DUnit examples:

cmdline 	Examples of how to invoke DUnit from the command line
collection 	A Java-like collections implementation and its DUnit test cases
embeddable 	Shows how to embed the GUITestRunner in another tool's forms.
registration 	Using the test case registration system
registry 	A step by step example of building a registry utility, with test cases
structure 	Alternative ways to organize tests
testexception   Shows two ways to test for expected exceptions
TListTest 	Test cases for the Delphi Classes.TList object                