BANGALORE, INDIA: There is a debate in the Test Driven Development (TDD) community about whether or not it's appropriate to test private methods with unit test tools like NUnit. By default NUnit will not allow you to test private methods. But you can test private methods using .NET's Reflection API.

To call a class' private method, instantiate a Type object for the class. Then call the Type object's GetMethod method, specifying BindingFlags.Private. You'll also need to specify BindingFlags.Static if the method is static.

Once you've called GetMethod, you'll have a MethodInfo object for the method. Finally, call the MethodInfo object's Invoke method to call the private method.

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