private static void initProgramCommon(Program program) throws Exception {
		Listing listing = program.getListing();

		Address a = addr(program, "OtherOverlay:0x01001680");
		listing.createFunction("oFunc", a, new AddressSet(a, a), SourceType.USER_DEFINED);

		a = addr(program, "SomeOverlay:0x01001780");
		listing.createFunction("sFunc", a, new AddressSet(a, a), SourceType.USER_DEFINED);

	}
<CODE>ProgramDiffTest</CODE> tests the <CODE>ProgramDiff</CODE> class
to verify it correctly determines various types of program differences.
The setup for this test class loads two programs that were saved to the
testdata directory as XML. The tests will determine the differences between
these two programs.
Ghidra/Features/Base/src/test.slow/java/ghidra/program/util/ProgramDiffMergeOverlayTest.java