Reduced test case for https://bugs.webkit.org/show_bug.cgi?id=83818 On success, you will see a series of "PASS" messages, followed by "TEST COMPLETE". PASS a[0] is 0x0505 PASS a[0] is 0x0005 PASS a[1] is 0x0005 PASS successfullyParsed is true TEST COMPLETE