Function expect

test/parallel/test-cli-node-options.js:98–133

(
  opt, want, command = 'console.log("B")', wantsError = false, testWorker = true
)

}

function expect(
  opt, want, command = 'console.log("B")', wantsError = false, testWorker = true
) {
  const argv = [
    // --perf-basic-prof and --perf-basic-prof-only-functions write to /tmp by default.
    `--perf-basic-prof-path=${tmpdir.path}`,
    '-e',
    command,
  ];
  const opts = {
    cwd: tmpdir.path,
    env: Object.assign({}, process.env, { NODE_OPTIONS: opt }),
    maxBuffer: 1e6,
  };
  if (typeof want === 'string')
    want = new RegExp(want);

  const test = common.mustCallAtLeast((type) => common.mustCall((err, stdout) => {
    const o = JSON.stringify(opt);
    if (wantsError) {
      assert.ok(err, `${type}: expected error for ${o}`);
      stdout = err.stack;
    } else {
      assert.ifError(err, `${type}: failed for ${o}`);
    }
    if (want.test(stdout)) return;

    assert.fail(
      `${type}: for ${o}, failed to find ${want} in: <\n${stdout}\n>`
    );
  }));

  exec(process.execPath, argv, opts, test('child process'));
  if (testWorker)
    workerTest(opts, command, wantsError, test('worker'));
}

async function collectStream(readable) {
  readable.setEncoding('utf8');