# Preparations
* in IDE:
# create `/themes/advanced/test.tpl` template
* in Admin Console
# go to {nav Configuration > Website > Themes} section
# press `Rescan Themes` toolbar button
# Part 1
# login to Admin Console
# go to {nav Website & Content > Structure & Data} section
# confirm, that:
# category with `_Auto: test` name exists
# the `_Auto: test` category has `test` in `Template` column in grid
# the `_Auto: test` category has semi-transparent red icon (means not visible in menu + theme bound)
# open `_Auto: test` category for editing
# press `Save` button on toolbar
# confirm, that saving was successful
# open `_Auto: test` category for editing
# change value in `Template File` textbox from `test` into `test_bad`
# press `Save` button on toolbar
# confirm, that saving failed due validation error on `Template File` field is triggered about non-existing test_bad` template
# close editing window
# Part 2
# login to Admin Console
# go to {nav Website & Content > Structure & Data} section
# delete `_Auto: test` category
# open `Forums` category (should have yellow icon in grid) for editing
# change category type from `Virtual` into `Template`
# specify `test` in `Template File` field
# press `Save` button on toolbar
# confirm, that saving was successful
# confirm, that saved category now has red icon in grid
# open `Forums` category (should have red icon in grid) for editing
# change value in `Template File` textbox from `test` into `test_bad`
# press `Save` button on toolbar
# confirm, that saving failed due validation error on `Template File` field is triggered about non-existing test_bad` template
# change category type from `Template` into `Virtual`
# specify `in-bulletin/designs/section` in `Template` dropdown
# press `Save` button on toolbar
# confirm, that saving was successful
# confirm, that saved category now has yellow icon in grid