What are the best practices for hook testing in React?

What are the best practices for hook testing in React?

When testing hooks in React, it's important to isolate them and test their behavior in different scenarios. Use libraries like React Testing Library or Enzyme.

Can you give me an example of how to test a custom hook?

Sure! You can create a test file for your custom hook and use the renderHook function from React Testing Library to test it. For example:

import { renderHook } from '@testing-library/react-hooks';
import useCustomHook from './useCustomHook';

test('should return expected value', () => {
  const { result } = renderHook(() => useCustomHook());
  expect(result.current).toBe(expectedValue);
});

What should I consider when testing hooks that use context?

When testing hooks that rely on context, you should wrap your hook in a context provider during the test. This ensures that the hook has access to the context values it needs.

Are there any common pitfalls to avoid when testing hooks?

Yes, some common pitfalls include not cleaning up after tests, not testing all possible states of the hook, and failing to mock dependencies properly.