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

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+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))
+  })
+}