promise-2.js - mozsearch

Enable keyboard shortcuts

function testOwnConstructorProp() {

  let p = Promise.resolve(0);

  let c = 0;

  Object.defineProperty(p, "constructor", {get() {

    c++;

    return Promise;

  }});

  p.then(() => {});

  p.then(() => {});

  assertEq(c, 2);

testOwnConstructorProp();

function testOtherProtoConstructorProp() {

  let p = Promise.resolve(0);

  let proto = Object.create(Promise.prototype);

  Object.setPrototypeOf(p, proto);

  let c = 0;

  Object.defineProperty(proto, "constructor", {get() {

    c++;

    return Promise;

  }});

  p.then(() => {});

  p.then(() => {});

  assertEq(c, 2);

testOtherProtoConstructorProp();

function testOwnThenProp() {

  let p = new Promise(function() {});

  let c = 0;

  Object.defineProperty(p, "then", {get() {

    c++;

    return Promise.prototype.then;

  }});

  p.catch();

  assertEq(c, 1);

testOwnThenProp();

function testOtherProtoThenProp() {

  let p = new Promise(function() {});

  let proto = Object.create(Promise.prototype);

  Object.setPrototypeOf(p, proto);

  let c = 0;

  Object.defineProperty(proto, "then", {get() {

    c++;

    return Promise.prototype.then;

  }});

  p.catch();

  assertEq(c, 1);

testOtherProtoThenProp();

// Fuse should still be intact after all that.

assertEq(getFuseState().OptimizePromiseLookupFuse.intact, true);

function testClobberResolve() {

  newGlobal().evaluate(`

    let origResolve = Promise.resolve;

    let c = 0;

    Promise.resolve = function() {

      c++;

      return origResolve.apply(this, arguments);

};

    let p1 = new Promise(function() {});

    let p2 = new Promise(function() {});

    Promise.all([p1, p2]);

    assertEq(c, 2);

`);

testClobberResolve();