1829062 - Add "doh-rollout.doneFirstRun" to ignorePrefs.json, since it gets toggled in the background while tests are running

Status: RESOLVED FIXED

(Testing :: General, task)

Description

[Daniel Holbert [:dholbert] (PTO until 2/24)]

I just did a Try run with some Test-Verify tasks for (slightly-modified) test_bug1261673.html, and I got this failure back from one of the tasks:

TEST-UNEXPECTED-FAIL | /tests/dom/html/test/test_bug1261673.html | changed preference: doh-rollout.doneFirstRun

Here's the log with the failure:
https://treeherder.mozilla.org/logviewer?job_id=413088341&repo=try&lineNumber=3986

This test does not in fact toggle that pref (or have anything to do with that pref); instead, this pref apparently gets toggled in the background, lazily, on the first time we do some DoH (DNS-over-HTTPS) activity, or something like that.

So: this isn't really a legit test failure. We should add this pref to testing/mochitest/ignorePrefs.json

Comment 1

[Daniel Holbert [:dholbert] (PTO until 2/24)]

Attachment: Bug 1829062: Add "doh-rollout.doneFirstRun" to our list of prefs that are allowed to be persistently changed during test-verify testruns. r?jmaher

This pref gets toggled lazily in the background, without tests explicitly
setting it, so it's appropriate for us to ignore it when auditing for prefs
that have been persistently modified during a test run.

Comment 2

[Pulsebot]

Pushed by [e-mail]:
https://hg.mozilla.org/integration/autoland/rev/88638acd2532
Add "doh-rollout.doneFirstRun" to our list of prefs that are allowed to be persistently changed during test-verify testruns. r=jmaher DONTBUILD

Comment 3

[Cosmin Sabou [:CosminS]]

https://hg.mozilla.org/mozilla-central/rev/88638acd2532

Comment 4

[Intermittent Failures Robot]

1 failures in 4004 pushes (0.0 failures/push) were associated with this bug in the last 7 days.

Repository breakdown:

• try: 1

Platform and build breakdown:

• windows11-64-2009-qr: 1
  • debug: 1

For more details, see:
https://treeherder.mozilla.org/intermittent-failures/bugdetails?bug=1829062&startday=2023-04-17&endday=2023-04-23&tree=all