DATAJDBC-370 - Polishing.

Adding a missing issue reference to a test.

Original Pull Request: #151

spring-data-jdbc/src/test/java/org/springframework/data/jdbc/core/JdbcAggregateTemplateIntegrationTests.java

@@ -436,7 +436,7 @@ public class JdbcAggregateTemplateIntegrationTests {
 		assertThat(reloaded.binaryData).isEqualTo(new byte[] { 1, 23, 42 });
 	}
 
-	@Test
+	@Test // DATAJDBC-340
 	public void saveAndLoadLongChain() {
 
 		Chain4 chain4 = new Chain4();