@Test
  public void shouldCallServiceWithDefaultValueIfNotSendingMandatoryParameter() {
    // Given
    Mapping mapping =
        new MappingBuilder(OPERATION_FIELD_NAME)
            .mapField("s1", FieldMapping.mapWithDefault("s1", "default value"))
            .build();
    MappedApi service = service(mapping);

    // When
    service.mappedCall(null, 1L);
    receive(captureMessage(), mapping);

    // Then
    verify(serviceMock).mappedCall("default value", 1L);
  }