}

    public void test_convertWithShi() {
        List<String> results = converter.convert("シ", null);
        assertTrue(results.contains("si"));
        assertTrue(results.contains("shi"));
    }

    public void test_convertWithChi() {
        List<String> results = converter.convert("チ", null);
        assertTrue(results.contains("ti"));
        assertTrue(results.contains("chi"));
    }

        map.put("ケ", new String[] { "ke" });
        map.put("コ", new String[] { "ko" });

        map.put("サ", new String[] { "sa" });
        map.put("シ", new String[] { "si", "shi" });
        map.put("ス", new String[] { "su" });
        map.put("セ", new String[] { "se" });
        map.put("ソ", new String[] { "so" });

        map.put("タ", new String[] { "ta" });

    assertThrows(IllegalArgumentException.class, () -> japaneseToSpanish.apply("Ni"));
    assertThat(japaneseToSpanish.apply("San")).isEqualTo("Tres");
    assertThrows(IllegalArgumentException.class, () -> japaneseToSpanish.apply("Shi"));

    new EqualsTester()
        .addEqualityGroup(japaneseToSpanish, Functions.compose(integerToSpanish, japaneseToInteger))
        .addEqualityGroup(japaneseToInteger)
        .addEqualityGroup(integerToSpanish)

    assertThrows(IllegalArgumentException.class, () -> japaneseToSpanish.apply("Ni"));
    assertThat(japaneseToSpanish.apply("San")).isEqualTo("Tres");
    assertThrows(IllegalArgumentException.class, () -> japaneseToSpanish.apply("Shi"));

    new EqualsTester()
        .addEqualityGroup(japaneseToSpanish, Functions.compose(integerToSpanish, japaneseToInteger))
        .addEqualityGroup(japaneseToInteger)
        .addEqualityGroup(integerToSpanish)

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