code: function() {
      return this._findInRepoAddons().reduce((acc, addon) => {
        let addonDir = path.join(this.project.root, 'lib', addon.name);
        let addonAppDir = path.join(addonDir, 'app');
        let addonAddonDir = path.join(addonDir, 'addon');
        const addonAddonTestSupportDir = path.join(addonDir, 'addon-test-support');
        return concat(
          acc,
          this._getIncludesForDir(addonAppDir, this.parent.name()),
          this._getIncludesForDir(addonAddonDir, addon.name),
          this._getIncludesForDir(addonAddonTestSupportDir, `${addon.name}/test-support`)
        );
      }, []);
    }
docs: Get paths to include for covering the in-repo-addon directories in "lib/*".
  @returns {Array<String>} include paths