nodejs/test/parallel/test-microtask-queue-integration.js

// Copyright Joyent, Inc. and other Node contributors.
//
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// copy of this software and associated documentation files (the
// "Software"), to deal in the Software without restriction, including
// without limitation the rights to use, copy, modify, merge, publish,
// distribute, sublicense, and/or sell copies of the Software, and to permit
// persons to whom the Software is furnished to do so, subject to the
// following conditions:
//
// The above copyright notice and this permission notice shall be included
// in all copies or substantial portions of the Software.
//
// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS
// OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
// MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN
// NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM,
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// USE OR OTHER DEALINGS IN THE SOFTWARE.

'use strict';
require('../common');
const assert = require('assert');

const implementations = [
  function(fn) {
    Promise.resolve().then(fn);
  },
];

let expected = 0;
let done = 0;

process.on('exit', function() {
  assert.strictEqual(done, expected);
});

function test(scheduleMicrotask) {
  let nextTickCalled = false;
  expected++;

  scheduleMicrotask(function() {
    process.nextTick(function() {
      nextTickCalled = true;
    });

    setTimeout(function() {
      assert(nextTickCalled);
      done++;
    }, 0);
  });
}

// first tick case
implementations.forEach(test);

// tick callback case
setTimeout(function() {
  implementations.forEach(function(impl) {
    process.nextTick(test.bind(null, impl));
  });
}, 0);