Hate being tested, otherwise (6)
I believe the answer is:
detest
'hate' is the definition.
('detest' can be a synonym of 'hate')
'tested otherwise' is the wordplay.
'otherwise' indicates an anagram.
'tested' is an anagram of 'DETEST'.
'being' is the link.
(Other definitions for detest that I've seen before include "Despise or loathe" , "Having a loathing" , "Loathe, hate intensely" , "Be unable to stand" , "Really dislike" .)