function createMockRunner(runStr, ifStr1, ifStr2, ifStr3, arg1, arg2) {
  var runnerFunction = createRunnerFunction(
    runStr,
    ifStr1,
    ifStr2,
    ifStr3,
    arg1,
    arg2
  );
  var mockRunner = {
    on: runnerFunction,
    once: runnerFunction
  };
  createStatsCollector(mockRunner);
  return mockRunner;
}
Creates a mock runner object.

@param {string} runStr - argument that defines the runnerEvent
@param {string} ifStr1 - runner event
@param {(string|null)} [ifStr2] - runner event
@param {(string|null)} [ifStr3] - runner event
@param {(*|null)} [arg1] - variable to be added to event handler's scope
@param {(*|null)} [arg2] - variable to be added to event handler's scope
@return {Object} mock runner instance