LayoutTests/ietestcenter/Javascript/TestCases/15.4.4.15-8-9.js

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ES5Harness.registerTest( {
id: "15.4.4.15-8-9",

path: "TestCases/chapter15/15.4/15.4.4/15.4.4.15/15.4.4.15-8-9.js",

description: "Array.prototype.lastIndexOf must return correct index (Sparse Array)",

test: function testcase() {
  var a = new Array(0,1);  
  a[4294967294] = 2;          // 2^32-2 - is max array element index
  a[4294967295] = 3;          // 2^32-1 added as non-array element property
  a[4294967296] = 4;          // 2^32   added as non-array element property
  a[4294967297] = 5;          // 2^32+1 added as non-array element property
  // stop searching near the end in case implementation actually tries to test all missing elements!!
  a[4294967200] = 3;          
  a[4294967201] = 4;         
  a[4294967202] = 5;         


  return (a.lastIndexOf(2) === 4294967294 &&    
      a.lastIndexOf(3) === 4294967200 &&
      a.lastIndexOf(4) === 4294967201 &&
      a.lastIndexOf(5) === 4294967202) ;
   },

precondition: function prereq() {
  return fnExists(Array.prototype.lastIndexOf);
 }
});