@Test
	public void testDeleteFunctionsForDestinationProgram() {

		assertEquals(List.of(a1, a2, a3), model.getFunctions(LEFT));
		assertEquals(List.of(b1), model.getFunctions(RIGHT));
		assertEquals(a3, model.getActiveFunction(LEFT));
		assertEquals(b1, model.getActiveFunction(RIGHT));

		// this will delete everything because all the sources have no targets
		model.removeFunctions(program2);

		assertEquals(List.of(), model.getFunctions(LEFT));
		assertEquals(List.of(), model.getFunctions(RIGHT));
		assertNull(model.getActiveFunction(LEFT));
		assertNull(model.getActiveFunction(RIGHT));
	}
Tests the comparison API for using default function comparison model. Each test verifies that
the underlying data model looks correct following a particular API method 
call. There are a few tests that also exercise various features of the data
model directly.
<li>The API methods being tested: {@link FunctionComparisonService}</li>
<li>The model being used for verification: {@link AnyToAnyFunctionComparisonModel}</li>
Ghidra/Features/Base/src/test/java/ghidra/features/base/codecompare/model/MatchedFunctionComparisonModelTest.java