mirror of https://github.com/tc39/test262.git
56 lines
1.5 KiB
JavaScript
56 lines
1.5 KiB
JavaScript
// Copyright (C) 2015 the V8 project authors. All rights reserved.
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// This code is governed by the BSD license found in the LICENSE file.
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/*---
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description: >
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Invocation of the instance's `then` method
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es6id: 25.4.4.3
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info: >
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11. Let result be PerformPromiseRace(iteratorRecord, C, promiseCapability).
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[...]
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25.4.4.3.1 Runtime Semantics: PerformPromiseRace
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1. Repeat
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[...]
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j. Let result be Invoke(nextPromise, "then",
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«promiseCapability.[[Resolve]], promiseCapability.[[Reject]]»).
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k. ReturnIfAbrupt(result).
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---*/
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var p1 = new Promise(function() {});
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var p2 = new Promise(function() {});
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var p3 = new Promise(function() {});
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var callCount = 0;
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var currentThis = p1;
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var nextThis = p2;
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var afterNextThis = p3;
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p1.then = p2.then = p3.then = function(a, b) {
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assert.sameValue(typeof a, 'function', 'type of first argument');
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assert.sameValue(
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a.length,
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1,
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'ES6 25.4.1.3.2: The length property of a promise resolve function is 1.'
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);
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assert.sameValue(typeof b, 'function', 'type of second argument');
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assert.sameValue(
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b.length,
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1,
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'ES6 25.4.1.3.1: The length property of a promise reject function is 1.'
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);
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assert.sameValue(arguments.length, 2, '`then` invoked with two arguments');
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assert.sameValue(this, currentThis, '`this` value');
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currentThis = nextThis;
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nextThis = afterNextThis;
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afterNextThis = null;
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callCount += 1;
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};
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Promise.race([p1, p2, p3]);
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assert.sameValue(callCount, 3, '`then` invoked once for every iterated value');
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