minor #30132 [Form] add back test after fixing it (xabbuh)

This PR was merged into the 3.4 branch.

Discussion
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[Form] add back test after fixing it

| Q             | A
| ------------- | ---
| Branch?       | 3.4
| Bug fix?      | no
| New feature?  | no
| BC breaks?    | no
| Deprecations? | no
| Tests pass?   | yes
| Fixed tickets | https://github.com/symfony/symfony/pull/29934#discussion_r250501108
| License       | MIT
| Doc PR        |

Commits
-------

0daeba8e8a add back test after fixing it

src/Symfony/Component/Form/Tests/AbstractRequestHandlerTest.php

@@ -285,6 +285,26 @@ abstract class AbstractRequestHandlerTest extends TestCase
         $this->assertSame($file, $form->getData());
     }
 
+    /**
+     * @dataProvider methodExceptGetProvider
+     */
+    public function testSubmitFileWithNamelessForm($method)
+    {
+        $form = $this->createForm('', $method, true);
+        $fileForm = $this->createBuilder('document', false, ['allow_file_upload' => true])->getForm();
+        $form->add($fileForm);
+        $file = $this->getUploadedFile();
+        $this->setRequestData($method, [
+            'document' => null,
+        ], [
+            'document' => $file,
+        ]);
+        $this->requestHandler->handleRequest($form, $this->request);
+
+        $this->assertTrue($form->isSubmitted());
+        $this->assertSame($file, $fileForm->getData());
+    }
+
     /**
      * @dataProvider getPostMaxSizeFixtures
      */