Add automated test for "Change the Icon Theme from Administer Page"

The manual test is here: https://test.xwiki.org/xwiki/bin/view/Administration%20Tests/Change%20the%20Icon%20Theme%20from%20Administer%20Page

The test verifies that changing the Icon Theme from Page Administration is working properly.

Matrix discussion: https://matrix.to/#/!ikPtGZaGWtyblizzlR:matrix.xwiki.com/$1646915978767Tffzh:matrix.xwiki.com?via=matrix.org&via=matrix.xwiki.com&via=caubin.fr

Ilie Andriuta: Hi! Continuing the manual tests migration, there is a test about checking if changing the Icon Theme from Page Administration is displaying properly: https://test.xwiki.org/xwiki/bin/view/Administration%20Tests/Change%20the%20Icon%20Theme%20from%20Administer%20Page
I've checked https://github.com/xwiki/xwiki-platform/blob/60ed72d56eb22e24243428a0455cccbed8dbb406/xwiki-platform-core/xwiki-platform-test/xwiki-platform-test-page/src/main/java/org/xwiki/test/page/IconSetup.java and https://github.com/xwiki/xwiki-platform/blob/fcb86c7dbed7488512688fdb3f47dc9a40745b48/xwiki-platform-core/xwiki-platform-icon/xwiki-platform-icon-test/xwiki-platform-icon-test-docker/src/test/it/org/xwiki/icon/test/ui/IconThemesRestIT.java but couldn't find automated tests for it.
Can you please confirm whether the automated test exists for it or not and maybe providing the link to it?

Thanks!
Vincent Massol: checking
Note: one good way to check this too Ilie Andriuta is to look for a PageObject class for the UI in question
in this case I guess if we had a PO for it, it would extend AdministrationSectionPage
we have ThemesAdministrationSectionPage
but it seems to only contain ColorThemes APIs
https://github.com/xwiki/xwiki-platform/blob/6668147f1178bde83232fc931b3b517b70ba6567/xwiki-platform-core/xwiki-platform-administration/xwiki-platform-administration-test/xwiki-platform-administration-test-pageobjects/src/main/java/org/xwiki/administration/test/po/ThemesAdministrationSectionPage.java#L37
so it's missing some get/setIconTheme() APIs
which seems to indicate that we don't have any UI tests to validate the usage of the UI for setting an Icon Theme
Ilie Andriuta:  I see, thanks, I will create a task for it