Testing is a whole topic in itself and many books, blogs, and websites are dedicated to it. The testing field has changed a lot since the beginning of the century: the testing industry evolved from manual validation (sometimes with even no test plan), to a heavily automated process. Automation is great in testing because it allows us to execute many tests in very little time. So, automated tests can be executed more often (on each commit instead of each release, for example). As a consequence, bugs are detected more rapidly, and fixing them is easier. At the end, the product is better and the developer can spend more time implementing new features.
Testing can mean many different things because there are different kinds of test:
- Unit tests verify that each function of the application works as expected
- Integration tests verify that the application works correctly with...