code: @Test public void disableMapperFeature() throws Exception {
    this.context.register(JacksonAutoConfiguration.class);
    EnvironmentTestUtils.addEnvironment(this.context,"spring.jackson.mapper.use_annotations:false");
    this.context.refresh();
    ObjectMapper mapper=this.context.getBean(ObjectMapper.class);
    assertTrue(MapperFeature.USE_ANNOTATIONS.enabledByDefault());
    assertFalse(mapper.getDeserializationConfig().hasMapperFeatures(MapperFeature.USE_ANNOTATIONS.getMask()));
    assertFalse(mapper.getSerializationConfig().hasMapperFeatures(MapperFeature.USE_ANNOTATIONS.getMask()));
  }
  