Test for function.name On success, you will see a series of "PASS" messages, followed by "TEST COMPLETE". PASS (function f() {}).name is 'f' PASS delete (function f() {}).name is false PASS (function() {}).name is '' PASS Math.name is undefined PASS Error.name is 'Error' PASS String.prototype.charAt.name is 'charAt' PASS document.getElementById.name is 'getElementById' PASS successfullyParsed is true TEST COMPLETE