public void test_convertWithJi() {
        List<String> results = converter.convert("ジ", null);
        assertTrue(results.contains("zi"));
        assertTrue(results.contains("ji"));
    }

    public void test_convertCombinedKatakana() {
        List<String> results = converter.convert("キャ", null);
        assertTrue(results.contains("kya"));
    }

    public void test_convertSha() {