It depends. For a lot of applications, the integration is 99% of the app. Trying to unit test that just ends up testing whether you believe the other end of the

It depends. For a lot of applications, the integration is 99% of the app. Trying to unit test that just ends up testing whether you believe the other end of the integration behaves the way you believe it behaves. It's like having a test that verifies the hash of the executable binary. It tells you that something has changed, but not whether or not that change is desirable.