This course has been updated! We now recommend you take the JavaScript Testing Practices and Principles course.

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The "Refactoring Application Code" Lesson is part of the full, Unit Testing JavaScript (with CoffeeScript) course featured in this preview video. Here's what you'd learn in this lesson:

Dave finishes the Roman Calculator example by refactoring the application code. He demonstrates how a growing number of test cases can pinpoint areas in the applicant code that need optimization. Because the test are already written, he can monitory them during the optimization process to ensure the code is still functional.

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