test262 tests

[michaelficarra]

Tests should be added to https://github.com/tc39/test262/tree/master/test/built-ins/Symbol

[gsathya]

@michaelficarra are you planning on adding test262 tests for this?

@joyeecheung is implementing this in V8 now and we'd like test262 tests before we ship.

[michaelficarra]

Yeah, I had forgotten about this. I'll try to get around to it some time this week. Also, this might be a good opportunity for new contributors.

[joyeecheung]

I'd be happy to try working on the tests!

[michaelficarra]

@joyeecheung Cool! I am awaiting your PR. Let me know if you need help. Remember to test the missing description case.

[michaelficarra]

Fixed by tc39/test262#1590. Thanks @joyeecheung.