Several method invocations in Zend_Gdata_YouTubeOnlineTest attempt to use named variables, even though this isn't supported by PHP. For example:

        $httpClient = Zend_Gdata_ClientLogin::getHttpClient(
                                          $username = $this->user,
                                          $password = $this->pass,
                                          $service = $service,
                                          $client = null,
                                          $source = 'Google-UnitTests-1.0',
                                          $loginToken = null,
                                          $loginCaptcha = null,
                                          $authenticationURL);

should be:

        $httpClient = Zend_Gdata_ClientLogin::getHttpClient(
                                          $this->user,
                                          $this->pass,
                                          $service,
                                          null,
                                          'Google-UnitTests-1.0',
                                          null,
                                          null,
                                          $authenticationURL);

It may be useful to add comments or use variables where the parameter being referred to isn't clear, but using the = operator is wasteful and should be removed.