TESTS: fixed tests that were invalidated by the addition of doc-strings.
TESTS: fixed tests that were invalidated by the addition of doc-strings.

NikolayShubenkovProgSchool/red,iArnold/red,NikolayShubenkovProgSchool/red,red-eco/red,rheber/red,vehar/red,vehar/red,rheber/red,red-eco/red,iArnold/red