ArgumentConvertor implements IArgumentConvertor { ObjectMapper getObjectMapper() { return objectMapper; }  @Override Object convertJsonToJava(String jsonArg, Type paramType, Annotation[] parameterAnnotations);  }
@Test public void testGetObjectMapper() { System.out.println("getObjectMapper"); doCallRealMethod().when(instance).getObjectMapper(); ObjectMapper result = instance.getObjectMapper(); assertThat(result).isInstanceOf(ObjectMapper.class); }