How do I test Redux Observable?

How do I test Redux Observable?

To test Redux Observable, you can use libraries like Jest and RxJS. Start by creating a test for your epic.

Can you show me an example of a test for an epic?

Sure! Here's a simple example:

import { TestScheduler } from 'rxjs/testing';
import { myEpic } from './epics';

const testScheduler = new TestScheduler((actual, expected) => {
  expect(actual).toEqual(expected);
});

testScheduler.run(({ hot, cold, expectObservable }) => {
  const action$ = hot('a---b---c', { a: { type: 'ACTION_A' }, b: { type: 'ACTION_B' }, c: { type: 'ACTION_C' }});
  const expectedMarble = '---x---y';
  const expectedValues = { x: { type: 'RESULT_X' }, y: { type: 'RESULT_Y' }};

  expectObservable(myEpic(action$)).toBe(expectedMarble, expectedValues);
});

What if I want to test an epic that involves API calls?

You can mock the API calls using libraries like jest.mock or nock. This allows you to simulate responses without hitting the actual API.

Are there any best practices for testing Redux Observable?

Yes! Some best practices include keeping your tests isolated, using descriptive names, and testing both success and error cases.