/**
  * Creates and returns this test suite
  *
  * @return PHPUnit_Framework_TestSuite
  */
 public static function suite()
 {
     $suite = new PHPUnit_Framework_TestSuite('Zend Framework - Zend_Service_Amazon');
     $suite->addTestSuite('Zend_Service_Amazon_OfflineTest');
     if (defined('TESTS_ZEND_SERVICE_AMAZON_ONLINE_ENABLED') && constant('TESTS_ZEND_SERVICE_AMAZON_ONLINE_ENABLED') && defined('TESTS_ZEND_SERVICE_AMAZON_ONLINE_ACCESSKEYID')) {
         $suite->addTestSuite('Zend_Service_Amazon_OnlineTest');
     } else {
         $suite->addTestSuite('Zend_Service_Amazon_OnlineTest_Skip');
     }
     $suite->addTest(Zend_Service_Amazon_Authentication_AllTests::suite());
     $suite->addTest(Zend_Service_Amazon_Ec2_AllTests::suite());
     $suite->addTest(Zend_Service_Amazon_S3_AllTests::suite());
     $suite->addTest(Zend_Service_Amazon_SimpleDb_AllTests::suite());
     $suite->addTest(Zend_Service_Amazon_Sqs_AllTests::suite());
     return $suite;
 }