LayoutTests/ietestcenter/Javascript/TestCases/11.4.1-4.a-3.js

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/*
This test is actually testing the [[Delete]] internal method (8.12.8). Since the
language provides no way to directly exercise [[Delete]], the tests are placed here.
*/

ES5Harness.registerTest( {
id: "11.4.1-4.a-3",

path: "TestCases/chapter11/11.4/11.4.1/11.4.1-4.a-3.js",

description: "delete operator returns false when deleting a non-configurable data property",

test: function testcase() {
  var o = {};
  var desc = { value : 1, configurable: false }; // all other attributes default to false
  Object.defineProperty(o, "foo", desc);
  
  // Now, deleting o.foo should fail because [[Configurable]] on foo is false.
  var d = delete o.foo;
  if (d === false && o.hasOwnProperty("foo") === true) {
    return true;
  }
 },

precondition: function prereq() {
  return (fnExists(Object.defineProperty) && fnExists(Object.hasOwnProperty));
 }
});