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Re:TDD is dead. Long live testing. by mattgreenrocks on Wednesday April 23, 2014 @09:19AM (#7633732)
> I haven't come across much about good design of tests (suggestions very much welcome)

Growing Object-Oriented Software Guided By Tests is worth a start. The authors use TDD, but that shouldn't put you off from learning the theory of separating concerns enough to write fewer tests.

Re:TDD is dead. Long live testing. by penland on Wednesday April 23, 2014 @09:53AM (#7633920)
+1 - that's an outrageously good book.