Add check to ensure attachment content is deleted

Make sure that attachment content is actually removed from the mongo
database when the attachment is deleted.

server/src/fat/java/com/ibm/ws/lars/rest/ApiTest.java

@@ -65,6 +65,7 @@
 import com.mongodb.DB;
 import com.mongodb.DBCollection;
 import com.mongodb.DBObject;
+import com.mongodb.gridfs.GridFS;
 
 /**
  * Tests for the LARS REST API, which is designed to be compatible with the legacy Massive server.
@@ -385,6 +386,9 @@ public void testCRUDAttachmentWithContent() throws Exception {
 
  AttachmentList attachmentsAfterDeletion = repository.doGetAllAttachmentsForAsset(returnedAsset.get_id());
  assertTrue("Asset should have zero attachments after deletion of only attachment", attachmentsAfterDeletion.isEmpty());
+
+ GridFS fs = new GridFS(FatUtils.getMongoDB());
+ assertEquals("Files in database after delete", 0, fs.getFileList().size());
  }
 
  /**