Sync web-platform-tests PR 14649 into mozilla-central (this bug is closed when the sync is complete). PR: https://github.com/web-platform-tests/wpt/pull/14649 Details from upstream follow. Robert Ma <robertma@chromium.org> wrote: > Produce a valid report when no tests are affected > > This is done in a roundabout way: > 1. Instead of early exiting, `wpt run` now continues to call wptrunner > when no tests are affected to make sure we have suite_start and > suite_end lifecycle events. > 2. However, wptrunner would then by default run all tests, so a new flag > is added to wptrunner to only run the given list of tests and do not > fail when no tests run. > > Fixes #14471 . > > P.S. I haven't looked into the tests yet (I'd expect some might break; or you reviewers would like to see new tests). Please first let me know if the general approach looks good. Thanks!

Pushed to try https://treeherder.mozilla.org/#/jobs?repo=try&revision=69089d26baf6d3cce4e9c643c0e65d0bcc5ded7b

Pushed to try https://treeherder.mozilla.org/#/jobs?repo=try&revision=4c20d509f5a73b412079699ebc9f7f62d6c82978

Pushed to try https://treeherder.mozilla.org/#/jobs?repo=try&revision=1016feffe4d2904b8b92fe44ee0951112ea378cb

The PR was not expected to affect any tests, but the try push wasn't a success. Check the try results for infrastructure issues

Pushed by james@hoppipolla.co.uk: https://hg.mozilla.org/integration/mozilla-inbound/rev/984da02c45f8 [wpt PR 14649] - Produce a valid report when no tests are affected, a=testonly

Pushed by james@hoppipolla.co.uk: https://hg.mozilla.org/integration/mozilla-inbound/rev/7e0785c0e88e [wpt PR 14649] - Produce a valid report when no tests are affected, a=testonly