#379 - Added test case that shows AbstractJackson2HttpMessageConverter drop information on rendering on Spring 4.2 and Jackson 2.6.

Related tickets: spring-projects/spring-boot#3731, SPR-13318.

src/test/java/org/springframework/hateoas/Jackson2PagedResourcesIntegrationTest.java

@@ -0,0 +1,93 @@
+/*
+ * Copyright 2015 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.hateoas;
+
+import static org.hamcrest.CoreMatchers.*;
+import static org.junit.Assert.*;
+import static org.mockito.Mockito.*;
+
+import java.io.StringWriter;
+import java.lang.reflect.Method;
+import java.lang.reflect.Type;
+import java.util.Collections;
+
+import org.apache.commons.io.output.WriterOutputStream;
+import org.junit.Assume;
+import org.junit.Test;
+import org.springframework.hateoas.PagedResources.PageMetadata;
+import org.springframework.http.HttpHeaders;
+import org.springframework.http.HttpOutputMessage;
+import org.springframework.http.MediaType;
+import org.springframework.http.converter.json.MappingJackson2HttpMessageConverter;
+import org.springframework.util.ReflectionUtils;
+
+/**
+ * Integration tests for serialization of {@link PagedResources}.
+ * 
+ * @author Oliver Gierke
+ */
+public class Jackson2PagedResourcesIntegrationTest {
+
+	private static String REFERENCE = "{\"links\":[],\"content\":[{\"firstname\":\"Dave\",\"lastname\":\"Matthews\"}],\"page\":{\"size\":1,\"totalElements\":2,\"totalPages\":2,\"number\":0}}";
+
+	private static Method SPRING_4_2_WRITE_METHOD;
+
+	static {
+
+		try {
+			SPRING_4_2_WRITE_METHOD = MappingJackson2HttpMessageConverter.class.getMethod("write", Object.class, Type.class,
+					MediaType.class, HttpOutputMessage.class);
+		} catch (Exception e) {}
+	}
+
+	/**
+	 * @see SPR-13318
+	 */
+	@Test
+	public void serializesPagedResourcesCorrectly() throws Exception {
+
+		Assume.assumeThat(SPRING_4_2_WRITE_METHOD, is(notNullValue()));
+
+		User user = new User();
+		user.firstname = "Dave";
+		user.lastname = "Matthews";
+
+		PageMetadata metadata = new PagedResources.PageMetadata(1, 0, 2);
+		PagedResources<User> resources = new PagedResources<User>(Collections.singleton(user), metadata);
+
+		Method method = Sample.class.getMethod("someMethod");
+		StringWriter writer = new StringWriter();
+
+		HttpOutputMessage outputMessage = mock(HttpOutputMessage.class);
+		when(outputMessage.getBody()).thenReturn(new WriterOutputStream(writer));
+		when(outputMessage.getHeaders()).thenReturn(new HttpHeaders());
+
+		MappingJackson2HttpMessageConverter converter = new MappingJackson2HttpMessageConverter();
+
+		ReflectionUtils.invokeMethod(SPRING_4_2_WRITE_METHOD, converter, resources, method.getGenericReturnType(),
+				MediaType.APPLICATION_JSON, outputMessage);
+
+		assertThat(writer.toString(), is(REFERENCE));
+	}
+
+	interface Sample {
+		Resources<?> someMethod();
+	}
+
+	static class User {
+		public String firstname, lastname;
+	}
+}