1796154 - Add a test for in-memory policy engines, if the engine is removed we show a notification box to the user

Status: NEW

(Firefox :: Search, task, P3)

Description

[Mandy Cheang [:mcheang][she/her]]

After Mark finished his patches to make policy engines load on start up and be in-memory engines (see Bug 445134), there was a failure we didn't detect due to the code in SearchService#shouldDisplayRemovalOfEngineNotificaitonBox. All the tests were passing on TRY, however, https://searchfox.org/mozilla-central/source/toolkit/components/search/tests/xpcshell/test_remove_engine_notification_box.js should be updated to test for policy engines.

The regression: https://bugzilla.mozilla.org/show_bug.cgi?id=1796029
The patch that fixed the regression: https://phabricator.services.mozilla.com/D159670