What are your best front-end code testing tips for React, Angular, or Vue?

Selecting the right tools for front-end code testing in frameworks like React, Angular, or Vue is crucial to streamline your testing process and ensure effective quality assurance. Here's a brief guide to choosing the right tools for your project. 1. Testing Frameworks 2. Testing Libraries 3. Mocking Libraries 4. Assertion Libraries 5. Continuous Integration (CI) Tools 6. Code Coverage Tools

Most libraries and frameworks will come with a testing library already configured. An example would be Jest and Cypress. When starting a new project, unit testing is the easiest to start with. It is important to start testing as soon as possible. In addition, use a tool to track test coverage. If you have an existing project and you're trying to make progress, you can apply code coverage analysis on only new and modified code. So over time, you will increase your code coverage. Your toolset will slowly grow with your project. You do not need to start with everything from the beginning.

You should also consider incorporating code reviews as an integral part of your development process. Code reviews offer multiple benefits, including the identification of potential issues, knowledge sharing among team members, and maintaining consistent coding standards. They provide a fresh perspective and ensure that the codebase remains clean, maintainable, and aligned with the project's goals. Integrating code reviews early can save time and effort in the long run by catching issues before they become more complex to fix

If you're having difficulting testing writing tests, it's because you're not writing testable code. You should consider how you will test your code ahead of time, or at least refactor your code as you go, so it can be tested effectively. Lastly, within the frontend space. Reducing logic in templates and abstracting that out, will simplify testing your components.

You should also consider implementing a continuous integration (CI) and continuous delivery (CD) pipeline as you diversify your testing approach. CI/CD automates the process of running tests and deploying code changes. This helps catch issues early, maintains code quality, and ensures a smooth deployment process. Tools like Jenkins, Travis CI, or GitHub Actions can streamline this workflow, saving time and effort in the long run.

Asking the questions below will help suggest what type of test is before for the task: - Can this be tested with mock data, or is integrating with the backend necessary? - Is one type of test more complex than the other? - Which type of test is the most stable and consistent? - Where will the team get the quickest feedback? - Does this need to be tested with every commit, or is this a lower-priority test and could be run only on a full regression test suite? The above questions are not a comprehensive list, but they are a great start!

You should also consider incorporating test coverage analysis as a part of your automated testing strategy. Tools like Istanbul, Jest's coverage reports, or Angular CLI's built-in coverage tools can help you monitor how much of your code is covered by tests. This insight allows you to identify areas that might need additional testing attention, ensuring a higher level of code quality and risk mitigation.