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The value of the unit test is only as good as the (mock) data you feed it. Your mocked object is great and all your units pass; A user asks for the bathroom and the bar burns down because the bathroom was never mocked. What value was added by that passing unit test?

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I wouldn't claim that unit tests are completely sufficient; you clearly also need integration tests. But you don't need all of your tests to be integration tests; in fact that would often be needlessly expensive and annoying.

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