code: function selectScenario(data, scenario) {
          return _execute('PUT', '/mocks', {
              identifier: _getIdentifier(data),
              scenario: scenario || null
          }, 'Could not select scenario [' + scenario + ']');
      }
docs: Selects the given scenario for the mock matching the identifier.
  
  @param {Object | String} data The data object containing all the information for an expression or the name of the mock.
  @param scenario The scenario that is selected to be returned when the api is called.
  @return {Promise} the promise.