JsonComponentModuleTests.java

/*
 * Copyright 2012-2016 the original author or authors.
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *      http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */

package org.springframework.boot.jackson;

import com.fasterxml.jackson.databind.Module;
import com.fasterxml.jackson.databind.ObjectMapper;
import org.junit.Test;

import org.springframework.context.annotation.AnnotationConfigApplicationContext;

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

/**
 * Tests for {@link JsonComponentModule}.
 *
 * @author Phillip Webb
 */
public class JsonComponentModuleTests {

	@Test
	public void moduleShouldRegisterSerializers() throws Exception {
		AnnotationConfigApplicationContext context = new AnnotationConfigApplicationContext(
				JsonComponentModule.class, OnlySerializer.class);
		JsonComponentModule module = context.getBean(JsonComponentModule.class);
		assertSerialize(module);
		context.close();
	}

	@Test
	public void moduleShouldRegisterDeserializers() throws Exception {
		AnnotationConfigApplicationContext context = new AnnotationConfigApplicationContext(
				JsonComponentModule.class, OnlyDeserializer.class);
		JsonComponentModule module = context.getBean(JsonComponentModule.class);
		assertDeserialize(module);
		context.close();
	}

	@Test
	public void moduleShouldRegisterInnerClasses() throws Exception {
		AnnotationConfigApplicationContext context = new AnnotationConfigApplicationContext(
				JsonComponentModule.class, NameAndAgeJsonComponent.class);
		JsonComponentModule module = context.getBean(JsonComponentModule.class);
		assertSerialize(module);
		assertDeserialize(module);
		context.close();
	}

	private void assertSerialize(Module module) throws Exception {
		ObjectMapper mapper = new ObjectMapper();
		mapper.registerModule(module);
		String json = mapper.writeValueAsString(new NameAndAge("spring", 100));
		assertThat(json).isEqualToIgnoringWhitespace("{\"name\":\"spring\",\"age\":100}");
	}

	private void assertDeserialize(Module module) throws Exception {
		ObjectMapper mapper = new ObjectMapper();
		mapper.registerModule(module);
		NameAndAge nameAndAge = mapper.readValue("{\"name\":\"spring\",\"age\":100}",
				NameAndAge.class);
		assertThat(nameAndAge.getName()).isEqualTo("spring");
		assertThat(nameAndAge.getAge()).isEqualTo(100);
	}

	@JsonComponent
	static class OnlySerializer extends NameAndAgeJsonComponent.Serializer {

	}

	@JsonComponent
	static class OnlyDeserializer extends NameAndAgeJsonComponent.Deserializer {

	}

}