void assertAlignmentTypeApplied() {
			assertTrue(isValid);

			Address fillerAddress = getFillerStart();
			Listing listing = program.getListing();
			Data data = listing.getDataAt(fillerAddress);

			DataType dt = data.getDataType();
			assertTrue("Filler bytes not collapsed at function " + function,
				dt instanceof AlignmentDataType);
			assertEquals(fillerByteCount, data.getLength());
		}
Asserts filler bytes are collapsed if the function represented by this class
had filler bytes to be collapsed.   Otherwise, assert that filler bytes were
not applied.
Ghidra/Features/Base/src/test/java/ghidra/app/analyzers/CondenseFillerBytesAnalyzerTest.java