Adding unit test for HTTP DELETE and RequestHandlerComponent::requestedWith

lib/Cake/Test/Case/Controller/Component/RequestHandlerComponentTest.php

@@ -601,6 +601,9 @@ class RequestHandlerComponentTest extends CakeTestCase {
 		$result = $this->RequestHandler->requestedWith(array('rss', 'atom'));
 		$this->assertFalse($result);
 
+        $_SERVER['REQUEST_METHOD'] = 'DELETE';
+        $this->assertEquals('json', $this->RequestHandler->requestedWith());
+
 		$_SERVER['REQUEST_METHOD'] = 'POST';
 		unset($_SERVER['CONTENT_TYPE']);
 		$_SERVER['HTTP_CONTENT_TYPE'] = 'application/json';