It's very simple: you test things because we can't rely 100% on developers to create the right thing or to create it without any bugs. The same goes for automat

It's very simple: you test things because we can't rely 100% on developers to create the right thing or to create it without any bugs. The same goes for automated test software. I've personally created unit tests that were failing for like 2 years but due to a bug still showed green in CI. To go back to the joke: manual QA is infinitely more likely to find the exploding bathroom than a unit test would ;) Automated testing is a fantastic tool, but manual QA is still very valuable.