An advanced guide to Vitest testing and mocking
Table of Contents
- Introduction to Vitest Testing and Mocking
- Setting Up a Test Workflow
- Testing a Service Function Performing a Network Call
- Testing the Correct Rendering of a Vue Component
- Improving Testability
Introduction to Vitest Testing and Mocking
Vitest testing and mocking involve using different techniques such as fakes, stubs, spies, and mocks to test software applications effectively. These techniques help in creating predictable testing scenarios and verifying expected behavior in various parts of the code.
Setting Up a Test Workflow
Establishing a good test workflow is essential for efficient testing. This includes utilizing tools like the Vitest CLI, Test Explorer view, and code coverage analysis to run tests, debug, and visualize coverage results. Running tests automatically on file save and using interactive CLI features can enhance the testing process.
Testing a Service Function Performing a Network Call
In this section, we explore testing a service function that makes a network call. By using spies and mocks, we can simulate the network call response without actually making the call. This helps in isolating the test scenario and verifying the behavior of the function accurately.
Testing the Correct Rendering of a Vue Component
Verifying the correct rendering of a Vue component involves white box testing techniques. By creating mock stores and handling asynchronous actions in tests, we can ensure that the component renders as expected. Proper separation of concerns and waiting for DOM updates are crucial for accurate component testing.
Improving Testability
To improve the testability of components and functions, refactoring code to enhance separation of concerns is necessary. By decoupling dependencies and creating mock implementations for external functions, testing becomes more manageable and reliable. Utilizing testing phases like arrange, act, and assert helps in structuring tests effectively.