tests/stress/object-get-own-property-descriptor-perform-to-object.js

   1 var primitives = [
   2     ["string", 6],
   3     [42, undefined],
   4     [Symbol("symbol"), undefined],
   5     [true, undefined],
   6     [false, undefined]
   7 ];
   8
   9 for (var [primitive, expected] of primitives) {
  10     var ret = Object.getOwnPropertyDescriptor(primitive, 'length');
  11     if (expected === undefined) {
  12         if (ret !== expected)
  13             throw new Error("bad value for " + String(primitive) + ": " + String(ret));
  14     } else if (ret.value !== expected)
  15         throw new Error("bad value for " + String(primitive) + ": " + String(ret));
  16 }
  17
  18 function canary() {
  19     return {
  20         called: false,
  21         toString() {
  22             this.called = true;
  23             throw new Error("out");
  24         }
  25     };
  26 }
  27
  28 [
  29     [ null, "TypeError: null is not an object (evaluating 'Object.getOwnPropertyDescriptor(value, property)')" ],
  30     [ undefined, "TypeError: undefined is not an object (evaluating 'Object.getOwnPropertyDescriptor(value, property)')" ]
  31 ].forEach(function ([value, message]) {
  32     var property = canary();
  33     var error = null;
  34     try {
  35         Object.getOwnPropertyDescriptor(value, property);
  36     } catch (e) {
  37         error = e;
  38     }
  39     if (!error)
  40         throw new Error("error not thrown");
  41     if (String(error) !== message)
  42         throw new Error("bad error: " + String(error));
  43 });