The initial implementation of "test verification" only runs on Linux. Running on Windows and OSX should find intermittent issues specific to those platforms, providing benefit to overall test reliability. The main - maybe only - issue preventing test verification on these platforms is that the mozharness support for test verification relies on environment variables GECKO_HEAD_REPOSITORY and GECKO_HEAD_REV, which do not appear to be available in Windows and OSX taskcluster environments.

These environment variables are already present for Linux tests (docker-worker). TV needs them to determine which files were changed on the push.

I want to run test-verify as tier 3 on windows and osx for a week or so, then upgrade to tier 2. https://treeherder.mozilla.org/#/jobs?repo=try&revision=e029489de65da81135258acfdd3e82cc4b2aa7d2&filter-tier=1&filter-tier=2&filter-tier=3

Pushed by gbrown@mozilla.com: https://hg.mozilla.org/integration/mozilla-inbound/rev/cab89f775c6b Add GECKO_HEAD_REPOSITORY/REV to mozharness environment for tests on generic worker; r=jmaher https://hg.mozilla.org/integration/mozilla-inbound/rev/1eca387652fe Run test-verify on Windows and osx, as tier 3; r=jmaher

https://hg.mozilla.org/mozilla-central/rev/cab89f775c6b https://hg.mozilla.org/mozilla-central/rev/1eca387652fe