code: function clean(test) {
    return {
      title: test.title,
      fullTitle: test.fullTitle(),
      duration: test.duration,
      currentRetry: test.currentRetry()
    };
  }
docs: Returns an object literal representation of `test`
  free of cyclic properties, etc.
  
  @private
  @param {Test} test - Instance used as data source.
  @return {Object} object containing pared-down test instance data