This test verifies the behaviour of Object.prototype.hasOwnProperty, as documented in ECMA-262 rev3 section 15.2.4.5. On success, you will see a series of "PASS" messages, followed by "TEST COMPLETE". PASS typeof {foo : 'yum'}.hasOwnProperty is "function" PASS ({foo : 'yum'}).hasOwnProperty('foo') is true PASS ''.hasOwnProperty('length') is true PASS ({foo : 'yum'}).hasOwnProperty('bar') is false PASS ({foo : 'yum'}).hasOwnProperty('toString') is false PASS ''.hasOwnProperty('toString') is false PASS successfullyParsed is true TEST COMPLETE