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Here's a good start to understanding spies and mocks in the Jasmine testing framework: http://www.htmlgoodies.com/html5/javascript/spy-on-javascript-methods-using-the-jasmine-testing-framework.html#fbid=KDwaUP8vqhV
note: this is in a previous version of jasmine, but provides a good comprehensive outlook on what spies and mocks do.
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