assertNotNull(merged);
        assertEquals(30L, merged.getQueryFreq());
        assertEquals(15L, merged.getDocFreq());
    }

    @Test
    public void test_merge_withOverlappingValues() {
        String[] text1 = { "test" };
        String[][] readings1 = { { "test" } };
        String[] tags1 = { "tag1", "tag2" };
        String[] roles1 = { "role1" };