As we are now approaching the end of this journey, we must see how to consolidate the work. In the real world, tests must be written before a feature is developed (or at least at the same time). Writing automated tests in software development conveys a massive confidence about the application state. It is the best way of ensuring that nothing has been forgotten. Having a system that has the ability to test itself, with the help of modern continuous integration tools, ensures that features will not be damaged at any time.

Manual testing through UI cannot be trusted to cover every single edge case that a developer has to think about. It is the responsibility of the developer to secure all the breaches and to cover all the possible paths, and this is a big responsibility.

Our developer job is an amazing job. The perpetual technology enhancement sets an incomparable pace for every one of us—to stay in the race, to respond to the market, and sometimes to lead the market.

Our job is made of long hours of intense focus, search for information, design, redesign, and so on. Writing tests brings a healthy stability in the cycle. It allows us to finish our day happier with the features we develop, even weeks and months later.