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The goal is to check every aspect of the function to make sure it all works properly for all cases. But many developers prefer to be safe rather than sorry, and it’s always good to double-check work.Įvery unit test is made to check against an individual unit in JavaScript, which typically breaks down to a function or library. Not every JS project will need a unit test. Smashing Magazine has a great example which tests a calendar date output function based on a specific type of input. Simple JS unit testing will take a function, monitor output and return its behavior. JavaScript is true scripting and with new resources like Node.js and TypeScript it’s becoming much more powerful. There’s no need to unit test for HTML/CSS because they’re not function-based languages. Let’s go a bit deeper into unit testing for JS and see how this can be accomplished. The easiest way to handle this is with separate JS libraries.īut how do you actually write unit tests and get some value out of them? The answer is different based on your code, so a C++ dev has a different methodology than a JavaScript dev. In the world of JavaScript things can get a little trickier because it runs on the frontend of a webpage.
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