private DockingActionIf getAddAction() {
		return getAction(plugin, "Add Enum Value");
	}
{@link AbstractEnumEditorUndoRedoTest} contains tests which should be applied to the various 
{@link DataTypeManager} implementations which are responsible for setting {@code dtm} during
the setUp phase.
Ghidra/Features/Base/src/test.slow/java/ghidra/app/plugin/core/datamgr/editor/AbstractEnumEditorUndoRedoTest.java