Want to know the testing process of VueJS application? Then here is the article that deals with Testing VueJS Application. Before we start the article let’s know why testing is necessary?
Why Testing is necessary?
Well, Testing helps you make sure all parts of your app work as expected. It gives you the confidence to ship often while being able to refactor later knowing you won’t break anything.
It also improves the quality of your code and works as documentation. But while these are totally valid reasons to test as well, we’d rather highlight developer confidence – it’s really the key thing (for us). Unit testing improves the maintainability of your code.
There are several types of tests.
- Unit tests – the smallest tests of single units (one assertion per test for one component)
- Integration tests that help see if the units work together
- End-to-end tests which basically simulate the experience real user of your app
Unit tests test the functionality of an individual unit of code isolated from its dependencies. They are the first line of defense against errors and inconsistencies in your codebase. Unit testing is a fundamental part of the Test-Driven Development (TDD) process.
While working with Vujs applications you should check some VueJS UI Component Libraries. Now let’s begin..!!
Vue-test-utils is the official library for (unit) testing your Vue components. It works with any of the test runners below (and also others!). If you use vue-cli, it can set your project up for unit tests with vue-test-utils – and also configure a testing framework like Jest. It also provides methods to mount and interact with Vue components in an isolated manner.
However, you need to use a separate package called Vue Test Utils to mount Vue components, and then Jest can be used to execute the components’ unit test.
Apart from running tests, Jest comes with loads of other features like code coverage, mocks, and snapshot testing.
Well, performance testing is a testing mechanism to measure and identify all the aforementioned performance-related bottlenecks. Vue Performance DevTools is a browser extension. This extension aims to inspect the performance of Vue components. Besides, It statistically checks a Vue component’s performance based on the measures collected by Vue using the `window.performance` API.
Some of the many uses of Vue Performance DevTools are as follows:
- Unmount or remove the component instances which are not being used.
- Inspect the factors which block or take more time after an operation has been started.
- Inspects the component, which takes more time to load.
Now, modern web applications are a combination of various sub-components and systems. Thus, it is challenging to test and diagnose errors in these complicated applications by examining the functional flow. Therefore, End-to-end testing was introduced to address this issue, and with E2E testing, you can ensure the application’s complete health from all perspectives.
It doesn’t matter whether your application is component-based, uses frontend components, or uses server rendering; Cypress is independent of any particular framework. Besides, it simulates the behavior of a regular user as if they were using your application.
To make your testing experience truly painless Cypress team has put a lot of thought when designing this end-to-end test runner. Built-in recording, simple CI setup, robust API, and many other features make Cypress a developer-friendly E2E tool.
You can also write end-to-end tests for the Vue application using the official @vue/CLI-plugin-e2e-cypres plugin. Apart from testing E2E using Cypress, you can use it to perform unit tests and integration tests as well.
Also, it provides functions that execute in a specific order and logs the results in the terminal window. In addition, It also cleans the state of the software being tested to ensure that test cases run independently of each other.
While it can be used with most assertion libraries, this one is commonly used with Chai, a popular assertion library for Node.js and the browser. Furthermore, It is super flexible and therefore maybe a bit more complex to set up.
So, here we listed down the best 5 tools for testing vuejs application. As there are a lot of tools and support available to help you set up your tests exactly as you want, these are the initial tools that you will need to do testings on vuejs applications.
Tell us which one is your pick in the comment section below.