String result = normalizer.normalize("ａ　ｂ", "field");

        assertEquals("a　b", result);
    }

    @Test
    public void test_withLanguages() throws Exception {
        FullWidthToHalfWidthAlphabetNormalizer normalizer = new FullWidthToHalfWidthAlphabetNormalizer();

        String result = normalizer.normalize("ａｂｃ", "field", "en", "ja");