323 lines
9.1 KiB
JavaScript
323 lines
9.1 KiB
JavaScript
'use strict';
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var defineProperties = require('define-properties');
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var test = require('tape');
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var callBind = require('call-bind');
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var functionsHaveNames = require('functions-have-names')();
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var hasProto = require('has-proto')();
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var forEach = require('for-each');
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var debug = require('object-inspect');
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var v = require('es-value-fixtures');
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var hasSymbols = require('has-symbols/shams')();
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var hasPropertyDescriptors = require('has-property-descriptors')();
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var mockProperty = require('mock-property');
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var index = require('../Iterator.from');
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var impl = require('../Iterator.from/implementation');
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var isEnumerable = Object.prototype.propertyIsEnumerable;
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var testIterator = require('./helpers/testIterator');
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var $Iterator = require('../Iterator/implementation');
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var iterProto = require('iterator.prototype');
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var getCodePoints = function getCodePoints(str) {
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var chars = [];
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for (var i = 0; i < str.length; i++) {
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var c1 = str.charCodeAt(i);
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if (c1 >= 0xD800 && c1 < 0xDC00 && i + 1 < str.length) {
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var c2 = str.charCodeAt(i + 1);
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if (c2 >= 0xDC00 && c2 < 0xE000) {
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chars.push(str.charAt(i) + str.charAt(i + 1));
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i += 1;
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continue; // eslint-disable-line no-continue, no-restricted-syntax
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}
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}
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chars.push(str.charAt(i));
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}
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return chars;
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};
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module.exports = {
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tests: function (from, name, t) {
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t['throws'](
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function () { return new from(); }, // eslint-disable-line new-cap
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TypeError,
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'`' + name + '` itself is not a constructor'
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);
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t['throws'](
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function () { return new from({}); }, // eslint-disable-line new-cap
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TypeError,
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'`' + name + '` itself is not a constructor, with an argument'
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);
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forEach(v.primitives.concat(v.objects), function (nonIterator) {
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if (typeof nonIterator !== 'string') {
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t['throws'](
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function () { from(nonIterator).next(); },
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TypeError,
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debug(nonIterator) + ' is not an iterable Object'
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);
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}
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});
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t.test('actual iteration', { skip: !hasSymbols }, function (st) {
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forEach(v.nonFunctions, function (nonFunction) {
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var badIterable = {};
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badIterable[Symbol.iterator] = nonFunction;
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st['throws'](
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function () { from(badIterable).next(); },
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TypeError,
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debug(badIterable) + ' is not a function'
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);
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});
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// st['throws'](
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// function () { return new from([]); }, // eslint-disable-line new-cap
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// RangeError,
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// '`' + name + '` iterator is not a constructor'
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// );
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forEach(v.strings, function (string) {
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var stringIt = from(string);
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testIterator(stringIt, getCodePoints(string), st, 'string iterator: ' + debug(string));
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});
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var arrayIt = from([1, 2, 3]);
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st.equal(typeof arrayIt.next, 'function', 'has a `next` function');
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st.test('__proto__ is Iterator.prototype', { skip: !hasProto }, function (s2t) {
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var fakeIterator = {
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__proto__: iterProto,
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next: function () {}
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};
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s2t.ok(fakeIterator instanceof $Iterator, 'is an instanceof Iterator');
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s2t.equal(typeof fakeIterator.next, 'function', 'fake iterator `.next` is a function');
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s2t.equal(from(fakeIterator), fakeIterator, 'returns input when it is an instanceof Iterator');
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s2t.end();
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});
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st.test('real iterators', { skip: !hasSymbols }, function (s2t) {
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var iter = [][Symbol.iterator]();
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// eslint-disable-next-line no-proto
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var arrayIterHasIterProto = hasProto && iter.__proto__.__proto__ !== Object.prototype;
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s2t.equal(
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from(iter),
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iter,
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'array iterator becomes itself',
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{ skip: !arrayIterHasIterProto && 'node 0.12 - 3 do not have Iterator.prototype in the proto chains' }
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);
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s2t.end();
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});
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st.test('observability in a replaced String iterator', function (s2t) {
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var originalStringIterator = String.prototype[Symbol.iterator];
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var observedType;
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s2t.teardown(mockProperty(String.prototype, Symbol.iterator, {
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get: function () {
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'use strict'; // eslint-disable-line strict, lines-around-directive
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observedType = typeof this;
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return originalStringIterator;
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}
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}));
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from('');
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s2t.equal(observedType, 'string', 'string primitive -> primitive receiver in Symbol.iterator getter');
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from(Object(''));
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s2t.equal(observedType, 'object', 'boxed string -> boxed string in Symbol.iterator getter');
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s2t.end();
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});
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st.test('262: get-next-method-only-once', { skip: !hasPropertyDescriptors }, function (s2t) {
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var nextGets = 0;
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var testIter = {
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next: function () {
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return { done: true, value: undefined };
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}
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};
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Object.defineProperty(testIter, 'next', {
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get: function () {
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nextGets += 1;
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return function () {
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return { done: true, value: undefined };
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};
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}
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});
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var iter = from(testIter);
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s2t.equal(nextGets, 1, 'next retrieved once on creation');
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iter.next();
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s2t.equal(nextGets, 1, 'next not retrieved again on next()');
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iter.next();
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s2t.equal(nextGets, 1, 'next still not retrieved again');
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s2t.end();
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});
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st.test('262: get-next-method-throws', { skip: !hasPropertyDescriptors }, function (s2t) {
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var testIter = {};
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Object.defineProperty(testIter, 'next', {
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get: function () {
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throw new EvalError('next getter threw');
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}
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});
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s2t['throws'](
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function () { from(testIter); },
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EvalError,
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'throws when getting next throws'
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);
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s2t.end();
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});
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st.test('262: iterable-to-iterator-fallback', function (s2t) {
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// When Symbol.iterator is null/undefined, treat object as iterator
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var iteratorObj = {
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next: function () {
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return { done: true, value: undefined };
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}
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};
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iteratorObj[Symbol.iterator] = null;
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var iter1 = from(iteratorObj);
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s2t.equal(typeof iter1.next, 'function', 'iterator with null Symbol.iterator is treated as iterator');
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var iteratorObj2 = {
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next: function () {
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return { done: true, value: undefined };
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}
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};
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iteratorObj2[Symbol.iterator] = undefined;
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var iter2 = from(iteratorObj2);
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s2t.equal(typeof iter2.next, 'function', 'iterator with undefined Symbol.iterator is treated as iterator');
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s2t.end();
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});
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st.test('262: return-is-forwarded', function (s2t) {
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var returnCalls = 0;
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var testIter = {
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next: function () {
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return { done: false, value: 1 };
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},
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'return': function () {
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returnCalls += 1;
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return { done: true, value: undefined };
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}
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};
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var iter = from(testIter);
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iter.next();
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s2t.equal(returnCalls, 0, 'return not called before calling return()');
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iter['return']();
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s2t.equal(returnCalls, 1, 'return called once after return()');
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s2t.end();
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});
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st.test('262: return-method-returns-iterator-result', function (s2t) {
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// When base iterator has no return method, wrapper's return() returns { done: true, value: undefined }
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var testIter = {
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next: function () {
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return { done: false, value: 1 };
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}
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};
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var iter = from(testIter);
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iter.next();
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var result = iter['return']();
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s2t.equal(result.done, true, 'done is true');
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s2t.equal(result.value, undefined, 'value is undefined');
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s2t.end();
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});
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st.test('262: get-return-method-throws', { skip: !hasPropertyDescriptors }, function (s2t) {
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var testIter = {
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next: function () {
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return { done: false, value: 1 };
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}
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};
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Object.defineProperty(testIter, 'return', {
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get: function () {
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throw new SyntaxError('return getter threw');
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}
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});
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var iter = from(testIter);
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iter.next();
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s2t['throws'](
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function () { iter['return'](); },
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SyntaxError,
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'throws when getting return throws'
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);
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s2t.end();
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});
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st.test('262: supports-iterator', function (s2t) {
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// Non-iterable iterator objects (no Symbol.iterator, but has next)
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var plainIterator = {
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next: function () {
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return { done: true, value: 42 };
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}
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};
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var iter = from(plainIterator);
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s2t.equal(typeof iter.next, 'function', 'wrapped iterator has next method');
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var result = iter.next();
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s2t.equal(result.done, true, 'done is true');
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s2t.equal(result.value, 42, 'value is passed through');
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s2t.end();
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});
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st.test('262: supports-iterable', function (s2t) {
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// Iterable objects work
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var arr = [1, 2, 3];
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testIterator(from(arr), [1, 2, 3], s2t, 'array iterable');
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s2t.end();
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});
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st.end();
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});
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},
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index: function () {
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test('Iterator.from: index', function (t) {
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module.exports.tests(index, 'Iterator.from', t);
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t.end();
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});
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},
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implementation: function () {
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test('Iterator.from: implementation', function (t) {
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module.exports.tests(impl, 'Iterator.from', t);
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t.end();
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});
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},
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shimmed: function () {
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test('Iterator.from: shimmed', function (t) {
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t.test('Function name', { skip: !functionsHaveNames }, function (st) {
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st.equal(Iterator.from.name, 'from', 'Iterator.from has name "from"');
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st.end();
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});
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t.test('enumerability', { skip: !defineProperties.supportsDescriptors }, function (et) {
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et.equal(false, isEnumerable.call(Iterator, 'from'), 'Iterator.from is not enumerable');
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et.end();
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});
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module.exports.tests(callBind(Iterator.from, Iterator), 'Iterator.from', t);
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t.end();
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});
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}
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};
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