For many developers, testing is something that is taken as something less relevant and is an area where in general, most people don't want to think about. For these people there are always many reasons to support this and hardly any of them is a good reason. When we think about tests, unit testing, regression tests, E2E testing, integration testing or "jupiter testing" (as I have heard one day someone say), we are trying our best to make our application reliable for current and future changes.