assertTrue(results.contains("dhi"));
    }

    public void test_convertModernKatakana_Dyu() {
        List<String> results = converter.convert("デュ", null);
        assertTrue(results.contains("dyu"));
    }

    public void test_convertModernKatakana_Tsa() {
        List<String> results = converter.convert("ツァ", null);
        assertTrue(results.contains("tsa"));
    }