Add missing jsdoc comments to `test/index.js`
Add missing jsdoc comments to `test/index.js`

yukkurisinai/mdast,eush77/remark,yukkurisinai/mdast,ulrikaugustsson/mdast,ulrikaugustsson/mdast,tanzania82/remarks,chcokr/mdast,chcokr/mdast,wooorm/remark,eush77/remark