The Tor Browser / file revision

 // Test for the shell's FakeDOMObject constructor. This test

 // ensures the fuzzers know about this object.

 function f() {

     var res = 0;

     var d = new FakeDOMObject();

     assertEq(d !== new FakeDOMObject(), true);

     for (var i=0; i<100; i++) {

 	var x = d.x;

 	assertEq(typeof x, "number");

 	d.x = 10;

 	d.x = undefined;

 	d.x = FakeDOMObject.prototype.x;

 	FakeDOMObject.prototype.x = d.x;

 	FakeDOMObject.prototype.doFoo();

 	assertEq(d.doFoo(), 0);

 	assertEq(d.doFoo(1), 1);

 	assertEq(d.doFoo(1, 2), 2);

     }

 }

 f();