@Override
			public void modifyLatest(ProgramDB program) {
				PropertyMapManager pmm = program.getUsrPropertyManager();
				try {
					StringPropertyMap spm = pmm.createStringPropertyMap("testString4");
					spm.add(addr(program, "0x1002500"), "I");
					spm.add(addr(program, "0x1002566"), "J");

					pmm.removePropertyMap("testString1");

				}
				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