From 629028a7efa7a98c99e3559938279cea468270bb Mon Sep 17 00:00:00 2001
From: Oliver Gierke <ogierke@gopivotal.com>
Date: Tue, 10 Feb 2015 15:28:13 +0100
Subject: [PATCH] #236, #286 - Added test case to show how to add empty
 embedded collections.

---
 .../hateoas/hal/Jackson2HalIntegrationTest.java | 17 +++++++++++++++++
 1 file changed, 17 insertions(+)

diff --git a/src/test/java/org/springframework/hateoas/hal/Jackson2HalIntegrationTest.java b/src/test/java/org/springframework/hateoas/hal/Jackson2HalIntegrationTest.java
index af459a2e..1ff09e28 100644
--- a/src/test/java/org/springframework/hateoas/hal/Jackson2HalIntegrationTest.java
+++ b/src/test/java/org/springframework/hateoas/hal/Jackson2HalIntegrationTest.java
@@ -36,6 +36,7 @@ import org.springframework.hateoas.ResourceSupport;
 import org.springframework.hateoas.Resources;
 import org.springframework.hateoas.UriTemplate;
 import org.springframework.hateoas.core.AnnotationRelProvider;
+import org.springframework.hateoas.core.EmbeddedWrappers;
 import org.springframework.hateoas.hal.Jackson2HalModule.HalHandlerInstantiator;
 
 import com.fasterxml.jackson.databind.ObjectMapper;
@@ -344,6 +345,22 @@ public class Jackson2HalIntegrationTest extends AbstractJackson2MarshallingInteg
 		assertThat(getCuriedObjectMapper(provider).writeValueAsString(resources), is(MULTIPLE_CURIES_DOCUMENT));
 	}
 
+	/**
+	 * @see #286, #236
+	 */
+	@Test
+	public void rendersEmptyEmbeddedCollections() throws Exception {
+
+		EmbeddedWrappers wrappers = new EmbeddedWrappers(false);
+
+		List<Object> values = new ArrayList<Object>();
+		values.add(wrappers.emptyCollectionOf(SimpleAnnotatedPojo.class));
+
+		Resources<Object> resources = new Resources<Object>(values);
+
+		assertThat(write(resources), is("{\"_embedded\":{\"pojos\":[]}}"));
+	}
+
 	private static Resources<Resource<SimpleAnnotatedPojo>> setupAnnotatedPagedResources() {
 
 		List<Resource<SimpleAnnotatedPojo>> content = new ArrayList<Resource<SimpleAnnotatedPojo>>();