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The Ultimate Guide to Redux

Testing Async Middleware

Explore how to test asynchronous middleware in Redux that processes API requests, manages loading states, and handles success and error responses. Understand dispatch patterns to maintain accurate state during server communication and improve app reliability.

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For a more complete example, let’s use the following API middleware:

import axios from 'axios';
import { API } from 'consts';
import { apiStarted, apiFinished, apiError } from 'actions/ui';

const apiMiddleware = ({ dispatch, getState }) => next => action => {
  if (action.type !== API) {
    return next(action);
  }

  const { url, success } = action.payload;
  const headers = {};
  const accessToken =
...