text:  function runTest( config, qualifier )
   {
      function checkInitDataType(initDataType)
      {
          return isInitDataTypeSupported(initDataType).then(function(result) {
              // If |initDataType| is not supported, simply succeed.
              if (!result)
                  return Promise.resolve('Not supported');
  
              return navigator.requestMediaKeySystemAccess( config.keysystem, getSimpleConfigurationForInitDataType(initDataType))
                  .then(function(access) {
                      return access.createMediaKeys();
                  }).then(function(mediaKeys) {
                      var mediaKeySession = mediaKeys.createSession();
                      var initData = getInitData(initDataType);
                      return mediaKeySession.generateRequest(initDataType, initData);
                  });
          });
      }
  
      promise_test(function()
      {
          return checkInitDataType('webm');
      }, testnamePrefix( qualifier, config.keysystem )  + ' support for "webm".');
  
      promise_test(function()
      {
          return checkInitDataType('cenc');
      }, testnamePrefix( qualifier, config.keysystem ) + ' support for "cenc".');
  
      promise_test(function()
      {
          return checkInitDataType('keyids');
      }, testnamePrefix( qualifier, config.keysystem ) + ' support for "keyids".');
  }
  