@Test public void testProcess() throws Exception { Foo foo; while ((foo = fooService.generateFoo()) != null) { processor.write(Collections.singletonList(foo)); } List<Foo> input = fooService.getGeneratedFoos(); List<Foo> processed = fooService.getProcessedFooNameValuePairs(); assertEquals(input.size(), processed.size()); assertFalse(fooService.getProcessedFooNameValuePairs().isEmpty()); for (int i = 0; i < input.size(); i++) { Foo inputFoo = input.get(i); Foo outputFoo = processed.get(i); assertEquals(inputFoo.getName(), outputFoo.getName()); assertEquals(inputFoo.getValue(), outputFoo.getValue()); assertEquals(0, outputFoo.getId()); } }