Test for performance-timeline serializers. On success, you will see a series of "PASS" messages, followed by "TEST COMPLETE". PASS {"name":"test","entryType":"measure","startTime":"","duration":""} PASS Object.keys(JSON.parse(JSON.stringify(entry))).length is 4 PASS {"name":"test","entryType":"mark","startTime":"","duration":""} PASS Object.keys(JSON.parse(JSON.stringify(entry))).length is 4 PASS successfullyParsed is true TEST COMPLETE