Jackson Plain Test

import static org.assertj.core.api.Assertions.assertThat;

import lombok.Data;

import java.util.List;

import org.junit.jupiter.api.Test;

import com.fasterxml.jackson.annotation.JsonTypeInfo;
import com.fasterxml.jackson.core.JsonProcessingException;
import com.fasterxml.jackson.databind.ObjectMapper;

public class JacksonPlainTest {

    @Test
    void testPlain() throws JsonProcessingException {
        ObjectMapper m = new ObjectMapper();
        m.findAndRegisterModules();

        Dog dog = new Dog();
        dog.setName("dog");

        Cat cat = new Cat();
        cat.setName("cat");

        List<Animal> animals = List.of(dog, cat);
        Zoo z = new Zoo();
        z.setAnimals(animals);

        String json = m.writeValueAsString(z);
        Zoo deser = m.readValue(json, Zoo.class);
        assertThat(z).isEqualTo(deser);
    }

    @Data
    static class Zoo {
        @JsonTypeInfo(use = JsonTypeInfo.Id.CLASS)
        List<Animal> animals;
    }

    interface Animal {
        String getName();
    }

    @Data
    static class Dog implements Animal {
        String name;
    }

    @Data
    static class Cat implements Animal {
        String name;
    }
}