rsxjs/__tests__/integration/mutex/test-fail-fast.js

Resilience Extensions for JS.

/**
 * @file tests/mutex/test-fail-fast.js
 * @copyright 2018-present Karim Alibhai. All rights reserved.
 */

import { test } from "../../helpers";

import { Mutex } from "../../../";

test("Mutex#failFast", async (t) => {
  const fn = Mutex.fromAsync(
    () =>
      new Promise(() => {
        // hang
      }),
    {
      failFast: true,
    }
  );

  // this will cause a locked state, and since
  // the method will not end, lock will not be released
  fn();

  // should fail instead of waiting
  await t.throwsAsync(fn());
});