title: parametrized tests with Mocha
body: <p>How can I create parametrized tests with Mocha?</p>
  
  <p>Sample use case: I have 10 classes, that are 10 different implementations of the same interface. I want to run the exact same suit of tests for each class. I can create a function, that takes the class as a parameter and runs all tests with that class, but then I will have all tests in a single function - I won't be able to separate them nicely to different "describe" clauses...</p>
  
  <p>Is there a natural way to do this in Mocha?</p>