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</sarcasm>TDD's purpose is to help you, not to beat you over the head with regulations :) When @Ikke says interface, BTW, they mean public interface (class methods/properties), not a C# or Javainterface.dynamickeyword and a factory function to return your class under test. This allows you to compile and run your test suite, even though methods or whole classes might be missing, and treat binding errors as runtime errors instead of compile time. This lets you write all the tests first, even before writing a single piece of code. There is a minor abstraction cost in your tests, so it is subject to taste.