Agile drives frequent releases and frequent releases drive automated testing. You can't just switch on test automation though, there is a lot of investment in time and energy required and the payoff is usually in the medium to long term.
With the basic application in place it is now time to focus on testing. First up we add a Cucumber acceptance test. It is a good idea to keep your acceptance tests separate from your unit tests, so I tend to run them in the integration-test phase of Maven. To do this use the failsafe plugin, adding something like this to your pom: