public void testUndoRedo() throws Exception {
		populateModel(3);
		assertEquals(5, manager.getObjectCount());

		b.trace.undo();
		assertEquals(0, manager.getObjectCount());

		b.trace.redo();
		assertEquals(5, manager.getObjectCount());
	}
Fails because you cannot create a second root object.
Ghidra/Debug/Framework-TraceModeling/src/test/java/ghidra/trace/database/target/DBTraceObjectManagerTest.java