public static ObjectMapper ofJson() {
        return MAPPER;
    }
@Test
    @DefaultTimeZone("Europe/Athens")
    void json() throws IOException {
        ObjectMapper mapper = JacksonMapper
            .ofJson()
            .copy()
            .setTimeZone(TimeZone.getDefault());

        Pojo original = pojo();

        String s = mapper.writeValueAsString(original);
        Pojo deserialize = mapper.readValue(s, Pojo.class);

        test(original, deserialize);
    }