Check out a free preview of the full Unit Testing JavaScript (with CoffeeScript) course:
The "Video 5: Presenting a Problem" 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:

Justin and Dave create a unit test to verify a problem is presented to the user correctly. The production code combines the left and right operands with the operator to create a well-formed problem.

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