src/third_party/v8/test/mjsunit/async-hooks/api-methods.js

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// Flags: --expose-async-hooks

// Check for invalid arguments handling
(function() {
  assertTrue(async_hooks.hasOwnProperty('createHook'),
    'Async hooks missing createHook method');

  assertThrows(() => async_hooks.createHook());
  assertThrows(() => async_hooks.createHook(123));
  assertThrows(() => async_hooks.createHook('str'));
})();

// Check for correct API methods
(function() {
  assertTrue(async_hooks.hasOwnProperty('executionAsyncId'),
    'Async hooks missing executionAsyncId method');
  assertTrue(async_hooks.hasOwnProperty('triggerAsyncId'),
    'Async hooks missing triggerAsyncId method');

  let ah = async_hooks.createHook({});
  assertTrue(ah.hasOwnProperty('enable'), 'Async hooks missing enable method');
  assertTrue(ah.hasOwnProperty('disable'),
    'Async hooks missing disable method');
})();

// Check for correct enabling/disabling of async hooks
(function() {
  let storedPromise;
  let ah = async_hooks.createHook({
    init(asyncId, type, triggerAsyncId, resource) {
      storedPromise = resource.promise || resource;
    }
  });
  ah.enable();

  let createdPromise = new Promise(function(resolve) {
    resolve(42);
  });
  assertSame(storedPromise, createdPromise,
    "Async hooks weren't enabled correctly");
  ah.disable();
  createdPromise = Promise.resolve(52);
  assertNotSame(storedPromise, createdPromise,
    "Async hooks weren't disabled correctly");
  ah.enable();
  createdPromise = Promise.resolve(62);
  assertSame(storedPromise, createdPromise,
    "Async hooks weren't enabled correctly");
})();