b16fc86389
ES2015 Object.prototype.toString semantics were enabled in version 4.9, which has been in stable Chrome for nearly two weeks at this point. R=littledan@chromium.org Review URL: https://codereview.chromium.org/1784033002 Cr-Commit-Position: refs/heads/master@{#34732}
95 lines
3.1 KiB
JavaScript
95 lines
3.1 KiB
JavaScript
// Copyright 2014 the V8 project authors. All rights reserved.
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// Use of this source code is governed by a BSD-style license that can be
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// found in the LICENSE file.
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function TestStringPrototypeIterator() {
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assertTrue(String.prototype.hasOwnProperty(Symbol.iterator));
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assertFalse("".hasOwnProperty(Symbol.iterator));
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assertFalse("".propertyIsEnumerable(Symbol.iterator));
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}
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TestStringPrototypeIterator();
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function assertIteratorResult(value, done, result) {
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assertEquals({value: value, done: done}, result);
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}
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function TestManualIteration() {
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var string = "abc";
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var iterator = string[Symbol.iterator]();
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assertIteratorResult('a', false, iterator.next());
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assertIteratorResult('b', false, iterator.next());
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assertIteratorResult('c', false, iterator.next());
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assertIteratorResult(void 0, true, iterator.next());
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assertIteratorResult(void 0, true, iterator.next());
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}
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TestManualIteration();
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function TestSurrogatePairs() {
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var lo = "\uD834";
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var hi = "\uDF06";
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var pair = lo + hi;
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var string = "abc" + pair + "def" + lo + pair + hi + lo;
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var iterator = string[Symbol.iterator]();
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assertIteratorResult('a', false, iterator.next());
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assertIteratorResult('b', false, iterator.next());
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assertIteratorResult('c', false, iterator.next());
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assertIteratorResult(pair, false, iterator.next());
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assertIteratorResult('d', false, iterator.next());
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assertIteratorResult('e', false, iterator.next());
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assertIteratorResult('f', false, iterator.next());
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assertIteratorResult(lo, false, iterator.next());
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assertIteratorResult(pair, false, iterator.next());
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assertIteratorResult(hi, false, iterator.next());
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assertIteratorResult(lo, false, iterator.next());
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assertIteratorResult(void 0, true, iterator.next());
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assertIteratorResult(void 0, true, iterator.next());
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}
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TestSurrogatePairs();
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function TestStringIteratorPrototype() {
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var iterator = ""[Symbol.iterator]();
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var StringIteratorPrototype = iterator.__proto__;
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assertFalse(StringIteratorPrototype.hasOwnProperty('constructor'));
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assertEquals(StringIteratorPrototype.__proto__, Object.prototype);
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assertArrayEquals(['next'],
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Object.getOwnPropertyNames(StringIteratorPrototype));
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assertEquals('[object String Iterator]', "" + iterator);
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assertEquals("String Iterator", StringIteratorPrototype[Symbol.toStringTag]);
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var desc = Object.getOwnPropertyDescriptor(
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StringIteratorPrototype, Symbol.toStringTag);
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assertTrue(desc.configurable);
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assertFalse(desc.writable);
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assertEquals("String Iterator", desc.value);
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}
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TestStringIteratorPrototype();
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function TestForOf() {
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var lo = "\uD834";
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var hi = "\uDF06";
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var pair = lo + hi;
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var string = "abc" + pair + "def" + lo + pair + hi + lo;
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var expected = ['a', 'b', 'c', pair, 'd', 'e', 'f', lo, pair, hi, lo];
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var i = 0;
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for (var char of string) {
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assertEquals(expected[i++], char);
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}
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assertEquals(expected.length, i);
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}
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TestForOf();
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function TestNonOwnSlots() {
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var iterator = ""[Symbol.iterator]();
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var object = {__proto__: iterator};
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assertThrows(function() { object.next(); }, TypeError);
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}
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TestNonOwnSlots();
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