tests/stress/static-getter-delete.js

   1 function shouldBe(actual, expected) {
   2     if (actual !== expected)
   3         throw new Error('bad value: ' + actual);
   4 }
   5
   6 function shouldThrow(func, errorMessage) {
   7     var errorThrown = false;
   8     var error = null;
   9     try {
  10         func();
  11     } catch (e) {
  12         errorThrown = true;
  13         error = e;
  14     }
  15     if (!errorThrown)
  16         throw new Error('not thrown');
  17     if (String(error) !== errorMessage)
  18         throw new Error(`bad error: ${String(error)}`);
  19 }
  20
  21 // Before static functions (& accessors) are reified.
  22 shouldThrow(function () {
  23     'use strict';
  24     RegExp.prototype.multiline = 'ok';
  25 }, 'TypeError: Attempted to assign to readonly property.');
  26
  27 (function () {
  28     'use strict';
  29     shouldBe(delete RegExp.prototype.global, true);
  30     shouldBe(RegExp.prototype.hasOwnProperty('global'), false);
  31     RegExp.prototype.global = 'hello'
  32     shouldBe(RegExp.prototype.global, 'hello');
  33 }());
  34
  35 // After static functions (& accessors) are reified.
  36 shouldThrow(function () {
  37     'use strict';
  38     RegExp.prototype.multiline = 'ok';
  39 }, 'TypeError: Attempted to assign to readonly property.');
  40
  41 (function () {
  42     'use strict';
  43     shouldBe(delete RegExp.prototype.multiline, true);
  44     shouldBe(RegExp.prototype.hasOwnProperty('multiline'), false);
  45     RegExp.prototype.multiline = 'hello'
  46     shouldBe(RegExp.prototype.multiline, 'hello');
  47 }());