tests/stress/unscopables.js

   1 function test(actual, expected) {
   2     if (actual !== expected)
   3         throw new Error('bad value: ' + actual);
   4 }
   5
   6 (function () {
   7     var array = [];
   8     var unscopables = array[Symbol.unscopables];
   9
  10     test(typeof unscopables, "object");
  11     test(unscopables.__proto__, undefined);
  12     test(String(Object.keys(unscopables).sort()), "copyWithin,entries,fill,find,findIndex,keys,values");
  13 }());
  14
  15 (function () {
  16     var find = "Cocoa";
  17     var forEach = "Hidden";
  18     var array = [];
  19     test(typeof array.find, "function");
  20
  21     with (array) {
  22         test(typeof find, "string");
  23         test(find, "Cocoa");
  24         test(typeof forEach, "function");
  25         test(__proto__, Array.prototype);  // array's unscopables.__proto__ is undefined => false.
  26     }
  27 }());
  28
  29 (function () {
  30     var object = {
  31         [Symbol.unscopables]: {
  32             Cocoa: false,
  33             Cappuccino: true
  34         },
  35
  36         Cocoa: null,
  37         Cappuccino: null
  38     };
  39
  40     var Cocoa = "Cocoa";
  41     var Cappuccino = "Cappuccino";
  42     var toString = "toString";
  43
  44     with (object) {
  45         test(Cocoa, null);
  46         test(Cappuccino, "Cappuccino");
  47         test(toString, "toString");  // object.toString is hidden by unscopables.toString.
  48     }
  49
  50     object[Symbol.unscopables].Cocoa = true;
  51
  52     with (object) {
  53         test(Cocoa, "Cocoa");
  54         test(Cappuccino, "Cappuccino");
  55     }
  56 }());
  57
  58 (function () {
  59     var unscopables = Object.create(null);
  60     unscopables.Cocoa = false;
  61     unscopables.Cappuccino = true;
  62
  63     var object = {
  64         [Symbol.unscopables]: unscopables,
  65         Cocoa: null,
  66         Cappuccino: null,
  67         Matcha: null
  68     };
  69
  70     var Cocoa = "Cocoa";
  71     var Cappuccino = "Cappuccino";
  72     var Matcha = "Matcha";
  73     var toString = "toString";
  74
  75     with (object) {
  76         test(Cocoa, null);
  77         test(Cappuccino, "Cappuccino");
  78         test(Matcha, null);
  79         test(toString, Object.prototype.toString);
  80     }
  81
  82     object[Symbol.unscopables].Cocoa = true;
  83     object[Symbol.unscopables].Cappuccino = false;
  84     object[Symbol.unscopables].toString = true;
  85
  86     with (object) {
  87         test(Cocoa, "Cocoa");
  88         test(Cappuccino, null);
  89         test(toString, "toString");
  90         test(Matcha, null);
  91     }
  92 }());
  93
  94 (function () {
  95     var proto = Object.create(null);
  96     var unscopables = Object.create(proto);
  97     unscopables.Cocoa = false;
  98     unscopables.Cappuccino = true;
  99
 100     var object = {
 101         [Symbol.unscopables]: unscopables,
 102         Cocoa: null,
 103         Cappuccino: null,
 104         Matcha: null
 105     };
 106
 107     var Cocoa = "Cocoa";
 108     var Cappuccino = "Cappuccino";
 109     var Matcha = "Matcha";
 110     var toString = "toString";
 111
 112     with (object) {
 113         test(Cocoa, null);
 114         test(Cappuccino, "Cappuccino");
 115         test(Matcha, null);
 116         test(toString, Object.prototype.toString);
 117     }
 118
 119     object[Symbol.unscopables].Cocoa = true;
 120     object[Symbol.unscopables].Cappuccino = false;
 121     object[Symbol.unscopables].toString = true;
 122
 123     with (object) {
 124         test(Cocoa, "Cocoa");
 125         test(Cappuccino, null);
 126         test(toString, "toString");
 127         test(Matcha, null);
 128     }
 129
 130     proto.Matcha = true;
 131
 132     with (object) {
 133         test(Cocoa, "Cocoa");
 134         test(Cappuccino, null);
 135         test(toString, "toString");
 136         test(Matcha, "Matcha");
 137     }
 138 }());
 139
 140 (function () {
 141     var object = {
 142         get Cocoa() {
 143             throw new Error("bad trap");
 144         },
 145         Cappuccino: null
 146     };
 147
 148     object[Symbol.unscopables] = {
 149         Cocoa: true,
 150         Cappuccino: true
 151     };
 152
 153     var Cocoa = "Cocoa";
 154     var Cappuccino = "Cappuccino";
 155     var toString = "toString";
 156
 157     with (object) {
 158         test(Cocoa, "Cocoa");
 159     }
 160
 161     object[Symbol.unscopables].Cocoa = false;
 162
 163     var error = null;
 164     try {
 165         with (object) {
 166             Cocoa;
 167         }
 168     } catch (e) {
 169         error = e;
 170     }
 171     test(String(error), "Error: bad trap");
 172 }());
 173
 174 (function () {
 175     var object = {
 176         Cocoa: null,
 177     };
 178     Object.defineProperty(object, Symbol.unscopables, {
 179         get: function () {
 180             throw new Error("unscopables trap");
 181         }
 182     });
 183
 184     var Cocoa = "Cocoa";
 185     var Cappuccino = "Cappuccino";
 186
 187     var error = null;
 188     try {
 189         with (object) {
 190             Cocoa
 191         }
 192     } catch (e) {
 193         error = e;
 194     }
 195     test(String(error), "Error: unscopables trap");
 196
 197     with (object) {
 198         test(Cappuccino, "Cappuccino");
 199     }
 200 }());
 201
 202 (function () {
 203     var object = {
 204         [Symbol.unscopables]: {
 205             get Cocoa() {
 206                 throw new Error("unscopables trap");
 207             }
 208         },
 209         Cocoa: null,
 210     };
 211     var Cocoa = "Cocoa";
 212     var Cappuccino = "Cappuccino";
 213
 214     var error = null;
 215     try {
 216         with (object) {
 217             Cocoa
 218         }
 219     } catch (e) {
 220         error = e;
 221     }
 222     test(String(error), "Error: unscopables trap");
 223
 224     with (object) {
 225         test(Cappuccino, "Cappuccino");
 226     }
 227 }());
 228
 229 (function () {
 230     var object = {
 231         [Symbol.unscopables]: 42,
 232         Cocoa: "OK",
 233     };
 234     var Cocoa = "Cocoa";
 235
 236     with (object) {
 237         test(Cocoa, "OK");
 238     }
 239 }());