[webkit-dev] Another WPT bite

Ryosuke Niwa rniwa at webkit.org
Tue May 9 12:54:49 PDT 2017

On Tue, May 9, 2017 at 11:06 AM, Maciej Stachowiak <mjs at apple.com>
> If we run all the w3c-imported web platform tests under a web server, then
> obviously we only need one directory. My understanding is that we don't run
> them under a server at all. So it seems like one part of this proposal is
> "run everything under LayoutTests/imported/w3c/ from a web server".

We currently run all web-platform-tests using WPT server. In theory,
there's nothing preventing us from running these tests using file://
so long as tests don't rely on the networking aspect. However, we
don't currently rewrite URLs to testharness.js and
testharness-report.js both of which refers to the top-level directory
at the moment.

IMO, the entirety of the effort to make these imported tests runnable
in file scheme should be about re-enabling these URL rewrites that got
broken sometime ago.

> I think it would be cleaner to have a separate directory of tests intended
> for import, separate from imported tests.

You mean intended for exports?
> It could be right next to imported/w3c/web-platform-tests. I think mixing tests that are imported from
> upstream and tests intended for eventual upstreaming is more confusing than
> helpful.

Okay. I've actually advocated for this approach for the same reason.

One annoying thing in this approach is that if we wanted to add a test
to, say, html/infrastructure/conformance-requirements/extensibility/
then we either have to mirror the same directory structure in this
upstream directory, or add some sort of WebKit-only annotation that
this test needs to be added there for the upstream process to be

> One question I have is whether web platform tests can run under a regular
> HTTP server (maybe with appropriate configuration) or do we need something
> special? Is the WPT server more than just a web server with specific
> configuration settings?

No. Most of web-platform-tests that do require HTTP access have an
accompanying Python file which use WPT server's functionality as far
as I know.

In fact, I'd even argue that we should try to use the WPT server for
writing tests for Web APIs and security checks since those tests would
be extremely valuable for other browser vendors as well.

- R. Niwa

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