I find that integration tests tend to have a much higher set up cost (especially if you are serious about test isolation), but that cost is amortized over the l

I find that integration tests tend to have a much higher set up cost (especially if you are serious about test isolation), but that cost is amortized over the lifetime of the project because the code is much more reusable. Unit tests are less expensive to set up on a per test basis but the code is less reusable and the ongoing maintenance tends to be higher.