How do I test reducers in Redux?

How do I test reducers in Redux?

To test reducers, you can use a testing framework like Jest. You would create test cases that check the output of your reducer given specific inputs.

Can you show me an example of a test case for a reducer?

Sure! Here's a simple example:

import reducer from './yourReducer';

test('should return the initial state', () => {
  expect(reducer(undefined, {})).toEqual({});
});

// Add more tests for different actions

What should I include in my test cases?

Include tests for the initial state, handling of actions, and edge cases to ensure your reducer behaves as expected.

Are there any tools that can help with testing?

Yes, tools like Jest and Enzyme are popular for testing React applications, including Redux reducers.