source: trip-planner-front/node_modules/object.assign/test/tests.js@ 6a80231

Last change on this file since 6a80231 was 6a3a178, checked in by Ema <ema_spirova@…>, 3 years ago

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[6a3a178]1'use strict';
2
3var hasSymbols = require('has-symbols/shams')();
4var forEach = require('for-each');
5var has = require('has');
6
7module.exports = function (assign, t) {
8 t.test('error cases', function (st) {
9 st['throws'](function () { assign(null); }, TypeError, 'target must be an object');
10 st['throws'](function () { assign(undefined); }, TypeError, 'target must be an object');
11 st['throws'](function () { assign(null, {}); }, TypeError, 'target must be an object');
12 st['throws'](function () { assign(undefined, {}); }, TypeError, 'target must be an object');
13 st.end();
14 });
15
16 t.test('non-object target, no sources', function (st) {
17 var bool = assign(true);
18 st.equal(typeof bool, 'object', 'bool is object');
19 st.equal(Boolean.prototype.valueOf.call(bool), true, 'bool coerces to `true`');
20
21 var number = assign(1);
22 st.equal(typeof number, 'object', 'number is object');
23 st.equal(Number.prototype.valueOf.call(number), 1, 'number coerces to `1`');
24
25 var string = assign('1');
26 st.equal(typeof string, 'object', 'number is object');
27 st.equal(String.prototype.valueOf.call(string), '1', 'number coerces to `"1"`');
28
29 st.end();
30 });
31
32 t.test('non-object target, with sources', function (st) {
33 var signal = {};
34
35 st.test('boolean', function (st2) {
36 var bool = assign(true, { a: signal });
37 st2.equal(typeof bool, 'object', 'bool is object');
38 st2.equal(Boolean.prototype.valueOf.call(bool), true, 'bool coerces to `true`');
39 st2.equal(bool.a, signal, 'source properties copied');
40 st2.end();
41 });
42
43 st.test('number', function (st2) {
44 var number = assign(1, { a: signal });
45 st2.equal(typeof number, 'object', 'number is object');
46 st2.equal(Number.prototype.valueOf.call(number), 1, 'number coerces to `1`');
47 st2.equal(number.a, signal, 'source properties copied');
48 st2.end();
49 });
50
51 st.test('string', function (st2) {
52 var string = assign('1', { a: signal });
53 st2.equal(typeof string, 'object', 'number is object');
54 st2.equal(String.prototype.valueOf.call(string), '1', 'number coerces to `"1"`');
55 st2.equal(string.a, signal, 'source properties copied');
56 st2.end();
57 });
58
59 st.end();
60 });
61
62 t.test('non-object sources', function (st) {
63 st.deepEqual(assign({ a: 1 }, null, { b: 2 }), { a: 1, b: 2 }, 'ignores null source');
64 st.deepEqual(assign({ a: 1 }, { b: 2 }, undefined), { a: 1, b: 2 }, 'ignores undefined source');
65 st.end();
66 });
67
68 t.test('returns the modified target object', function (st) {
69 var target = {};
70 var returned = assign(target, { a: 1 });
71 st.equal(returned, target, 'returned object is the same reference as the target object');
72 st.end();
73 });
74
75 t.test('has the right length', function (st) {
76 st.equal(assign.length, 2, 'length is 2 => 2 required arguments');
77 st.end();
78 });
79
80 t.test('merge two objects', function (st) {
81 var target = { a: 1 };
82 var returned = assign(target, { b: 2 });
83 st.deepEqual(returned, { a: 1, b: 2 }, 'returned object has properties from both');
84 st.end();
85 });
86
87 t.test('works with functions', function (st) {
88 var target = function () {};
89 target.a = 1;
90 var returned = assign(target, { b: 2 });
91 st.equal(target, returned, 'returned object is target');
92 st.equal(returned.a, 1);
93 st.equal(returned.b, 2);
94 st.end();
95 });
96
97 t.test('works with primitives', function (st) {
98 var target = 2;
99 var source = { b: 42 };
100 var returned = assign(target, source);
101 st.equal(Object.prototype.toString.call(returned), '[object Number]', 'returned is object form of number primitive');
102 st.equal(Number(returned), target, 'returned and target have same valueOf');
103 st.equal(returned.b, source.b);
104 st.end();
105 });
106
107 /* globals window */
108 t.test('works with window.location', { skip: typeof window === 'undefined' }, function (st) {
109 var target = {};
110 assign(target, window.location);
111 for (var prop in window.location) {
112 if (has(window.location, prop)) {
113 st.deepEqual(target[prop], window.location[prop], prop + ' is copied');
114 }
115 }
116 st.end();
117 });
118
119 t.test('merge N objects', function (st) {
120 var target = { a: 1 };
121 var source1 = { b: 2 };
122 var source2 = { c: 3 };
123 var returned = assign(target, source1, source2);
124 st.deepEqual(returned, { a: 1, b: 2, c: 3 }, 'returned object has properties from all sources');
125 st.end();
126 });
127
128 t.test('only iterates over own keys', function (st) {
129 var Foo = function () {};
130 Foo.prototype.bar = true;
131 var foo = new Foo();
132 foo.baz = true;
133 var target = { a: 1 };
134 var returned = assign(target, foo);
135 st.equal(returned, target, 'returned object is the same reference as the target object');
136 st.deepEqual(target, { a: 1, baz: true }, 'returned object has only own properties from both');
137 st.end();
138 });
139
140 t.test('includes enumerable symbols, after keys', { skip: !hasSymbols }, function (st) {
141 var visited = [];
142 var obj = {};
143 Object.defineProperty(obj, 'a', { enumerable: true, get: function () { visited.push('a'); return 42; } });
144 var symbol = Symbol('enumerable');
145 Object.defineProperty(obj, symbol, {
146 enumerable: true,
147 get: function () { visited.push(symbol); return Infinity; }
148 });
149 var nonEnumSymbol = Symbol('non-enumerable');
150 Object.defineProperty(obj, nonEnumSymbol, {
151 enumerable: false,
152 get: function () { visited.push(nonEnumSymbol); return -Infinity; }
153 });
154 var target = assign({}, obj);
155 st.deepEqual(visited, ['a', symbol], 'key is visited first, then symbol');
156 st.equal(target.a, 42, 'target.a is 42');
157 st.equal(target[symbol], Infinity, 'target[symbol] is Infinity');
158 st.notEqual(target[nonEnumSymbol], -Infinity, 'target[nonEnumSymbol] is not -Infinity');
159 st.end();
160 });
161
162 t.test('does not fail when symbols are not present', { skip: !Object.isFrozen || Object.isFrozen(Object) }, function (st) {
163 var getSyms;
164 if (hasSymbols) {
165 getSyms = Object.getOwnPropertySymbols;
166 delete Object.getOwnPropertySymbols;
167 }
168
169 var visited = [];
170 var obj = {};
171 Object.defineProperty(obj, 'a', { enumerable: true, get: function () { visited.push('a'); return 42; } });
172 var keys = ['a'];
173 if (hasSymbols) {
174 var symbol = Symbol('sym');
175 Object.defineProperty(obj, symbol, {
176 enumerable: true,
177 get: function () { visited.push(symbol); return Infinity; }
178 });
179 keys.push(symbol);
180 }
181 var target = assign({}, obj);
182 st.deepEqual(visited, keys, 'assign visits expected keys');
183 st.equal(target.a, 42, 'target.a is 42');
184
185 if (hasSymbols) {
186 st.equal(target[symbol], Infinity);
187
188 Object.getOwnPropertySymbols = getSyms;
189 }
190 st.end();
191 });
192
193 t.test('preserves correct property enumeration order', function (st) {
194 var str = 'abcdefghijklmnopqrst';
195 var letters = {};
196 forEach(str.split(''), function (letter) {
197 letters[letter] = letter;
198 });
199
200 var n = 5;
201 st.comment('run the next test ' + n + ' times');
202 var object = assign({}, letters);
203 var actual = '';
204 for (var k in object) {
205 actual += k;
206 }
207 for (var i = 0; i < n; ++i) {
208 st.equal(actual, str, 'property enumeration order should be followed');
209 }
210 st.end();
211 });
212
213 t.test('checks enumerability and existence, in case of modification during [[Get]]', { skip: !Object.defineProperty }, function (st) {
214 var targetBvalue = {};
215 var targetCvalue = {};
216 var target = { b: targetBvalue, c: targetCvalue };
217 var source = {};
218 Object.defineProperty(source, 'a', {
219 enumerable: true,
220 get: function () {
221 delete this.b;
222 Object.defineProperty(this, 'c', { enumerable: false });
223 return 'a';
224 }
225 });
226 var sourceBvalue = {};
227 var sourceCvalue = {};
228 source.b = sourceBvalue;
229 source.c = sourceCvalue;
230 var result = assign(target, source);
231 st.equal(result, target, 'sanity check: result is === target');
232 st.equal(result.b, targetBvalue, 'target key not overwritten by deleted source key');
233 st.equal(result.c, targetCvalue, 'target key not overwritten by non-enumerable source key');
234
235 st.end();
236 });
237};
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