NOTE: Test both clean install and upgrade.
NOTE: Test for each module individually.
# login to Admin Console
# go to {nav Configuration > Module Name > Search} section (replace `Module Name` with tested module)
# confirm, that `Meta Keywords` and `Meta Description` fields are present in there
# enable them for simple search and save changes
# go to {nav Website & Content > Structure & Data > Module Category} section (replace `Module Category` with primary module category)
# create sub-category in it
# in that sub-category create module item (e.g. product) with `Meta Keywords` and `Meta Description` fields filled in (the values must not overlap with other fields in same item)
# go to Front-End
# in search box on the left enter meta keywords
# confirm that module item was found using them
# in search box on the left enter meta description
# confirm that module item was found using them