@Override
	public ProgramModule getDefaultRootModule() {
		throw new UnsupportedOperationException();
	}
ListingStub can be extended for use by tests. It throws an UnsupportedOperationException
for all methods in the Listing interface. Any method that is needed for your test can then
be overridden so it can provide its own test implementation and return value.
Ghidra/Framework/SoftwareModeling/src/main/java/ghidra/program/model/listing/StubListing.java