node/test/parallel/test-timers-immediate.js

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

let immediateB;
let immediateC;
let immediateD;

let mainFinished = false;

setImmediate(common.mustCall(function() {
  assert.strictEqual(mainFinished, true);
  clearImmediate(immediateB);
}));

immediateB = setImmediate(function() {
  common.fail('this immediate should not run');
});

setImmediate(function(x, y, z) {
  immediateC = [x, y, z];
}, 1, 2, 3);

setImmediate(function(x, y, z, a, b) {
  immediateD = [x, y, z, a, b];
}, 1, 2, 3, 4, 5);

process.on('exit', function() {
  assert.deepStrictEqual(immediateC, [1, 2, 3], 'immediateC args should match');
  assert.deepStrictEqual(immediateD, [1, 2, 3, 4, 5], '5 args should match');
});

mainFinished = true;