public function testAppSecretProof()
 {
     FacebookSession::enableAppSecretProof(true);
     $request = new FacebookRequest(FacebookTestHelper::$testSession, 'GET', '/me');
     $this->assertTrue(isset($request->getParameters()['appsecret_proof']));
     FacebookSession::enableAppSecretProof(false);
     $request = new FacebookRequest(FacebookTestHelper::$testSession, 'GET', '/me');
     $this->assertTrue(!isset($request->getParameters()['appsecret_proof']));
 }