assertNotNull(map.get(FieldNames.LANGUAGES));
        assertNotNull(map.get(FieldNames.KINDS));
        assertNotNull(map.get(FieldNames.TIMESTAMP));
    }

    @Test
    public void testGetSource() {
        // Test getSource method
        String[] text = { "source", "test" };
        String[][] readings = { { "source" }, { "test" } };
        String[] fields = { "field1" };