tests/stress/arguments-bizarre-behaviour-disable-enumerability.js

   1 function foo(x) {
   2     Object.defineProperty(arguments, 0, {configurable: true, enumerable: false, writable:true, value:42});
   3     return [x, arguments[0], arguments]
   4 }
   5
   6 var result = foo(1);
   7
   8 if (result[0] !== 42)
   9     throw new Error();
  10
  11 if (result[1] !== 42)
  12     throw new Error();
  13
  14 if (Array.prototype.join.call(result[2], ",") != "42")
  15     throw new Error();
  16
  17 var array = [];
  18 for (var s in result[2])
  19     array.push(s);
  20
  21 if (array.join(",") != "0")
  22     throw new Error();
  23
  24 if (Object.keys(result[2]).join(",") != "0")
  25     throw new Error();
  26
  27 // FIXME: This is totally weird!
  28 // https://bugs.webkit.org/show_bug.cgi?id=141952
  29 if (Object.getOwnPropertyDescriptor(result[2], 0).enumerable !== true)
  30     throw new Error();