protected void setupDTMService(Program program) {
		AutoAnalysisManager analysisMgr = AutoAnalysisManager.getAnalysisManager(program);
		if (service != null) {
			setInstanceField("service", analysisMgr, service);
		}
		else {
			service = analysisMgr.getDataTypeManagerService();
			assertTrue("DefaultDataTypeManagerService".equals(service.getClass().getSimpleName()));
			Runtime.getRuntime().addShutdownHook(new ShutdownServiceHook());
		}
	}
Setup DTM service such that the same instance if used across all test methods.
This assumes that a tool is not used and that the DefaultDataTypeManagerService 
is used.
Ghidra/Features/MicrosoftCodeAnalyzer/src/test/java/ghidra/app/cmd/data/AbstractCreateDataTypeModelTest.java