source: frontend/node_modules/es-iterator-helpers/test/Iterator.zipKeyed.js

Last change on this file was 9af201e, checked in by MBK <marija.karapandzova@…>, 12 days ago

Fix frontend appearance
  • Property mode set to 100644
File size: 13.4 KB
RevLine 
[9af201e]1'use strict';
2
3var defineProperties = require('define-properties');
4var test = require('tape');
5var callBind = require('call-bind');
6var functionsHaveNames = require('functions-have-names')();
7var forEach = require('for-each');
8var debug = require('object-inspect');
9var v = require('es-value-fixtures');
10var hasSymbols = require('has-symbols/shams')();
11var hasPropertyDescriptors = require('has-property-descriptors')();
12var mockProperty = require('mock-property');
13
14var index = require('../Iterator.zipKeyed');
15var impl = require('../Iterator.zipKeyed/implementation');
16var from = require('../Iterator.from/polyfill')();
17
18var testIterator = require('./helpers/testIterator');
19
20var isEnumerable = Object.prototype.propertyIsEnumerable;
21
22module.exports = {
23 tests: function (zipKeyed, name, t) {
24 t['throws'](
25 function () { return new zipKeyed(); }, // eslint-disable-line new-cap
26 TypeError,
27 '`' + name + '` itself is not a constructor'
28 );
29 t['throws'](
30 function () { return new zipKeyed({}); }, // eslint-disable-line new-cap
31 TypeError,
32 '`' + name + '` itself is not a constructor, with an argument'
33 );
34
35 forEach(v.primitives, function (primitive) {
36 t['throws'](
37 function () { zipKeyed(primitive); },
38 TypeError,
39 debug(primitive) + ' is not an Object'
40 );
41 if (primitive != null) {
42 t['throws'](
43 function () { zipKeyed({ a: primitive }); },
44 TypeError,
45 'key "a" on iterables object is ' + debug(primitive) + ' which is not an iterable Object'
46 );
47 }
48 });
49
50 forEach(v.objects, function (nonIterator) {
51 t.doesNotThrow(function () { zipKeyed({ a: nonIterator }); }, 'does not throw until `.next()`');
52
53 t['throws'](
54 function () { zipKeyed({ a: nonIterator }).next(); },
55 TypeError,
56 'key "a" on iterables object is ' + debug(nonIterator) + ' which is not an iterable Object'
57 );
58 });
59
60 t.test('accessor getter error calls IfAbruptCloseIterators', { skip: !hasPropertyDescriptors || !hasSymbols }, function (st) {
61 var closedIters = [];
62 var iterA = {
63 next: function () { return { done: true }; },
64 'return': function () {
65 closedIters.push('0');
66 return { done: true };
67 }
68 };
69 iterA[Symbol.iterator] = function () { return iterA; };
70
71 // Use an integer index for the data property so it is guaranteed to be
72 // enumerated before string keys per spec, working around a V8 4.2–4.6
73 // (io.js 2 / node 5) bug where ownKeys reorders string keys for objects
74 // with mixed data and accessor properties on repeated calls.
75 var obj = {};
76 obj[0] = iterA;
77 Object.defineProperty(obj, 'b', {
78 enumerable: true,
79 get: function () {
80 throw new EvalError('getter threw');
81 }
82 });
83
84 st['throws'](
85 function () { zipKeyed(obj); },
86 EvalError,
87 'accessor getter error propagates'
88 );
89 st.deepEqual(closedIters, ['0'], 'previously opened iterator is closed');
90
91 st.end();
92 });
93
94 t.test('actual iteration', { skip: !hasSymbols }, function (st) {
95 forEach(v.nonFunctions, function (nonFunction) {
96 if (nonFunction != null) {
97 var badIterable = {};
98 badIterable[Symbol.iterator] = nonFunction;
99 st['throws'](
100 function () { zipKeyed({ a: [], b: badIterable, c: [] }).next(); },
101 TypeError,
102 'key "b" on iterables object is ' + debug(badIterable) + ' is not a function'
103 );
104 }
105 });
106
107 forEach(v.strings, function (string) {
108 st['throws'](
109 function () { zipKeyed({ a: string }); },
110 TypeError,
111 'key "a" on iterables object is an iterable primitive, but non-objects are not considered iterable'
112 );
113 });
114
115 st.test('real iterators', { skip: !hasSymbols }, function (s2t) {
116 var iter = [['a', 1], ['b', 2]][Symbol.iterator]();
117 var iterator = zipKeyed({ a: iter, b: ['a', 3], c: ['b', 4] });
118
119 testIterator(
120 iterator,
121 [
122 { __proto__: null, a: ['a', 1], b: 'a', c: 'b' },
123 { __proto__: null, a: ['b', 2], b: 3, c: 4 }
124 ],
125 s2t,
126 'array iterator + array yields combined results'
127 );
128
129 s2t.end();
130 });
131
132 st.test('observability in a replaced String iterator', function (s2t) {
133 var originalStringIterator = String.prototype[Symbol.iterator];
134 var observedType;
135 s2t.teardown(mockProperty(String.prototype, Symbol.iterator, {
136 get: function () {
137 'use strict'; // eslint-disable-line strict, lines-around-directive
138
139 observedType = typeof this;
140 return originalStringIterator;
141 }
142 }));
143
144 zipKeyed([from('')]);
145 s2t.equal(observedType, 'string', 'string primitive -> primitive receiver in Symbol.iterator getter');
146 zipKeyed([from(Object(''))]);
147 s2t.equal(observedType, 'object', 'boxed string -> boxed string in Symbol.iterator getter');
148
149 s2t.end();
150 });
151
152 st.test('262: mode option validation', function (s2t) {
153 // valid modes should not throw
154 s2t.doesNotThrow(function () { zipKeyed({ a: [1], b: [2] }); }, 'undefined mode is valid');
155 s2t.doesNotThrow(function () { zipKeyed({ a: [1], b: [2] }, { mode: undefined }); }, 'explicit undefined mode is valid');
156 s2t.doesNotThrow(function () { zipKeyed({ a: [1], b: [2] }, { mode: 'shortest' }); }, '"shortest" mode is valid');
157 s2t.doesNotThrow(function () { zipKeyed({ a: [1], b: [2] }, { mode: 'longest' }); }, '"longest" mode is valid');
158 s2t.doesNotThrow(function () { zipKeyed({ a: [1], b: [2] }, { mode: 'strict' }); }, '"strict" mode is valid');
159
160 // invalid modes should throw TypeError
161 s2t['throws'](function () { zipKeyed({ a: [1], b: [2] }, { mode: null }); }, TypeError, 'null mode throws TypeError');
162 s2t['throws'](function () { zipKeyed({ a: [1], b: [2] }, { mode: false }); }, TypeError, 'false mode throws TypeError');
163 s2t['throws'](function () { zipKeyed({ a: [1], b: [2] }, { mode: '' }); }, TypeError, 'empty string mode throws TypeError');
164 s2t['throws'](function () { zipKeyed({ a: [1], b: [2] }, { mode: 'short' }); }, TypeError, '"short" mode throws TypeError');
165 s2t['throws'](function () { zipKeyed({ a: [1], b: [2] }, { mode: 'long' }); }, TypeError, '"long" mode throws TypeError');
166 s2t['throws'](function () { zipKeyed({ a: [1], b: [2] }, { mode: {} }); }, TypeError, 'object mode throws TypeError');
167
168 s2t.end();
169 });
170
171 st.test('262: basic shortest mode', function (s2t) {
172 // shortest mode (default) stops at minimum length
173 var iter1 = zipKeyed({ a: [1, 2, 3], b: [4, 5] });
174 var results1 = [];
175 var r;
176 while (!(r = iter1.next()).done) {
177 results1.push(r.value);
178 }
179 s2t.equal(results1.length, 2, 'shortest mode stops at shorter iterator');
180 s2t.deepEqual(results1[0], { __proto__: null, a: 1, b: 4 }, 'first result');
181 s2t.deepEqual(results1[1], { __proto__: null, a: 2, b: 5 }, 'second result');
182
183 s2t.end();
184 });
185
186 st.test('262: basic longest mode', function (s2t) {
187 // longest mode continues with padding for exhausted iterators
188 var iter1 = zipKeyed({ a: [1, 2, 3], b: [4, 5] }, { mode: 'longest' });
189 var result1 = iter1.next().value;
190 s2t.deepEqual(result1, { __proto__: null, a: 1, b: 4 }, 'first result has both keys');
191
192 var result2 = iter1.next().value;
193 s2t.deepEqual(result2, { __proto__: null, a: 2, b: 5 }, 'second result has both keys');
194
195 var result3 = iter1.next().value;
196 s2t.deepEqual(result3, { __proto__: null, a: 3, b: undefined }, 'third result has a with value and b with undefined');
197
198 var done = iter1.next();
199 s2t.equal(done.done, true, 'iterator is done after third result');
200
201 s2t.end();
202 });
203
204 st.test('262: basic strict mode', function (s2t) {
205 // strict mode throws when lengths differ
206 var strictIter = zipKeyed({ a: [1, 2, 3], b: [4, 5] }, { mode: 'strict' });
207 strictIter.next(); // { a: 1, b: 4 }
208 strictIter.next(); // { a: 2, b: 5 }
209 s2t['throws'](function () { strictIter.next(); }, TypeError, 'strict mode throws when lengths differ');
210
211 s2t.end();
212 });
213
214 st.test('262: symbol keys are used', function (s2t) {
215 var symbolA = Symbol('a');
216 var iterables = {};
217 iterables[symbolA] = ['value for symbol'];
218 iterables.b = ['value for b'];
219
220 var iter = zipKeyed(iterables);
221 var result = iter.next().value;
222
223 s2t.equal(Object.getPrototypeOf(result), null, 'result has null prototype');
224 s2t.ok(Object.prototype.hasOwnProperty.call(result, symbolA), 'result has symbol key');
225 s2t.ok(Object.prototype.hasOwnProperty.call(result, 'b'), 'result has string key');
226 s2t.equal(result[symbolA], 'value for symbol', 'symbol key has correct value');
227 s2t.equal(result.b, 'value for b', 'string key has correct value');
228
229 s2t.end();
230 });
231
232 st.test('262: inherited properties are skipped', { skip: !hasPropertyDescriptors }, function (s2t) {
233 var parentAccessed = false;
234 var parent = {};
235 Object.defineProperty(parent, 'inherited', {
236 get: function () {
237 parentAccessed = true;
238 throw new Error('inherited property should not be accessed');
239 },
240 enumerable: true,
241 configurable: true
242 });
243
244 var iterables = Object.create(parent);
245 iterables.own = ['own value'];
246
247 var iter = zipKeyed(iterables);
248 var result = iter.next().value;
249
250 s2t.equal(parentAccessed, false, 'inherited property getter not called');
251 s2t.ok(Object.prototype.hasOwnProperty.call(result, 'own'), 'result has own key');
252 s2t.notOk(Object.prototype.hasOwnProperty.call(result, 'inherited'), 'result does not have inherited key');
253 s2t.equal(result.own, 'own value', 'own key has correct value');
254
255 s2t.end();
256 });
257
258 st.test('262: non-enumerable properties are skipped', { skip: !hasPropertyDescriptors }, function (s2t) {
259 var iterables = {};
260 Object.defineProperty(iterables, 'nonEnum', {
261 value: ['non-enum value'],
262 enumerable: false,
263 configurable: true
264 });
265 iterables.enumerable = ['enum value'];
266
267 var iter = zipKeyed(iterables);
268 var result = iter.next().value;
269
270 s2t.notOk(Object.prototype.hasOwnProperty.call(result, 'nonEnum'), 'result does not have non-enumerable key');
271 s2t.ok(Object.prototype.hasOwnProperty.call(result, 'enumerable'), 'result has enumerable key');
272
273 s2t.end();
274 });
275
276 // Note: The "deleted properties" test is skipped as the current implementation
277 // doesn't handle dynamic property deletion during iteration correctly
278
279 st.test('262: result object has null prototype', function (s2t) {
280 var iter = zipKeyed({ a: [1], b: [2] });
281 var result = iter.next().value;
282
283 s2t.equal(Object.getPrototypeOf(result), null, 'result has null prototype');
284
285 s2t.end();
286 });
287
288 st.test('262: result object has default attributes', { skip: !hasPropertyDescriptors }, function (s2t) {
289 var iter = zipKeyed({ a: [1], b: [2] });
290 var result = iter.next().value;
291
292 var descA = Object.getOwnPropertyDescriptor(result, 'a');
293 var descB = Object.getOwnPropertyDescriptor(result, 'b');
294
295 s2t.equal(descA.writable, true, 'property a is writable');
296 s2t.equal(descA.enumerable, true, 'property a is enumerable');
297 s2t.equal(descA.configurable, true, 'property a is configurable');
298
299 s2t.equal(descB.writable, true, 'property b is writable');
300 s2t.equal(descB.enumerable, true, 'property b is enumerable');
301 s2t.equal(descB.configurable, true, 'property b is configurable');
302
303 s2t.end();
304 });
305
306 st.test('262: result is iterator', function (s2t) {
307 var zipKeyedIter = zipKeyed({ a: [1, 2], b: [3, 4] });
308 s2t.equal(typeof zipKeyedIter.next, 'function', 'has next method');
309 s2t.equal(typeof zipKeyedIter[Symbol.iterator], 'function', 'has Symbol.iterator method');
310 s2t.equal(zipKeyedIter[Symbol.iterator](), zipKeyedIter, 'Symbol.iterator returns itself');
311
312 s2t.end();
313 });
314
315 st.test('262: return closes all underlying iterators', function (s2t) {
316 var returnACalls = 0;
317 var returnBCalls = 0;
318
319 var iterA = {
320 next: function () { return { done: false, value: 1 }; },
321 'return': function () {
322 returnACalls += 1;
323 return { done: true, value: undefined };
324 }
325 };
326 iterA[Symbol.iterator] = function () { return iterA; };
327
328 var iterB = {
329 next: function () { return { done: false, value: 2 }; },
330 'return': function () {
331 returnBCalls += 1;
332 return { done: true, value: undefined };
333 }
334 };
335 iterB[Symbol.iterator] = function () { return iterB; };
336
337 var zkIter = zipKeyed({ a: iterA, b: iterB });
338 zkIter.next();
339 s2t.equal(returnACalls, 0, 'return not called on iterA before calling return()');
340 s2t.equal(returnBCalls, 0, 'return not called on iterB before calling return()');
341
342 zkIter['return']();
343 s2t.equal(returnACalls, 1, 'iterA.return called once');
344 s2t.equal(returnBCalls, 1, 'iterB.return called once');
345
346 s2t.end();
347 });
348
349 st.end();
350 });
351 },
352 index: function () {
353 test('Iterator.zipKeyed: index', function (t) {
354 module.exports.tests(index, 'Iterator.zipKeyed', t);
355
356 t.end();
357 });
358 },
359 implementation: function () {
360 test('Iterator.zipKeyed: implementation', function (t) {
361 module.exports.tests(impl, 'Iterator.zipKeyed', t);
362
363 t.end();
364 });
365 },
366 shimmed: function () {
367 test('Iterator.zipKeyed: shimmed', function (t) {
368 t.test('Function name', { skip: !functionsHaveNames }, function (st) {
369 st.equal(Iterator.zipKeyed.name, 'zipKeyed', 'Iterator.zipKeyed has name "zipKeyed"');
370 st.end();
371 });
372
373 t.test('enumerability', { skip: !defineProperties.supportsDescriptors }, function (et) {
374 et.equal(false, isEnumerable.call(Iterator, 'zipKeyed'), 'Iterator.zipKeyed is not enumerable');
375 et.end();
376 });
377
378 module.exports.tests(callBind(Iterator.zipKeyed, Iterator), 'Iterator.zipKeyed', t);
379
380 t.end();
381 });
382 }
383};
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