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es.promise.js
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es.promise.js
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import { DESCRIPTORS, GLOBAL, PROTO, STRICT } from '../helpers/constants';
import { createIterable } from '../helpers/helpers';
import { Promise, Symbol } from 'core-js-pure';
import getIteratorMethod from 'core-js-pure/features/get-iterator-method';
import { setPrototypeOf, create } from 'core-js-pure/features/object';
import bind from 'core-js-pure/features/function/bind';
QUnit.test('Promise', assert => {
assert.isFunction(Promise);
assert.throws(() => {
Promise();
}, 'throws w/o `new`');
new Promise(function (resolve, reject) {
assert.isFunction(resolve, 'resolver is function');
assert.isFunction(reject, 'rejector is function');
if (STRICT) assert.same(this, undefined, 'correct executor context');
});
});
if (DESCRIPTORS) QUnit.test('Promise operations order', assert => {
let resolve, resolve2;
assert.expect(1);
const EXPECTED_ORDER = 'DEHAFGBC';
const async = assert.async();
let result = '';
const promise1 = new Promise(r => {
resolve = r;
});
resolve({
then() {
result += 'A';
throw Error();
},
});
promise1.catch(() => {
result += 'B';
});
promise1.catch(() => {
result += 'C';
assert.same(result, EXPECTED_ORDER);
async();
});
const promise2 = new Promise(r => {
resolve2 = r;
});
resolve2(Object.defineProperty({}, 'then', {
get() {
result += 'D';
throw Error();
},
}));
result += 'E';
promise2.catch(() => {
result += 'F';
});
promise2.catch(() => {
result += 'G';
});
result += 'H';
setTimeout(() => {
if (!~result.indexOf('C')) {
assert.same(result, EXPECTED_ORDER);
async();
}
}, 1e3);
});
QUnit.test('Promise#then', assert => {
assert.isFunction(Promise.prototype.then);
assert.nonEnumerable(Promise.prototype, 'then');
let promise = new Promise(resolve => {
resolve(42);
});
let FakePromise1 = promise.constructor = function (executor) {
executor(() => { /* empty */ }, () => { /* empty */ });
};
const FakePromise2 = FakePromise1[Symbol.species] = function (executor) {
executor(() => { /* empty */ }, () => { /* empty */ });
};
assert.ok(promise.then(() => { /* empty */ }) instanceof FakePromise2, 'subclassing, @@species pattern');
promise = new Promise(resolve => {
resolve(42);
});
promise.constructor = FakePromise1 = function (executor) {
executor(() => { /* empty */ }, () => { /* empty */ });
};
assert.ok(promise.then(() => { /* empty */ }) instanceof Promise, 'subclassing, incorrect `this` pattern');
promise = new Promise(resolve => {
resolve(42);
});
promise.constructor = FakePromise1 = function (executor) {
executor(() => { /* empty */ }, () => { /* empty */ });
};
FakePromise1[Symbol.species] = function () { /* empty */ };
assert.throws(() => {
promise.then(() => { /* empty */ });
}, 'NewPromiseCapability validations, #1');
FakePromise1[Symbol.species] = function (executor) {
executor(null, () => { /* empty */ });
};
assert.throws(() => {
promise.then(() => { /* empty */ });
}, 'NewPromiseCapability validations, #2');
FakePromise1[Symbol.species] = function (executor) {
executor(() => { /* empty */ }, null);
};
assert.throws(() => {
promise.then(() => { /* empty */ });
}, 'NewPromiseCapability validations, #3');
});
QUnit.test('Promise#catch', assert => {
assert.isFunction(Promise.prototype.catch);
assert.nonEnumerable(Promise.prototype, 'catch');
let promise = new Promise(resolve => {
resolve(42);
});
let FakePromise1 = promise.constructor = function (executor) {
executor(() => { /* empty */ }, () => { /* empty */ });
};
const FakePromise2 = FakePromise1[Symbol.species] = function (executor) {
executor(() => { /* empty */ }, () => { /* empty */ });
};
assert.ok(promise.catch(() => { /* empty */ }) instanceof FakePromise2, 'subclassing, @@species pattern');
promise = new Promise(resolve => {
resolve(42);
});
promise.constructor = FakePromise1 = function (executor) {
executor(() => { /* empty */ }, () => { /* empty */ });
};
assert.ok(promise.catch(() => { /* empty */ }) instanceof Promise, 'subclassing, incorrect `this` pattern');
promise = new Promise(resolve => {
resolve(42);
});
promise.constructor = FakePromise1 = function (executor) {
executor(() => { /* empty */ }, () => { /* empty */ });
};
FakePromise1[Symbol.species] = function () { /* empty */ };
assert.throws(() => {
promise.catch(() => { /* empty */ });
}, 'NewPromiseCapability validations, #1');
FakePromise1[Symbol.species] = function (executor) {
executor(null, () => { /* empty */ });
};
assert.throws(() => {
promise.catch(() => { /* empty */ });
}, 'NewPromiseCapability validations, #2');
FakePromise1[Symbol.species] = function (executor) {
executor(() => { /* empty */ }, null);
};
assert.throws(() => {
promise.catch(() => { /* empty */ });
}, 'NewPromiseCapability validations, #3');
assert.same(Promise.prototype.catch.call({
then(x, y) {
return y;
},
}, 42), 42, 'calling `.then`');
});
QUnit.test('Promise#@@toStringTag', assert => {
assert.ok(Promise.prototype[Symbol.toStringTag] === 'Promise', 'Promise::@@toStringTag is `Promise`');
assert.strictEqual(String(new Promise(() => { /* empty */ })), '[object Promise]', 'correct stringification');
});
QUnit.test('Promise.all', assert => {
const { all, resolve } = Promise;
assert.isFunction(all);
assert.arity(all, 1);
const iterable = createIterable([1, 2, 3]);
Promise.all(iterable).catch(() => { /* empty */ });
assert.ok(iterable.received, 'works with iterables: iterator received');
assert.ok(iterable.called, 'works with iterables: next called');
const array = [];
let done = false;
array['@@iterator'] = undefined;
array[Symbol.iterator] = function () {
done = true;
return getIteratorMethod([]).call(this);
};
Promise.all(array);
assert.ok(done);
assert.throws(() => {
all.call(null, []).catch(() => { /* empty */ });
}, TypeError, 'throws without context');
done = false;
try {
Promise.resolve = function () {
throw new Error();
};
Promise.all(createIterable([1, 2, 3], {
return() {
done = true;
},
})).catch(() => { /* empty */ });
} catch (error) { /* empty */ }
Promise.resolve = resolve;
assert.ok(done, 'iteration closing');
let FakePromise1 = function (executor) {
executor(() => { /* empty */ }, () => { /* empty */ });
};
let FakePromise2 = FakePromise1[Symbol.species] = function (executor) {
executor(() => { /* empty */ }, () => { /* empty */ });
};
FakePromise1.resolve = FakePromise2.resolve = bind(Promise.resolve, Promise);
assert.ok(all.call(FakePromise1, [1, 2, 3]) instanceof FakePromise1, 'subclassing, `this` pattern');
FakePromise1 = function () { /* empty */ };
FakePromise2 = function (executor) {
executor(null, () => { /* empty */ });
};
const FakePromise3 = function (executor) {
executor(() => { /* empty */ }, null);
};
FakePromise1.resolve = FakePromise2.resolve = FakePromise3.resolve = bind(Promise.resolve, Promise);
assert.throws(() => {
all.call(FakePromise1, [1, 2, 3]);
}, 'NewPromiseCapability validations, #1');
assert.throws(() => {
all.call(FakePromise2, [1, 2, 3]);
}, 'NewPromiseCapability validations, #2');
assert.throws(() => {
all.call(FakePromise3, [1, 2, 3]);
}, 'NewPromiseCapability validations, #3');
});
QUnit.test('Promise.race', assert => {
const { race, resolve } = Promise;
assert.isFunction(race);
assert.arity(race, 1);
const iterable = createIterable([1, 2, 3]);
Promise.race(iterable).catch(() => { /* empty */ });
assert.ok(iterable.received, 'works with iterables: iterator received');
assert.ok(iterable.called, 'works with iterables: next called');
const array = [];
let done = false;
array['@@iterator'] = undefined;
array[Symbol.iterator] = function () {
done = true;
return getIteratorMethod([]).call(this);
};
Promise.race(array);
assert.ok(done);
assert.throws(() => {
race.call(null, []).catch(() => { /* empty */ });
}, TypeError, 'throws without context');
done = false;
try {
Promise.resolve = function () {
throw new Error();
};
Promise.race(createIterable([1, 2, 3], {
return() {
done = true;
},
})).catch(() => { /* empty */ });
} catch (error) { /* empty */ }
Promise.resolve = resolve;
assert.ok(done, 'iteration closing');
let FakePromise1 = function (executor) {
executor(() => { /* empty */ }, () => { /* empty */ });
};
let FakePromise2 = FakePromise1[Symbol.species] = function (executor) {
executor(() => { /* empty */ }, () => { /* empty */ });
};
FakePromise1.resolve = FakePromise2.resolve = bind(Promise.resolve, Promise);
assert.ok(race.call(FakePromise1, [1, 2, 3]) instanceof FakePromise1, 'subclassing, `this` pattern');
FakePromise1 = function () { /* empty */ };
FakePromise2 = function (executor) {
executor(null, () => { /* empty */ });
};
const FakePromise3 = function (executor) {
executor(() => { /* empty */ }, null);
};
FakePromise1.resolve = FakePromise2.resolve = FakePromise3.resolve = bind(Promise.resolve, Promise);
assert.throws(() => {
race.call(FakePromise1, [1, 2, 3]);
}, 'NewPromiseCapability validations, #1');
assert.throws(() => {
race.call(FakePromise2, [1, 2, 3]);
}, 'NewPromiseCapability validations, #2');
assert.throws(() => {
race.call(FakePromise3, [1, 2, 3]);
}, 'NewPromiseCapability validations, #3');
});
QUnit.test('Promise.resolve', assert => {
const { resolve } = Promise;
assert.isFunction(resolve);
assert.throws(() => {
resolve.call(null, 1).catch(() => { /* empty */ });
}, TypeError, 'throws without context');
function FakePromise1(executor) {
executor(() => { /* empty */ }, () => { /* empty */ });
}
FakePromise1[Symbol.species] = function (executor) {
executor(() => { /* empty */ }, () => { /* empty */ });
};
assert.ok(resolve.call(FakePromise1, 42) instanceof FakePromise1, 'subclassing, `this` pattern');
assert.throws(() => {
resolve.call(() => { /* empty */ }, 42);
}, 'NewPromiseCapability validations, #1');
assert.throws(() => {
resolve.call(executor => {
executor(null, () => { /* empty */ });
}, 42);
}, 'NewPromiseCapability validations, #2');
assert.throws(() => {
resolve.call(executor => {
executor(() => { /* empty */ }, null);
}, 42);
}, 'NewPromiseCapability validations, #3');
});
QUnit.test('Promise.reject', assert => {
const { reject } = Promise;
assert.isFunction(reject);
assert.throws(() => {
reject.call(null, 1).catch(() => { /* empty */ });
}, TypeError, 'throws without context');
function FakePromise1(executor) {
executor(() => { /* empty */ }, () => { /* empty */ });
}
FakePromise1[Symbol.species] = function (executor) {
executor(() => { /* empty */ }, () => { /* empty */ });
};
assert.ok(reject.call(FakePromise1, 42) instanceof FakePromise1, 'subclassing, `this` pattern');
assert.throws(() => {
reject.call(() => { /* empty */ }, 42);
}, 'NewPromiseCapability validations, #1');
assert.throws(() => {
reject.call(executor => {
executor(null, () => { /* empty */ });
}, 42);
}, 'NewPromiseCapability validations, #2');
assert.throws(() => {
reject.call(executor => {
executor(() => { /* empty */ }, null);
}, 42);
}, 'NewPromiseCapability validations, #3');
});
if (PROTO) QUnit.test('Promise subclassing', assert => {
function SubPromise(executor) {
const self = new Promise(executor);
setPrototypeOf(self, SubPromise.prototype);
self.mine = 'subclass';
return self;
}
setPrototypeOf(SubPromise, Promise);
SubPromise.prototype = create(Promise.prototype);
SubPromise.prototype.constructor = SubPromise;
let promise1 = SubPromise.resolve(5);
assert.strictEqual(promise1.mine, 'subclass');
promise1 = promise1.then(it => {
assert.strictEqual(it, 5);
});
assert.strictEqual(promise1.mine, 'subclass');
let promise2 = new SubPromise(resolve => {
resolve(6);
});
assert.strictEqual(promise2.mine, 'subclass');
promise2 = promise2.then(it => {
assert.strictEqual(it, 6);
});
assert.strictEqual(promise2.mine, 'subclass');
const promise3 = SubPromise.all([promise1, promise2]);
assert.strictEqual(promise3.mine, 'subclass');
assert.ok(promise3 instanceof Promise);
assert.ok(promise3 instanceof SubPromise);
promise3.then(assert.async(), it => {
assert.ok(it, false);
});
});
// qunit@2.5 strange bug
QUnit.skip('Unhandled rejection tracking', assert => {
let done = false;
const resume = assert.async();
if (GLOBAL.process) {
assert.expect(3);
function onunhandledrejection(reason, promise) {
process.removeListener('unhandledRejection', onunhandledrejection);
assert.same(promise, $promise, 'unhandledRejection, promise');
assert.same(reason, 42, 'unhandledRejection, reason');
$promise.catch(() => {
// empty
});
}
function onrejectionhandled(promise) {
process.removeListener('rejectionHandled', onrejectionhandled);
assert.same(promise, $promise, 'rejectionHandled, promise');
done || resume();
done = true;
}
process.on('unhandledRejection', onunhandledrejection);
process.on('rejectionHandled', onrejectionhandled);
} else {
if (GLOBAL.addEventListener) {
assert.expect(8);
function onunhandledrejection(it) {
assert.same(it.promise, $promise, 'addEventListener(unhandledrejection), promise');
assert.same(it.reason, 42, 'addEventListener(unhandledrejection), reason');
GLOBAL.removeEventListener('unhandledrejection', onunhandledrejection);
}
GLOBAL.addEventListener('rejectionhandled', onunhandledrejection);
function onrejectionhandled(it) {
assert.same(it.promise, $promise, 'addEventListener(rejectionhandled), promise');
assert.same(it.reason, 42, 'addEventListener(rejectionhandled), reason');
GLOBAL.removeEventListener('rejectionhandled', onrejectionhandled);
}
GLOBAL.addEventListener('rejectionhandled', onrejectionhandled);
} else assert.expect(4);
GLOBAL.onunhandledrejection = function (it) {
assert.same(it.promise, $promise, 'onunhandledrejection, promise');
assert.same(it.reason, 42, 'onunhandledrejection, reason');
setTimeout(() => {
$promise.catch(() => {
// empty
});
}, 1);
GLOBAL.onunhandledrejection = null;
};
GLOBAL.onrejectionhandled = function (it) {
assert.same(it.promise, $promise, 'onrejectionhandled, promise');
assert.same(it.reason, 42, 'onrejectionhandled, reason');
GLOBAL.onrejectionhandled = null;
done || resume();
done = true;
};
}
Promise.reject(43).catch(() => {
// empty
});
const $promise = Promise.reject(42);
setTimeout(() => {
done || resume();
done = true;
}, 3e3);
});