Exceptional test cases create records (9)

I believe the answer is:

cassettes

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'records' is the definition.
The answer and definition can be both man-made objects as well as being plural nouns.
Perhaps they are linked in a way I don't understand?

'exceptional test cases' is the wordplay.
'exceptional' indicates an anagram (an unusual or exceptional ordering of the letters).
'test'+'cases'='testcases'
'testcases' anagrammed gives 'CASSETTES'.

'create' acts as a link.

Can you help me to learn more?

(Other definitions for cassettes that I've seen before include "Music tapes" , "Containers for magnetic tapes" , "Containers to hold magnetic tape" .)

I've seen this clue in The Globe and Mail.

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