In the previous paragraph, we set up a build process the main objective of which is to verify our code quality and create a release version of the source code. At this point, we need to complete this process introducing unit testing.
One of the most important GulpJS plugins is the Karma integration. Karma (http://karma-runner.github.io/) is a testing environment that provides a series of useful features for developers, such as:
It runs tests on different kinds of browsers (not only different vendors, but also devices, such as phones and tablets) or using a PhantomJS instance
It supports a series of unit testing frameworks, such as Jasmine, QUnit, and Mocha
It can be integrated in several development environments, such as IDEs and browsers, for example, Jetbrains Webstorm or Google Chrome Developer Tools
It can be integrated into several continuous integration systems, for example, Jenkins, Travis, or Semaphore
The first two features are the most...