    @Test
    public void backAndForth() {

        LocalizedFieldNames.Lookup lookup = localizedFieldNames.createLookup(Arrays.asList("dc.title"));
        final Locale english = new Locale("en");
        String title = lookup.toLocalizedName("dc_title", english);
        Assert.assertEquals("Title", title);
        String fieldName = lookup.toFieldName(title, english);
        Assert.assertEquals("dc_title", fieldName);
    }