For a unit test to operate on a truly isolated unit of the application, we need to mock every module except the one we are testing. Jest makes the mocking of other parts of a Flux application trivial.
Via Ofir Shalev
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JavaScript for Line of Business Applications
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Keeping track of current JavaScript Frameworks that help design your clientside Business Logic Layers.
Curated by
Jan Hesse
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Scoop.it!
When developing front-end applications, my TDD tool belt consists of karma, mocha, sinon, and chai. When I first learned of Jest, I was skeptical of the new JavaScript unit testing framework and was not convinced I should make the switch. After a bit of research and a sample project on Github, I will tell you why I have made the decision to switch and why you should, too. ... 
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