Method __setupForTesting

tests/helpers/package-cache.js:242–245

* The `__setupForTesting` modifies things in module scope. * * @private * @method __setupForTesting

(stubs)

   * @method __setupForTesting
   */
  __setupForTesting(stubs) {
    originals = commands;
    commands = stubs.commands;
  }

  /**
   * The `__resetForTesting` puts things back in module scope.