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@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:

<dependency>
  <groupId>org.springframework.boot</groupId>
  <artifactId>spring-boot-autoconfigure</artifactId>
</dependency>

<dependency>
  <groupId>org.springframework</groupId>
  <artifactId>spring-web</artifactId>
</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

@SpringBootTest(classes = SimpleJsonTest.class)
@JsonTest
public class SimpleJsonTest extends AbstractTestNGSpringContextTests {

  @Autowired
  private JacksonTester<Foo> json;

  @Test
  public void testSerialize() throws Exception {
    Foo details = new Foo("Honda", 12);
    // 使用通包下的json文件测试结果是否正确
    assertThat(this.json.write(details)).isEqualToJson("expected.json");
    // 或者使用基于JSON path的校验
    assertThat(this.json.write(details)).hasJsonPathStringValue("@.name");
    assertThat(this.json.write(details)).extractingJsonPathStringValue("@.name").isEqualTo("Honda");
    assertThat(this.json.write(details)).hasJsonPathNumberValue("@.age");
    assertThat(this.json.write(details)).extractingJsonPathNumberValue("@.age").isEqualTo(12);
  }

  @Test
  public void testDeserialize() throws Exception {
    String content = "{\"name\":\"Ford\",\"age\":13}";
    Foo actual = this.json.parseObject(content);
    assertThat(actual).isEqualTo(new Foo("Ford", 13));
    assertThat(actual.getName()).isEqualTo("Ford");
    assertThat(actual.getAge()).isEqualTo(13);

  }

}

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

@JsonComponent
public class FooJsonComponent {

  public static class Serializer extends JsonSerializer<Foo> {
    @Override
    public void serialize(Foo value, JsonGenerator gen, SerializerProvider serializers)
        throws IOException, JsonProcessingException {
      // ...
    }

  }

  public static class Deserializer extends JsonDeserializer<Foo> {

    @Override
    public Foo deserialize(JsonParser p, DeserializationContext ctxt) throws IOException, JsonProcessingException {
      // ...
    }

  }

}

测试代码JsonComponentJsonTest

@SpringBootTest(classes = { JsonComponentJacksonTest.class, FooJsonComponent.class })
@JsonTest
public class JsonComponentJacksonTest extends AbstractTestNGSpringContextTests {

  @Autowired
  private JacksonTester<Foo> json;

  @Test
  public void testSerialize() throws Exception {
    Foo details = new Foo("Honda", 12);
    assertThat(this.json.write(details).getJson()).isEqualTo("\"name=Honda,age=12\"");
  }

  @Test
  public void testDeserialize() throws Exception {
    String content = "\"name=Ford,age=13\"";
    Foo actual = this.json.parseObject(content);
    assertThat(actual).isEqualTo(new Foo("Ford", 13));
    assertThat(actual.getName()).isEqualTo("Ford");
    assertThat(actual.getAge()).isEqualTo(13);

  }

}

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

@JsonTest
@ContextConfiguration(classes = JsonTest.class)
public class ThinJsonTest extends AbstractTestNGSpringContextTests {

  @Autowired
  private JacksonTester<Foo> json;

  @Test
  public void testSerialize() throws Exception {
    // ...
  }

  @Test
  public void testDeserialize() throws Exception {
    // ...
  }

}

参考文档


chanjarster
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