e/Characterization test

Information
has gloss	eng: In computer programming, a characterization test is a means to describe (characterize) the actual behaviour of an existing piece of software, and therefore protect existing behaviour of legacy code against unintended changes via automated testing. This term was coined by Michael Feathers in his book Working Effectively with Legacy Code (ISBN 0-13-117705-2).
lexicalization	eng: characterization test
instance of	c/Legacy systems