assertTrue(merged.getRoles().length >= 2);
        assertTrue(merged.getLanguages().length >= 2);
        assertEquals(2, merged.getKinds().length);
    }

    @Test
    public void testToJsonString() {
        // Test toJsonString method
        String[] text = { "json", "test" };
        String[][] readings = { { "json" }, { "test" } };
        String[] tags = { "tag1" };