Add test for interfaces/webtransport.idl

[stephenmcgruer]

Closes #25764

[foolip]

@stephenmcgruer have you checked the wpt-chrome-dev-stability failure? Feel free to merge if it's bogus.

[stephenmcgruer]

Ooo, it's flaky, fun!

 0:42.54 INFO ## Unstable results ##
 0:42.54 INFO |                 Test                 | Subtest |          Results          | Messages |
 0:42.54 INFO |--------------------------------------|---------|---------------------------|----------|
 0:42.54 INFO | `/web-transport/idlharness.any.html` |         | **ERROR: 9/10, OK: 1/10** |          |

Ah, there's a race in whether the QuicTransport class realizes there's no connection I think; ERROR /web-transport/idlharness.any.html - Unhandled rejection: Connection lost..

To do properly we need the QUIC server up. Since that's coming soon, I think I'm going to punt on this till then, sorry for pinging you over it too early.

[foolip]

@stephenmcgruer the QUIC server exists now, right?

[stephenmcgruer]

@Hexcles - is the quic server usable now?

[Hexcles]

It's not enabled yet because of a cert issue.

Regardless, this test should have a label and be skipped if the QUIC server isn't available.

[stephenmcgruer]

Regardless, this test should have a label and be skipped if the QUIC server isn't available.

Ack, but I sorta need the quic server available to develop the test 😆

[Hexcles]

Oh I guess you'd need to wait just a bit longer then :)

Besides, I'm not even sure QUIC is enabled on the Chrome side even with --enable-experimental-web-platform-features. There were a couple of more flags needed according to #22844 (comment)

[stephenmcgruer]

@Hexcles What's are the plans on making QUIC available for wpt.fyi runs? Looks like these all get marked SKIP with the quic flag added (note that the test still needs work, but little point if they're just going to be skipped ;)).

EDIT: s/h2/quic

[Hexcles]

This is blocked by w3c/webtransport#125

[wpt-pr-bot]

There are no reviewers for this pull request. Please reach out on W3C's irc server (irc.w3.org, port 6665) on channel #testing (web client) to get help with this. Thank you!

[foolip]

Hmm, this is still SKIP on wpt.fyi: https://wpt.fyi/results/webtransport/idlharness.any.html?label=pr_head&max-count=1&pr=22852

[foolip]

The test now works enough to be useful: https://wpt.fyi/results/webtransport/idlharness.any.html?label=pr_head&max-count=1&pr=22852

QUIC avoided, left as TODO