I have both. 90% of my tests are normal unit tests that use mocks or fakes as needed to test the things I care about. 9% are integration type tests that validat

I have both. 90% of my tests are normal unit tests that use mocks or fakes as needed to test the things I care about. 9% are integration type tests that validate broad behaviors with my app’s direct dependencies in an ephemeral environment managed via docker compose (usually anyway). 1% is a couple end to end tests that validate the whole system at deploy time and beyond.