DUnit examples:

TListTest      A Simple example of using DUnit to test Delphi's TList Class.
               Look at this first.

registration   Demonstrates different methods of registering test cases.

Collection     Demonstrates backward compatability with older versions of
               DUnit (prior to 3.2.3).

structure      A set of sample units demonstrating ways to organize your test 
               code.

registry       An example that demonstrates a simple refactoring and the 
               unit tests that catch a slippery error.

odbcdsn        This example demonstrates use of a mock object as well as 
               generating a series of tests at runtime to test all the
               logical combinations of a small but complex method.