Avoid return fucn() instead use t.Cleanup(fucn() {...}) part 2

What does this MR do?

This is the second MR of the related issue. This part includes other _test.go files. The Body's are already closed using testhelpers.Close() and now functions which are returned, are being used in t.Cleanup().

issue: #607 (closed)

MR part 1: !689 (merged)

TODO

• I added the Changelog trailer (e.g. Changelog: added) to the commits that need to be included in the changelog
• I added unit tests or they are not required
• I added acceptance tests or they are not required
• I added documentation (or it's not required)
• I followed code review guidelines
• I followed Go Style guidelines