JSTests/test262/test/built-ins/Promise/race/resolve-from-same-thenable.js

// Copyright (C) 2020 Rick Waldron. All rights reserved.
// This code is governed by the BSD license found in the LICENSE file.

/*---
esid: sec-performpromiserace
description: >
  Promise.race does not prevent resolve from being called multiple times.
info: |
  PerformPromiseRace

  Repeat,
    Let next be IteratorStep(iteratorRecord).
    If next is an abrupt completion, set iteratorRecord.[[Done]] to true.
    ReturnIfAbrupt(next).
    If next is false, then
      Set iteratorRecord.[[Done]] to true.
      Return resultCapability.[[Promise]].
    Let nextValue be IteratorValue(next).
    If nextValue is an abrupt completion, set iteratorRecord.[[Done]] to true.
    ReturnIfAbrupt(nextValue).
    Let nextPromise be ? Call(promiseResolve, constructor, « nextValue »).
    Perform ? Invoke(nextPromise, "then", « resultCapability.[[Resolve]], resultCapability.[[Reject]] »).

includes: [promiseHelper.js]
---*/

let callCount = 0;
let sequence = [];

function Constructor(executor) {
  function resolve(value) {
    callCount += 1;
    sequence.push(value);
  }
  executor(resolve, Test262Error.thrower);
}
Constructor.resolve = function(v) {
  return v;
};

let pResolve;
let a = {
  then(resolver, rejector) {
    pResolve = resolver;
  }
};

assert.sameValue(callCount, 0, 'callCount before call to race()');

Promise.race.call(Constructor, [a]);

assert.sameValue(callCount, 0, 'callCount after call to race()');

pResolve(1);
pResolve(2);
pResolve(3);

assert.sameValue(callCount, 3, 'callCount after resolving a');
assert.sameValue(sequence.length, 3);
checkSequence(sequence);