@Test
	public void testBlankFormatLineDifferences() throws Exception {
		// 0x100248c: p2 has format line indicating function exit.
		// 0x1002428: p1 and p2 both have a format line.
		programBuilder1.setIntProperty("0x1002428", "Space", 1);

		programBuilder2.setIntProperty("0x100248c", "Space", 1);
		programBuilder2.setIntProperty("0x1002428", "Space", 1);

		programDiff = new ProgramDiff(p1, p2);
		AddressSet as = new AddressSet(addr(0x100248c), addr(0x100248e));
		programDiff.setFilter(new ProgramDiffFilter(ProgramDiffFilter.USER_DEFINED_DIFFS));
		assertEquals(as, programDiff.getDifferences(programDiff.getFilter(), null));
	}
Test that ProgramDiff can determine the blank format line user defined property
differences between Program1 and Program2.
Ghidra/Features/Base/src/test.slow/java/ghidra/program/util/ProgramDiff4Test.java