@Override
			public void modifyPrivate(ProgramDB program) {
				PropertyMapManager pmm = program.getUsrPropertyManager();
				try {
					VoidPropertyMap vpm = pmm.createVoidPropertyMap("testVoidProp");
					vpm.add(addr(program, "0x1002481"));
					vpm.add(addr(program, "0x100248c"));
				}
				catch (DuplicateNameException e) {
					e.printStackTrace();
				}
			}
Test the merge of the versioned program's listing.
Ghidra/Features/Base/src/test.slow/java/ghidra/app/merge/listing/UserDefinedPropertyMergeManagerTest.java