## Display Device Driver Reference for OS/2

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### Test Group Selection

There is a 1:1 relationship between test groups and test-case DLLs. Each test group represents a specific DLL. Before a test case can be selected, the test group containing the test case must be selected from the Test Groups section of the DTT Test Case Selection dialog panel. When you select a test group, the list of test cases it contains is added to the Test Cases section of the dialog panel. Deselecting a test group removes the list of test cases it contains from the Test Cases section.

Note: Test groups must be specifically deselected. DTT never automatically deselects a test group.