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This assumes that MyCoolConcern doesn't depend on too many things in your main model class or in (god forbid) other concerns that you've included in that model.

Or, perhaps, to turn this argument around, it's better to say it this way: A Concern is poorly-constructed if it cannot be tested in isolation, so therefore something like MyCoolConcern should be written with its testability (inside of DummyClass) in mind.

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