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A nice idea of TDD is that of High and Low Gear. What they mean is that when you're just starting out you will write a lot of fine grained unit tests to get going, e.g against the domain layer.
Once you're at the point that you have encapsulated all use cases in a nice service layer, you can move all the specific domain tests to the service layer. This makes it easier to make modifications to the domain model.
If then you really need to make big changes, you write fine grained unit tests for those again, until you've encapsulated them in the service layer.
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