Unit testing Rails applications' controller's helper Module - How?

Programmer Question

In my rails application there exists a controller helper which is a Module (not a Class) with lot of helper methods defined in it. I wish to write unit test cases for this before I do code refactoring of this module so as to ensure that my understanding of the current system is right and that I have not broken any functionality inadvertantly. We are using RSpec and I would wish to know how would one go about writing unit test cases for the methods of this helper Module?

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