bug #27937 [HttpFoundation] reset callback on StreamedResponse when setNotModified() is called (rubencm)

This PR was merged into the 2.8 branch.

Discussion
----------

[HttpFoundation] reset callback on StreamedResponse when setNotModified() is called

| Q             | A
| ------------- | ---
| Branch?       | 2.8
| Bug fix?      | yes
| New feature?  | no
| BC breaks?    | no
| Deprecations? | no
| Tests pass?   | yes
| Fixed tickets | #27924
| License       | MIT
| Doc PR        | No

Commits
-------

51a49c7f78 [HttpFoundation] reset callback on StreamedResponse when setNotModified() is called

Author: fabpot

StreamedResponse.php

@@ -134,4 +134,16 @@ public function getContent()
     {
         return false;
     }
+
+    /**
+     * {@inheritdoc}
+     *
+     * @return $this
+     */
+    public function setNotModified()
+    {
+        $this->setCallback(function () {});
+
+        return parent::setNotModified();
+    }
 }

Tests/ResponseTest.php

@@ -126,7 +126,7 @@ public function testMustRevalidateWithProxyRevalidateCacheControlHeader()
 
     public function testSetNotModified()
     {
-        $response = new Response();
+        $response = new Response('foo');
         $modified = $response->setNotModified();
         $this->assertObjectHasAttribute('headers', $modified);
         $this->assertObjectHasAttribute('content', $modified);
@@ -135,6 +135,11 @@ public function testSetNotModified()
         $this->assertObjectHasAttribute('statusText', $modified);
         $this->assertObjectHasAttribute('charset', $modified);
         $this->assertEquals(304, $modified->getStatusCode());
+
+        ob_start();
+        $modified->sendContent();
+        $string = ob_get_clean();
+        $this->assertEmpty($string);
     }
 
     public function testIsSuccessful()

Tests/StreamedResponseTest.php

@@ -132,4 +132,22 @@ public function testReturnThis()
         $this->assertInstanceOf('Symfony\Component\HttpFoundation\StreamedResponse', $response->sendHeaders());
         $this->assertInstanceOf('Symfony\Component\HttpFoundation\StreamedResponse', $response->sendHeaders());
     }
+
+    public function testSetNotModified()
+    {
+        $response = new StreamedResponse(function () { echo 'foo'; });
+        $modified = $response->setNotModified();
+        $this->assertObjectHasAttribute('headers', $modified);
+        $this->assertObjectHasAttribute('content', $modified);
+        $this->assertObjectHasAttribute('version', $modified);
+        $this->assertObjectHasAttribute('statusCode', $modified);
+        $this->assertObjectHasAttribute('statusText', $modified);
+        $this->assertObjectHasAttribute('charset', $modified);
+        $this->assertEquals(304, $modified->getStatusCode());
+
+        ob_start();
+        $modified->sendContent();
+        $string = ob_get_clean();
+        $this->assertEmpty($string);
+    }
 }