If you have read all the chapters and have looked at the code examples, you may have noticed that, by now, we have discussed and built all the components necessary for a typical distributed application. It is the time to put all the components together and see whether they cooperate as expected. This process is called integration.
While doing this, we will look closely at assessing whether the application behaves according to the requirements. In cases where functional requirements are presented in an executable form (using the Cucumber framework, for example), we can run them and check whether all the checks pass. Many software companies follow a Behavior-Driven Development process and perform testing very early, sometimes even before any substantial amount of code is written (such tests fail, of course, but succeed as soon as the expected functionality...
