public function testAuthHeader()
 {
     $oauth = new OAuth2($this->container);
     $oauth->createService('A', 'B', 'C', 'D', 'E', array('f', 'g'));
     $oauth->setAccessToken('foobar', 'BeaRer');
     $this->assertEquals('Authorization: Bearer foobar', $oauth->getAuthorizationHeader());
     $oauth->setAccessToken('foobar', 'unknown');
     $this->assertEquals('', $oauth->getAuthorizationHeader());
 }