@Test
    public void testUnmodifiableList() throws Exception
    {
        UnmodifiableInt32List list = UnmodifiableInt32List.getSchema().newMessage();
        list.mergeFrom(createInput(42), list);
        exception.expect(UnsupportedOperationException.class);
        list.mergeFrom(createInput(43), list);
    }
Test that generated #mergeFrom method can be used multiple times

@throws Exception
protostuff-it/src/test/java/io/protostuff/compiler/java_bean/RepeatedIT.java