I would disagree. Unit tests make sure your code is clean and composable. It's hard to write unit tests if you have hundred line methods etc. It usually forces

I would disagree. Unit tests make sure your code is clean and composable. It's hard to write unit tests if you have hundred line methods etc. It usually forces you to write smaller chunks of code. Integration tests make sure it works in test/prod. You can have a complete spaghetti mess and still pass your integration tests. You can also have good unit test coverage but break prod. They serve two different purposes.