In this chapter, we saw how important testing is. Thankfully, there are great tools available in the Node.js ecosystem. Frameworks such as Jasmine and Mocha make our life easier. Instruments such as Phantom.js save a lot of time by automating the testing and putting our code in a browser context. With DalekJS, we can even run tests directly in Firefox, Google Chrome, or Internet Explorer.
In the next chapter, we will see how to write flexible and modular CSS. Node.js has few great modules oriented for the frontend developers who write a lot of CSS.