private static ObjectMapper defaultMapper() {
  final ObjectMapper objectMapper = JsonMapper.builder()
      .serializationInclusion(JsonInclude.Include.NON_EMPTY)
      .configure(DeserializationFeature.FAIL_ON_UNKNOWN_PROPERTIES, false)
      .configure(JsonWriteFeature.WRITE_NUMBERS_AS_STRINGS, false)
      .build()
      .registerModule(new Jdk8Module())
      .registerModule(new InterledgerModule(Encoding.BASE64));
  objectMapper.configure(SerializationFeature.WRITE_DATES_AS_TIMESTAMPS, false);
  objectMapper.configure(JsonGenerator.Feature.WRITE_BIGDECIMAL_AS_PLAIN, true);
  return objectMapper;
}
 

@ParameterizedTest
@MethodSource("amounts")
void shouldWriteNumbersAsStrings(final MonetaryAmount amount) throws JsonProcessingException {
    final ObjectMapper unit = build()
            .enable(JsonWriteFeature.WRITE_NUMBERS_AS_STRINGS)
            .build();

    final String expected = "{\"amount\":\"29.95\",\"currency\":\"EUR\"}";
    final String actual = unit.writeValueAsString(amount);

    assertThat(actual, is(expected));
}
 

@ParameterizedTest
@MethodSource("hundreds")
void shouldWriteNumbersAsPlainStrings(final MonetaryAmount hundred) throws JsonProcessingException {
    final ObjectMapper unit = build()
            .enable(JsonWriteFeature.WRITE_NUMBERS_AS_STRINGS)
            .enable(JsonGenerator.Feature.WRITE_BIGDECIMAL_AS_PLAIN)
            .build();

    final String expected = "{\"amount\":\"100.00\",\"currency\":\"EUR\"}";
    final String actual = unit.writeValueAsString(hundred);

    assertThat(actual, is(expected));
}