Test-driving a saga

A saga is a special bit of code that uses JavaScript generator functions to manage asynchronous operations to the Redux store. Because it’s super complex, we won’t actually test the saga itself; instead, we’ll dispatch an action to the store and observe the results.

Before we get started on the saga tests, we need a new test helper function named renderWithStore.

Adding the renderWithStore test extension

Proceed as follows:

1. At the top of test/reactTestExtensions.js, add the following new import statements:

   import { Provider } from "react-redux";
   import { storeSpy } from "expect-redux";
   import { configureStore } from "../src/store";

The expect-redux package

For that, we’ll use the expect-redux package from NPM, which has already been included in the package.json file for you—make sure to run npm install before you begin.

2. Add a new variable, store, and initialize it...