js/src/tests/ecma_5/extensions/watch-array-length.js

   1 /*
   2  * Any copyright is dedicated to the Public Domain.
   3  * http://creativecommons.org/licenses/publicdomain/
   4  */
   5
   6 var hitCount;
   7 function watcher(p,o,n) { hitCount++; return n; }
   8
   9 var a = [1];
  10 a.watch('length', watcher);
  11 hitCount = 0;
  12 a.length = 0;
  13 reportCompare(1, hitCount, "lenient; configurable: watchpoint hit");
  14
  15 var b = Object.defineProperty([1],'0',{configurable:false});
  16 b.watch('length', watcher);
  17 hitCount = 0;
  18 var result;
  19 try {
  20     b.length = 0;
  21     result = "no error";
  22 } catch (x) {
  23     result = x.toString();
  24 }
  25 reportCompare(1, hitCount, "lenient; non-configurable: watchpoint hit");
  26 reportCompare(1, b.length, "lenient; non-configurable: length unchanged");
  27 reportCompare("no error", result, "lenient; non-configurable: no error thrown");
  28
  29 var c = Object.defineProperty([1],'0',{configurable:false});
  30 c.watch('length', watcher);
  31 hitCount = 0;
  32 var threwTypeError;
  33 try {
  34     (function(){'use strict'; c.length = 0;})();
  35     threwTypeError = false;
  36 } catch (x) {
  37     threwTypeError = x instanceof TypeError;
  38 }
  39 reportCompare(1, hitCount, "strict; non-configurable: watchpoint hit");
  40 reportCompare(1, c.length, "strict; non-configurable: length unchanged");
  41 reportCompare(true, threwTypeError, "strict; non-configurable: TypeError thrown");