code: function (engineName) {
      var engine = engineName;
  
      // If the engine is not a function, retrieve it from the modules
      if (typeof engine !== 'function') {
        engine = Skeleton.modules[engineName];
      }
  
      // If the engine is not a function, throw an error
      if (typeof engine !== 'function') {
        throw new Error('Test engine was not found: ' + engineName);
      }
  
      // Run and return the engine in the context of this with batches as the first parameter
      return engine.call(this, this.batches);
    }
docs: Run method for a test suite (currently only supporting Mocha)
  @param {Function|String} engineName If a function, Skeleton will process via it. Otherwise, Skeleton will retrieve the engine from its modules.
  @returns {Mixed} Returns result of engine