Hi developers,
React developers love crafting components, but when it comes to code coverage, they often find themselves at a loss. This blog aims to change that! By the end, you’ll feel confident in writing test cases that minimize bugs.
I’ve shared some key points and techniques below to help you write React components that are easy to test.
- Before writing any component, ask yourself: Is it testable? If the answer is no, it’s time to change your approach.
Solution: Embrace the TDD (Test-Driven Development) approach.
- When mocking, follow the principle of abstraction by defining the implementation.
Instead of passing state and handlers as props, and to avoid mocking API calls, define the implementation by passing methods as props. This allows you to create mock responses effectively.
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Notes -
To improve your tests, ensure they are readable and well-structured. Here are some key points:
Separate Rendered and Event-Based Tests: Write tests for rendering and events separately to maintain clarity.
Use Mock Data Helper Functions: Create helper functions for mock data to keep your tests clean and reusable.
Name Tests Clearly: Follow the “Should be” convention for test case names to make their purpose clear.
Use act with await: For interactive tests, such as setting a text box value or clicking a button, use act with await to handle asynchronous updates.
Isolate Components: Ensure each component is isolated from others to avoid dependencies and side effects.
Focus on Integration Testing: Prioritize integration tests that cover interactions between all the tiny components to ensure comprehensive coverage.
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