someOtherDto2.setOtherField3("value2");
SomeDTO src = newInstance(SomeDTO.class);
src.setField2(new SomeOtherDTO[] { someOtherDto2, someOtherDto });
SomeVO dest = mapper.map(src, SomeVO.class);
assertEquals("incorrect resulting set size", src.getField2().length, dest.getField2().size());
// TODO: add more asserts
}