add ResponseEntity<Void> feign test

spring-cloud-netflix-core/src/test/java/org/springframework/cloud/netflix/feign/SpringDecoderTests.java

@@ -95,6 +95,17 @@ public class SpringDecoderTests extends FeignClientFactoryBean {
 		assertEquals("first hello didn't match", "hello world 1", hellos.get(0));
 	}
 
+	@Test
+	public void testResponseEntityVoid() {
+		ResponseEntity<Void> response = testClient().getHelloVoid();
+		assertNotNull("response was null", response);
+		List<String> headerVals = response.getHeaders().get("X-test-header");
+		assertNotNull("headerVals was null", headerVals);
+		assertEquals("headerVals size was wrong", 1, headerVals.size());
+		String header = headerVals.get(0);
+		assertEquals("header was wrong", "myval", header);
+	}
+
 	@Data
 	@AllArgsConstructor
 	@NoArgsConstructor
@@ -106,6 +117,9 @@ public class SpringDecoderTests extends FeignClientFactoryBean {
 		@RequestMapping(method = RequestMethod.GET, value = "/helloresponse")
 		public ResponseEntity<Hello> getHelloResponse();
 
+		@RequestMapping(method = RequestMethod.GET, value = "/hellovoid")
+		public ResponseEntity<Void> getHelloVoid();
+
 		@RequestMapping(method = RequestMethod.GET, value = "/hello")
 		public Hello getHello();
 
@@ -127,6 +141,11 @@ public class SpringDecoderTests extends FeignClientFactoryBean {
 		}
 
 		@Override
+		public ResponseEntity<Void> getHelloVoid() {
+			return ResponseEntity.noContent().header("X-test-header", "myval").build();
+		}
+
+		@Override
 		public Hello getHello() {
 			return new Hello("hello world 1");
 		}