Discover an effective strategy for testing React components by categorizing them into UI, Business, and Page components. Learn how to organize your codebase to facilitate testing for maintainable code.
Learn how to prevent test suite breaks caused by translation changes through an innovative solution, ensuring resilience and flexibility in your testing approach.
This principle restricts direct access to the state of the object from outside. This means that the internal implementation details of a class are hidden. Accessing the state of the object is only allowed through its public API (public methods). This concept helps to protect the data from outside interference and ensures controlled and secure data manipulation.
One of the first mistakes I made when I started to test my code was to test private methods. Spoiler alert: it was a bad idea! If you need to test a private method, it probably means that your code is not well designed. Private methods are implementation details of objects and we should not care about them. When you test public methods you also test the private ones.
The inversion design pattern is quite simple and super powerful. It makes your code more modular. It lets you change a class's dependency to another one depending on the context. It is a good way to decouple your code from IO to make it testable.
Adding too many props will make your components complex, hard to understand and maintain. Instead opt for several small components and apply composition. Learn how in this blog article.
Sometimes, we depend on libraries that provide components which cannot be well rendered in the test environment. That means we cannot test some parts of an application. Learn how to use a React hook to prevent that problem and increase the application testability in this new blog article.
Bad tests are hard to maintain and they slow down your productivity. Test code quality is as important as production code. The builder or factory patterns can help you to improve your test code quality. It will ease test refactoring and make tests more readable.
Testing can be really difficult for beginners. The main reason is that your code probably uses IO. This blog post gives you tips about improving your code design to ease testing.
Exposing the object's state to test them is not a good idea. Comparing object instances is better because it avoids breaking encapsulation and it does not have any impact on their design.