private void checkNoCommentDifference() throws Exception {
		programDiff = new ProgramDiff(p1, p2);
		programDiff.setFilter(new ProgramDiffFilter(ProgramDiffFilter.COMMENT_DIFFS));
		AddressSet as = new AddressSet();
		AddressSetView diffAs = programDiff.getDifferences(programDiff.getFilter(), null);
		assertEquals(as, diffAs);
	}
Test that ProgramDiff can determine the code unit differences between
Program1 and Program2 where Data Settings differ.
Ghidra/Features/Base/src/test.slow/java/ghidra/program/util/ProgramDiff1Test.java