DATAMONGO-1133 - Assert that Field aliasing is honored in Aggregation operations.

Added some test to show that field aliases are honored during object rendering in Aggregation operations.

Original pull request: #279.

Author: Thomas Darimont

spring-data-mongodb/src/test/java/org/springframework/data/mongodb/core/aggregation/AggregationTests.java

@@ -1066,7 +1066,7 @@ public void shouldHonorFieldAliasesForFieldReferences() {
 		DBObject result = results.getMappedResults().get(0);
 
 		assertThat(result.get("_id"), is(equalTo((Object) "counter1")));
-		assertThat(result.get("totalValue"), is(equalTo((Object) 42.0)));
+		assertThat(result.get("totalValue"), is(equalTo((Object) 100.0)));
 	}
 
 	private void assertLikeStats(LikeStats like, String id, long count) {

spring-data-mongodb/src/test/java/org/springframework/data/mongodb/core/aggregation/MeterData.java

@@ -22,13 +22,12 @@
  * @author Thomas Darimont
  */
 public class MeterData {
+	@Id String id;
 
-	@Id String resourceId;
+	String resourceId;
 	@Field("counter_name") String counterName;
 	double counterVolume;
 
-	public MeterData() {}
-
 	public MeterData(String resourceId, String counterName, double counterVolume) {
 
 		this.resourceId = resourceId;