code: function flush(options) {
    options = _.defaults(options || {}, {
      stdout: true,
      stderr: true
    });
  
    var flushed = {};
  
    if (options.stdout) {
      flushed.stdout = cachedData.stdout;
      cachedData.stdout = [];
    }
  
    if (options.stderr) {
      flushed.stderr = cachedData.stderr;
      cachedData.stderr = [];
    }
  
    return flushed;
  }
docs: Flush collected data.
  
  @param {object} [options] Options
  @param {boolean} [options.stdout=true] Mock stdout
  @param {boolean} [options.stderr=true] Mock stderr
  @returns {object} Object containing two array corresponding to outputs.