I have a custom Jackson config like below:

@Configuration
public class JacksonConfig {
  @Bean
  public Jackson2ObjectMapperBuilderCustomizer jsonCustomizer() {
    return builder -> builder.serializationInclusion(JsonInclude.Include.NON_NULL)
        .serializerByType(ZonedDateTime.class,
            new ZonedDateTimeSerializer(DateTransformer.ISO_TIMESTAMP_FORMATTER))
        .serializerByType(LocalDateTime.class,
            new LocalDateTimeSerializer(DateTransformer.ISO_TIMESTAMP_FORMATTER))
        .deserializerByType(LocalDateTime.class,
            new LocalDateTimeDeserializer(DateTransformer.ISO_TIMESTAMP_FORMATTER));
//        .indentOutput(true);
  }
}

but when slice testing with @JsonTest, This JacksonConfig is not working(not use my LocalDateTimeDeserializer). But on the Springboot entry class, It shows that JacksonConfig was loaded successfully, and it truely does(when I boot the application, JacksonConfig is working) SpringBoot @JsonTest not load custom Jackson2ObjectMapperBuilderCustomizer beans as expected

But if I manually import this JacksonConfig on my test class, it works again(all tests passed):

@JsonTest
// import manually
@Import(JacksonConfig.class)
public class JsonConfigTest {

  @Autowired
  private JacksonTester<LocalDate> localDateJacksonTester;


  @Autowired
  private JacksonTester<LocalDateTime> localDateTimeJacksonTester;

  @Test
  void shouldSerializeLocalDate() throws IOException {
    final LocalDate now = LocalDate.now();
    final JsonContent<LocalDate> write = localDateJacksonTester.write(now);
    assertThatNoException().isThrownBy(() -> new DateTransformer(write.getJson().replace("\"", "")));
  }

  @Test
  void shouldSerializeLocalDateTime() throws IOException {
    final JsonContent<LocalDateTime> write = localDateTimeJacksonTester.write(LocalDateTime.now());
    assertThatNoException().isThrownBy(() -> new DateTransformer(write.getJson().replace("\"", "")));
  }

}

So I was wondering, is there any chance that @JsonTest can auto load my JacksonConfig ?

Comment From: wilkinsona

No, that's not possible automatically as sliced tests are based on component scanning and your jsonCustomizer bean isn't a component. Please see the following sections of the reference documentation: