Merge pull request #8484 from chinpei215/fix-risky-test

Fix a risky test

tests/TestCase/Network/ResponseTest.php

@@ -1518,7 +1518,6 @@ class ResponseTest extends TestCase
      */
     public function testGetFile()
     {
-        ob_start();
         $response = new Response();
         $this->assertNull($response->getFile(), 'No file to get');