Testable State Management: Effects

Episode #83 • Dec 2, 2019 • Subscriber-Only

Side effects are by far the hardest thing to test in an application. They speak to the outside world and they tend to be sprinkled around to get the job done. However, we can get broad test coverage of our reducer’s effects with very little work, and it will all be thanks to a simple technique we covered in the past.

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Testable State Management: Effects
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Introduction

This is basically an integration test for reducers. We are testing multiple layers of features, understanding how they interact with each other, and making assertions that they play nicely together. This is pretty huge! Again this is only a toy app, but in a large application you would be able to test that lots of tiny, reusable components continue working properly when they are plugged together. This is already powerful, and we haven’t even discussed effects yet.

Testing effects


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