Unit-testing Redux

We have already fiddled with the Jest testing framework in Chapter 4, Chat System with Electron and React: Enhancement, Testing, and Delivery (Writing Unit-tests section). Redux introduces new concepts, such as actions and reducers. Now, we are going to unit-test them.

As you may remember, to run Jest, we need to configure Babel:

.babelrc

{ 
  "presets": [ 
     ["env", { 
      "targets": { "node": 7 }, 
      "useBuiltIns": true 
    }], 
    "react", 
    "stage-3" 
  ], 
  
  "plugins": [ 
    "transform-class-properties", 
    "transform-decorators-legacy" 
  ] 
} 

Again, with env preset, we target Babel on Node.js 7 and enable the extra plugins we used in the webpack configuration.

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