Mocha runs independently from the assertion library, so you can choose which assertion format works best for you.
Mocha most often is run in combination with assertion library Chai.
No need to write tricky statements for Async testing. Mocha gives you a done callback. Place this done parameter in your callback function, that'll let Mocha know that you've written an asynchronous function.
The Mocha test framework itself runs on NodeJS, hence it makes everything related to it extremely simple. With Mocha's simple syntax and speed, testing your node.js app just got a whole lot easier.
While some testing frameworks are complete out of the box, Mocha requires developers to select and set up assertion libraries and mocking utilities. For someone who is just starting to learn how to build tests this can be scary as they will also have to choose which libraries to use and learn them too.
Mocha has multiple test reporters built in and you can create your own as well. The test reporters have full color and makes it easy to see if your tests fail or not.
Aside from the numerous benefits with generators in your application, You can now also integrate generators into your test suite. By using mocha, all you have to do is enable support for generators.
It's great for testing UI.
It is also convenient for asserting complex data objects, as it doesn't require developers to manually compose the expected value.
If you're new to unit testing and are trying to understand unit testing within the React ecosystem, specifically ReactNative, it is going to be a challenge. The Jest doc dives right into making tests without any primer on how to go from concept to implementation.
Like almost everything else release by Facebook (unfortunately), Jest has terrible documentation. It has a very basic example where everything is explained poorly. It doesn't explain most concepts or how everything fits together.
Code readability is an important factor, if the application development involves multiple teams; if the testing team is unable to read your test cases then they won't be able to test it. Jasmine resolves this issue by providing developers with an extremely simple and "human-friendly" syntax.
If you have some test cases that do not involve testing of DOM elements or events, those are exactly the ones where you want to use Jasmine. It'll provide smooth, simple and easy DOM-less testing of those test cases.
Jasmine comes with everything already baked in (including assertion libraries and mocking utilities). While this is great for beginners and people who don't want to spend much time looking into different libraries and tools it can be a turnoff for anyone who wants to use a different assertion and/or mocking library.
QUnit expects you to call start() before an async function and stop() once it has stopped. This can be problematic when you have no way of knowing when exactly your function will start or stop.
If you want your tests to run in the order you have provided (maybe if your tests are ordered in such a way that your current test relies on the previous one), you can do so by setting QUnit.config.reorder = false and the tests will run in the order that you have provided.
All frontend developers already know the ease that jQuery framework has brought to their lives, in handling DOM events and accessing elements. Since Qunit was built as a part of jquery (is even used by jQuery itself for unit testing) hence it makes testing of DOM elements a lot easier.
All you have to do is to include the QUnit library either from the CDN or from the local server and then create your testcases.js file and run it.
The outputs will be displayed in a nice format in the browser.
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