I believe Microsoft's Pex [1] is an attempt to generate all the unit tests automatically. You can't do that with integration tests, because their number grows e

I believe Microsoft's Pex [1] is an attempt to generate all the unit tests automatically. You can't do that with integration tests, because their number grows exponentially with the number of paths in the code [2]. [1] https://www.microsoft.com/en-us/research/project/pex-and-moles-isolation-and-white-box-unit-testing-for-net/ https://www.microsoft.com/en-us/research/project/pex-and-mol... [2] http://blog.thecodewhisperer.com/permalink/integrated-tests-are-a-scam http://blog.thecodewhisperer.com/permalink/integrated-tests-...