Automation is the foundation that gives the power to get quick feedback from running tests. It gives us the ability to cover more code and know we didn’t break anything. And it gives us the independence to change our design when we need to without risk and to mold the software the way we want it.
In the end, the Agile Manifesto favors working software. Automated unit tests bring us close to that point quicker than other processes.
The benefits of unit testing are closely aligned with the principles of agile software development. Unit testing allows you to make code changes while remaining confident that they will not break existing functionality and that the major part of new functionality will work on first delivery. This enables frequent, timely delivery of working software, which in turn enables swift response to changes in requirements. Automated unit testing also promotes a transparent view into the code’s health by producing reports that allow anyone to see which problems occur and their precise locations in the code. Further, automated unit testing reduces the number of regression bugs, preventing development sprints from becoming bogged down and enabling developers to maintain a constant, sustainable work pace.
Together with the agile methodology, an integrated, automated unit testing tool that works well within your programming environment is a crucial necessity for managing modern software development.