deno/cli/tests/unit/dispatch_json_test.ts

import {
  assertStrictEquals,
  unitTest,
  assertMatch,
} from "./test_util.ts";

declare global {
  // eslint-disable-next-line @typescript-eslint/no-namespace
  namespace Deno {
    // eslint-disable-next-line @typescript-eslint/no-explicit-any
    var core: any; // eslint-disable-line no-var
  }
}

unitTest(function malformedJsonControlBuffer(): void {
  const opId = Deno.core.ops()["op_open_sync"];
  const argsBuf = new Uint8Array([1, 2, 3, 4, 5]);
  const resBuf = Deno.core.send(opId, argsBuf);
  const resText = new TextDecoder().decode(resBuf);
  const resObj = JSON.parse(resText);
  assertStrictEquals(resObj.ok, undefined);
  assertStrictEquals(resObj.err.className, "SyntaxError");
  assertMatch(resObj.err.message, /\bexpected value\b/);
});

unitTest(function invalidPromiseId(): void {
  const opId = Deno.core.ops()["op_open_async"];
  const argsObj = {
    promiseId: "1. NEIN!",
    path: "/tmp/P.I.S.C.I.X/yeah",
    mode: 0o666,
    options: {
      read: true,
      write: true,
      create: true,
      truncate: false,
      append: false,
      createNew: false,
    },
  };
  const argsText = JSON.stringify(argsObj);
  const argsBuf = new TextEncoder().encode(argsText);
  const resBuf = Deno.core.send(opId, argsBuf);
  const resText = new TextDecoder().decode(resBuf);
  const resObj = JSON.parse(resText);
  console.error(resText);
  assertStrictEquals(resObj.ok, undefined);
  assertStrictEquals(resObj.err.className, "TypeError");
  assertMatch(resObj.err.message, /\bpromiseId\b/);
});