How much are you testing your React components? The answer is different for every project, but generally, the more you test, the better. This article discusses integration, behavior, and snapshot testing. Depending on the component, you should run these tests before deploying your app. Using integration tests can prevent you from accidentally deploying a non-functional component. Also, integration tests are a good practice regardless of your development approach.
Snapshot testing
The first step in testing React components is to make them as easy to use as possible. This means that you should avoid using snapshot testing, which fails as soon as the component changes. Instead, you should use snapshot testing only if the component is stable and rarely changes. If you are unsure whether a component is stable or not, you can run end-to-end tests to make sure it works as intended.
Snapshot testing is the easiest to do, but you can easily waste time if you test the state before and after an action. This technique is great for catching regressions and documenting the intent behind an action. The disadvantage is that it does not test the action itself. It also uses very few resources. Nevertheless, if you are developing a new component, it’s better to test the whole app first, rather than just its individual components.
Alternatively, you can use Class components to test the React component in a test suite. Remember to test both methods and props of your React component. If you’re using Jest to test your components, make sure you commit the snapshot along with the code changes. If a snapshot fails, you’ll need to figure out what you’re changing, and overwrite the previous snapshot. The same goes for component testing.
Integration tests
When building a component, one of the most common questions is how much are you testing it? There are many ways to test a component. One common method is to generate a snapshot, or a copy of the component, and then compare it to another snapshot to see if things render correctly. This is a practical way to test your component structure, and is an improvement over using snapshots. If you use this method, your tests will be more comprehensive than snapshot tests.
Snapshot tests are a good way to test simple state and prop changes. A Tag component, for example, will render a TagForm if the user clicks on it. Make sure you test your component in all possible state and prop changes to ensure that it behaves as you expect it to. Make a list of the state and prop changes your component may experience and decide whether or not to use snapshots.
The React Testing Library is a great way to test React components. It works on top of DOM Testing Library, which gives you a lot of confidence that you have created tests that are valid. You can use the jest-dom to run jest tests without slowing down your team. This way, your tests will remain intact even when your team refactors them. It will also give you confidence that your refactoring efforts won’t break the tests.
Behavior tests
Depending on how much time you have available to test your component, you may decide to write your tests first. You may also choose to write tests first if it will fit better with your workflow. If you don’t want to write tests first, don’t worry! There are no hard and fast rules, so do whatever feels right. Read on to learn more about how to write tests in React. In this article, we’ll discuss some common testing mistakes.
Snapshot tests are great for a simple state change or prop change. Suppose a button is clicked on a Tag component. That component should behave appropriately in any state or prop change. Using snapshots will help you determine if you need to break your component down or use it in its entirety. This way, you’ll know which method is the best fit for your component. But if your component is complex or has multiple state changes, it is a good idea to break it up into several smaller ones and run them in parallel.
Tests help you identify bugs and identify issues. If you’re using react components, you should do some tests on them too. Using Jest is good for unit testing applications, but it’s not recommended for browser end-to-end tests. Enzyme is an end-to-end test tool, but you’ll need to install an adapter for your React version. But it’s worth it in the long run.
