W3C Web Platform Tests in Blink Web Tests

This directory contains checked out and reduced code from web-platform-tests (https://github.com/web-platform-tests/wpt/) required to run WPT tests as part of Blink's test infrastructure and some maintenance/configuration code.

For licensing, see README.chromium

Files in this directory (non third-party)

README.chromium

Parseable details on the project name, URL, license, etc.

README.md

This file.

wpt.config.json

The configuration file used when running WPTServe. Note that this file loads after wpt/config.default.json and this configuration gets merged onto it. When changing the ports (HTTP/S, WS/S), make sure to also:

update WPT_HOST_AND_PORTS in //third_party/blink/tools/blinkpy/web_tests/port/driver.py
update WebTestContentBrowserClient::GetOriginsRequiringDedicatedProcess()

checkout.sh

Running this script without arguments will remove the existing checkout (//third_party/wpt_tools/wpt) and perform a fresh one. See “Rolling in WPT”.

WPTIncludeList

The explicit list of files being kept, everything else not on this list is deleted when running “./checkout.sh reduce”. Use this file to control what gets checked in and try to keep the list as small as possible (use what you need).

certs/

This directory contains a private key and a certificate of WPTServe, and files for self-signed CA. By default, WPTServe generates these files using the “openssl” command, but we check in pre-generated files to avoid “openssl” dependency.

These certificates will expire in January 2025. Here is an instruction to re-generate them:

Make sure the following commands are in $PATH.

base64
git
grep
openssl
sed

Run update_certs.py
Look at the “Not After” date in the output of the command, and update “January 2025” in this document and expiration_date in wptserve.py to new expiration date.
Update certs/127.0.0.1.sxg.*. Please refer to //third_party/blink/web_tests/http/tests/loading/sxg/resources/README.md
git commit
git cl upload, etc.

Rolling in WPT

If there are new files that need to be rolled in, add the intended files to the WPTIncludeList. Ensure these files are in the correct order by running “LC_ALL=C sort WPTIncludeList”.

When rolling in new versions of WPT support, modify WPT_HEAD in checkout.sh to the desired HEAD position. You can then call “./checkout.sh clone” which will pull in all the code.

It is also important to update the hashes in the ‘Version:’ fields of //third_party/wpt_tools/README.chromium. While you're in this file, look at the “Local Modifications” section which lists ways in which Chromium has diverged from WPT. Make sure these modifications are persisted when reviewing the changes being made.

You can examine what's pulled in and update WPTIncludeList if some new files are required to run the updated version.

Once you've cloned the repositories you can call “./checkout.sh reduce” to remove everything that is not listed in WPTIncludeList.

Note that calling “./checkout.sh” without arguments is equivalent of calling “./checkout.sh clone reduce”.

Configuration

Read instructions in WPT README: https://github.com/web-platform-tests/wpt/blob/master/README.md

Also, check out the WPTServe Documentation (https://wptserve.readthedocs.org/en/latest/).

Note that editing /etc/hosts is not required for run_web_tests.py since content_shell is invoked with flags to map all *.test domains to 127.0.0.1.

Running web-platform-tests with enabled WPTServe on a local machine

WPTServe is now enabled by default in run_web_tests.py for tests that live in web_tests/external/wpt.

WPTServe starts HTTP/S and WS/S servers as separate processes.

The content_shell used to run the tests will receive the URL of each test (instead of a filename). The document root http://web-platform.test/ maps to web_test/external/wpt. HTTPS tests are enabled by default.

Example run:

./tools/run_web_tests.py external/wpt