Testing asynchronous JavaScript

By making AJAX calls directly to the server from your JavaScript view-model it can be impossible to get the code under test. A simple solution is to fake the calls and make them synchronous.
This example view-model for a library takes a function that will make a call to the server to check out a book for a user.

When the page loads, the view-model will be set up with the actual jQuery function like so:


 

In the tests, the jQuery call can be faked out with one that returns a canned response:

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