Sinon.JS is a library that provides us with a set of APIs that can help us to test a component in isolation, thanks to its usage of spies, stubs, and mocks. Testing software components can be very difficult when there is a high level of coupling between them. However, a library such as Sinon.JS can help us isolate the components to test their features. We can install Sinon.JS using the following command:
npm install --save-dev sinon @types/sinon
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