This test checks some object construction cases, including 5939: final comma in javascript object prevents parsing. On success, you will see a series of "PASS" messages, followed by "TEST COMPLETE". PASS var foo = { 'bar' : 'YES' }; foo.bar is 'YES' PASS var foo = { 'bar' : 'YES', }; foo.bar is 'YES' PASS var foo = { 'bar' : 'YES' , }; foo.bar is 'YES' PASS var foo = { , 'bar' : 'YES' }; foo.bar threw exception SyntaxError: Parse error. PASS var foo = { 'bar' : 'YES',, }; foo.bar threw exception SyntaxError: Parse error. PASS successfullyParsed is true TEST COMPLETE