Refactor `test/index.js` to use constants
Refactor `test/index.js` to use constants

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