@Override
			public void modifyLatest(MergeProgram mergeProgram) throws Exception {

				Library library =
					mergeProgram.createExternalLibrary(libname, SourceType.USER_DEFINED);
				mergeProgram.createNamespace(library, label, SourceType.USER_DEFINED);

				Program program = mergeProgram.getProgram();
				ExternalManager externalManager = program.getExternalManager();
				assertTrue(externalManager.contains(libname));
				assertNotNull(program.getSymbolTable().getNamespace(label, library));
			}
Test the merge of the versioned program's listing.
Ghidra/Features/Base/src/test.slow/java/ghidra/app/merge/listing/ExternalMergerAddTest.java