third_party/WebKit/LayoutTests/fast/js/script-tests/constructor-attributes.js

   1 description(
   2 "This test checks that constructor properties are not enumeratable, but are writable deletable."
   3 );
   4
   5 function canEnum(object, propertyName)
   6 {
   7     for (prop in object)
   8         if (prop == propertyName)
   9             return true;
  10     return false;
  11 }
  12
  13 function checkConstructor(expression)
  14 {
  15     shouldBe(expression + ".hasOwnProperty('constructor')", "true");
  16     shouldBe("canEnum(" + expression + ", 'constructor')", "false");
  17     shouldBe("x = " + expression + "; x.constructor = 4; x.constructor", "4");
  18     shouldBe("x = " + expression + "; delete x.constructor; x.hasOwnProperty('constructor')", "false");
  19 }
  20
  21 checkConstructor("(function () { }).prototype");
  22 function declaredFunction() { }
  23 checkConstructor("declaredFunction.prototype");
  24 checkConstructor("(new Function).prototype");
  25
  26 checkConstructor("Array.prototype");
  27 checkConstructor("Boolean.prototype");
  28 checkConstructor("Date.prototype");
  29 checkConstructor("Error.prototype");
  30 checkConstructor("EvalError.prototype");
  31 checkConstructor("Function.prototype");
  32 checkConstructor("Number.prototype");
  33 checkConstructor("Object.prototype");
  34 checkConstructor("RangeError.prototype");
  35 checkConstructor("ReferenceError.prototype");
  36 checkConstructor("RegExp.prototype");
  37 checkConstructor("String.prototype");
  38 checkConstructor("SyntaxError.prototype");
  39 checkConstructor("TypeError.prototype");
  40 checkConstructor("URIError.prototype");
  41
  42 checkConstructor("document.createTextNode('')");