers",
+        );
+
+        while (ob_get_level() < $bufferBeforeLevel) {
+            ob_start();
+        }
+
+        self::assertSame(
+            $bufferBeforeLevel,
+            ob_get_level(),
+            'Output buffers should be restored to initial level.',
+        );
+
+        ini_set('display_errors', $originalDisplayErrors);
+
+        @\runkit_constant_redefine('YII_ENV_TEST', true);
+    }
+
     /**
      * @throws InvalidConfigException if the configuration is invalid or incomplete.
      *
diff --git a/tests/http/stateless/ApplicationTest.php b/tests/http/stateless/ApplicationTest.php
index f4b367ce..f4923db8 100644
--- a/tests/http/stateless/ApplicationTest.php
+++ b/tests/http/stateless/ApplicationTest.php
@@ -4,16 +4,11 @@
 
 namespace yii2\extensions\psrbridge\tests\http\stateless;
 
-use PHPUnit\Framework\Attributes\{Group, RequiresPhpExtension};
+use PHPUnit\Framework\Attributes\{Group};
 use yii\base\InvalidConfigException;
 use yii2\extensions\psrbridge\tests\support\FactoryHelper;
 use yii2\extensions\psrbridge\tests\TestCase;
 
-use function ini_get;
-use function ini_set;
-use function ob_get_level;
-use function ob_start;
-
 #[Group('http')]
 final class ApplicationTest extends TestCase
 {
@@ -24,65 +19,6 @@ protected function tearDown(): void
         parent::tearDown();
     }
 
-    /**
-     * @throws InvalidConfigException if the configuration is invalid or incomplete.
-     */
-    #[RequiresPhpExtension('runkit7')]
-    public function testRenderExceptionSetsDisplayErrorsInDebugMode(): void
-    {
-        @\runkit_constant_redefine('YII_ENV_TEST', false);
-
-        $initialBufferLevel = ob_get_level();
-
-        $_SERVER = [
-            'REQUEST_METHOD' => 'GET',
-            'REQUEST_URI' => 'site/trigger-exception',
-        ];
-
-        $originalDisplayErrors = ini_get('display_errors');
-
-        try {
-            $app = $this->statelessApplication(
-                [
-                    'components' => [
-                        'errorHandler' => ['errorAction' => null],
-                    ],
-                ],
-            );
-
-            $response = $app->handle(FactoryHelper::createServerRequestCreator()->createFromGlobals());
-
-            self::assertSame(
-                500,
-                $response->getStatusCode(),
-                "Expected HTTP '500' for route 'site/trigger-exception'.",
-            );
-            self::assertSame(
-                'text/html; charset=UTF-8',
-                $response->getHeaderLine('Content-Type'),
-                "Expected Content-Type 'text/html; charset=UTF-8' for route 'site/trigger-exception'.",
-            );
-            self::assertSame(
-                '1',
-                ini_get('display_errors'),
-                "'display_errors' should be set to '1' when YII_DEBUG mode is enabled and rendering exception view.",
-            );
-            self::assertStringContainsString(
-                'yii\base\Exception: Exception error message.',
-                $response->getBody()->getContents(),
-                'Response should contain exception details when YII_DEBUG mode is enabled.',
-            );
-        } finally {
-            ini_set('display_errors', $originalDisplayErrors);
-
-            while (ob_get_level() < $initialBufferLevel) {
-                ob_start();
-            }
-
-            @\runkit_constant_redefine('YII_ENV_TEST', true);
-        }
-    }
-
     /**
      * @throws InvalidConfigException if the configuration is invalid or incomplete.
      */