Sometimes the difference between unit and integration test does not apply. Maybe because writing a mock is too complex or boring, or maybe you have an integration test already working and you want to use it as a unit test but the integration isn’t always available or it is slow and so on … A possible solution is “Parroting” the integrated part by creating automatically a mock when running the integration tests. A friend of mine, just realized such an idea: Wasp Parrots, even if at an early stage, it looks very promising.