Chapter 2: Annotations - @JsonTest

@JsonTest是Spring Boot提供的方便测试JSON序列化反序列化的测试工具,在Spring Boot的文档中有一些介绍。

需要注意的是@JsonTest需要Jackson的ObjectMapper,事实上如果你的Spring Boot项目添加了spring-web的Maven依赖,JacksonAutoConfiguration就会自动为你配置一个:

  1. <dependency>
  2. <groupId>org.springframework.boot</groupId>
  3. <artifactId>spring-boot-autoconfigure</artifactId>
  4. </dependency>
  5. <dependency>
  6. <groupId>org.springframework</groupId>
  7. <artifactId>spring-web</artifactId>
  8. </dependency>

这里没有提供关于日期时间的例子,关于这个比较复杂,可以看我的另一篇文章:Spring Boot Jackson对于日期时间类型处理的例子

例子1:简单例子

源代码见SimpleJsonTest

  1. @SpringBootTest(classes = SimpleJsonTest.class)
  2. @JsonTest
  3. public class SimpleJsonTest extends AbstractTestNGSpringContextTests {
  4. @Autowired
  5. private JacksonTester<Foo> json;
  6. @Test
  7. public void testSerialize() throws Exception {
  8. Foo details = new Foo("Honda", 12);
  9. // 使用通包下的json文件测试结果是否正确
  10. assertThat(this.json.write(details)).isEqualToJson("expected.json");
  11. // 或者使用基于JSON path的校验
  12. assertThat(this.json.write(details)).hasJsonPathStringValue("@.name");
  13. assertThat(this.json.write(details)).extractingJsonPathStringValue("@.name").isEqualTo("Honda");
  14. assertThat(this.json.write(details)).hasJsonPathNumberValue("@.age");
  15. assertThat(this.json.write(details)).extractingJsonPathNumberValue("@.age").isEqualTo(12);
  16. }
  17. @Test
  18. public void testDeserialize() throws Exception {
  19. String content = "{\"name\":\"Ford\",\"age\":13}";
  20. Foo actual = this.json.parseObject(content);
  21. assertThat(actual).isEqualTo(new Foo("Ford", 13));
  22. assertThat(actual.getName()).isEqualTo("Ford");
  23. assertThat(actual.getAge()).isEqualTo(13);
  24. }
  25. }

例子2: 测试@JsonComponent

@JsonTest可以用来测试@JsonComponent

这个例子里使用了自定义的@JsonComponent FooJsonComponent

  1. @JsonComponent
  2. public class FooJsonComponent {
  3. public static class Serializer extends JsonSerializer<Foo> {
  4. @Override
  5. public void serialize(Foo value, JsonGenerator gen, SerializerProvider serializers)
  6. throws IOException, JsonProcessingException {
  7. // ...
  8. }
  9. }
  10. public static class Deserializer extends JsonDeserializer<Foo> {
  11. @Override
  12. public Foo deserialize(JsonParser p, DeserializationContext ctxt) throws IOException, JsonProcessingException {
  13. // ...
  14. }
  15. }
  16. }

测试代码JsonComponentJsonTest

  1. @SpringBootTest(classes = { JsonComponentJacksonTest.class, FooJsonComponent.class })
  2. @JsonTest
  3. public class JsonComponentJacksonTest extends AbstractTestNGSpringContextTests {
  4. @Autowired
  5. private JacksonTester<Foo> json;
  6. @Test
  7. public void testSerialize() throws Exception {
  8. Foo details = new Foo("Honda", 12);
  9. assertThat(this.json.write(details).getJson()).isEqualTo("\"name=Honda,age=12\"");
  10. }
  11. @Test
  12. public void testDeserialize() throws Exception {
  13. String content = "\"name=Ford,age=13\"";
  14. Foo actual = this.json.parseObject(content);
  15. assertThat(actual).isEqualTo(new Foo("Ford", 13));
  16. assertThat(actual.getName()).isEqualTo("Ford");
  17. assertThat(actual.getAge()).isEqualTo(13);
  18. }
  19. }

例子3: 使用@ContextConfiguration

事实上@JsonTest也可以配合@ContextConfiguration一起使用。

源代码见ThinJsonTest

  1. @JsonTest
  2. @ContextConfiguration(classes = JsonTest.class)
  3. public class ThinJsonTest extends AbstractTestNGSpringContextTests {
  4. @Autowired
  5. private JacksonTester<Foo> json;
  6. @Test
  7. public void testSerialize() throws Exception {
  8. // ...
  9. }
  10. @Test
  11. public void testDeserialize() throws Exception {
  12. // ...
  13. }
  14. }

参考文档