That's an _integration_ failure. We're talking about testing two entirely different things here. Of course you shouldn't expect to test integration scenarios in

That's an _integration_ failure. We're talking about testing two entirely different things here. Of course you shouldn't expect to test integration scenarios in unit tests. But you also shouldn't expect to test all unit scenarios in integration tests. This is what the "trophy testing" model advocates for. That somehow unit tests are not needed if you have thorough integration tests, which is entirely false. They test the application at different layers, because they're meant to ensure behavior to different types of users. They're both useful for catching bugs and unexpected behavior, and they're meant to complement each other.