third_party/WebKit/LayoutTests/fast/js/script-tests/array-sort-modifying-tostring.js

   1 description(
   2 "Test of array with toString() override that truncates array."
   3 );
   4
   5 var maxSize = 2000;
   6 var keepSize = 100;
   7 var digits = 4;
   8 var countToDelete = maxSize - keepSize;
   9
  10 var a = new Array(maxSize);
  11
  12 function do_gc() {
  13     if (window.GCController)
  14         return GCController.collect();
  15
  16     for (var i = 0; i < 1000; i++)
  17         new String(i);
  18 }
  19
  20 function Item(val) {
  21     this.value = val;
  22 }
  23
  24 function toString_Mutate() {
  25     a.splice(keepSize, countToDelete);
  26     do_gc();
  27     for (var i = keepSize; i < countToDelete; i++) {
  28         delete a[i];
  29     }
  30
  31     if ((this != undefined) && (this.value != undefined)) {
  32         var s = this.value.toString();
  33         if (s.length < digits)
  34             s = ('0000' + s).slice(-digits);
  35
  36         return s;
  37     } else
  38         return "Undef";
  39 }
  40
  41 function test() {
  42     for (var i = 0; i < a.length; i++) {
  43         a[i] = new Item(a.length - i - 1);
  44         a[i].toString = toString_Mutate;
  45     }
  46     try {
  47         a.sort();
  48     if (a.length == maxSize)
  49         testPassed("Array length is unchanged.");
  50     else
  51         testFailed("Array length should be " + maxSize + " but is " + a.length + ".");
  52
  53     var firstFailedValue = -1;
  54
  55     for (var i = 0; i < a.length; i++) {
  56         if (a[i].value != i) {
  57             firstFailedValue = i;
  58             break;
  59         }
  60     }
  61
  62     if (firstFailedValue == -1)
  63         testPassed("Array values are correct.");
  64     else
  65         testFailed("Array values are wrong, first bad value at index " + firstFailedValue + ", should be " + firstFailedValue + " was " + a[firstFailedValue].value + ".");
  66     } catch(er) {
  67         testFailed("Got exception processing sort()");
  68     }
  69
  70     for (var i = 0; i < a.length; i++) {
  71         a[i] = 0x42424242;
  72     }
  73 }
  74
  75 test();