Docker - Is There a Side Effect of Using the Test Harness?

A combination of using your test harness to do all the stuff and verify that things have happened. And then afterwards also just directly querying the data base, has this side effect, actually happened? Thats kind of patten. I quite often use wer to avoid testing any implementation detail, as we said, spinning things up in docka. But then the assert side is just the test is doing a direct query to theDataBase.