DUnit: How to run tests?

Adding a TestCase to the main project is not the way to go. You should create a separate TestProject (you can have it in the same ProjectGroup as the main project), add a TestCase and run.

I agree with Uwe Raabe, but sometimes it can be useful to have a 'hidden' link within your app to run the DUnit GUI. I use:

TGUITestRunner.runRegisteredTests;

Call this from your button at the DUnit GUI will open for you to manually run and view test output.

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For example, if you hold down a special key combination when opening the software's own "Control Panel", you get some advanced entries: