code: function() {
      const dir = path.join(this.project.root, 'app');
      let prefix = this.parent.isEmberCLIAddon() ? 'dummy' : this.parent.name();
      return this._getIncludesForDir(dir, prefix);
    }
docs: Get paths to include for covering the "app" directory.
  @returns {Array<String>} include paths