@lezer/javascript/test/test-javascript.js

lezer-based JavaScript grammar

import {parser} from "../dist/index.js"
import {fileTests} from "@lezer/generator/dist/test"

import * as fs from "fs"
import * as path from "path"
import {fileURLToPath} from "url"
let caseDir = path.dirname(fileURLToPath(import.meta.url))

for (let file of fs.readdirSync(caseDir)) {
  if (!/\.txt$/.test(file)) continue

  let name = /^[^\.]*/.exec(file)[0]
  describe(name, () => {
    for (let {name, run} of fileTests(fs.readFileSync(path.join(caseDir, file), "utf8"), file))
      it(name, () => run(parser))
  })
}