Continuous Integration is one of the most used terminologies in today's software world. Wherever you go in the software world, everybody talks about continuous integration. So what is continuous integration?

Continuous Integration is the practice of integrating all of the software code in a shared repository; prepare an automated build for every commit, and run the automated tests without any manual effort. It helps developers to detect problems early in fail fast mode. Here, early means as soon as a developer commits the code; within a couple of seconds or minutes (as per the project size), continuous integration process will notify about the success or failure of the build. Since errors are caught in the early stages, it saves a lot of effort while performing integration and functional testing of the application.

In this chapter, we will explore the popular Continuous Integration tools, Jenkins and TeamCity. As this is a Gradle book, we will limit our discussion...