@thirstybear @tdpauw @samir @mrksdck I disagree that e2e tests have to be slow. In the days of Oracle / SQL Server, yes, but eg Mongo’s in-memory mode (added >10y ago) means API acceptance tests took ms to run, and under a minute for the entire suite. You could do outside-in and add unit tests for the gaps. The is exactly how the GOOS book talks about working.