diff --git a/types/debessmann/debessmann-tests.ts b/types/debessmann/debessmann-tests.ts
new file mode 100644
index 0000000000..3e44ff8cd6
--- /dev/null
+++ b/types/debessmann/debessmann-tests.ts
@@ -0,0 +1,13 @@
+import {DM, Event, EventId} from 'debessmann';
+
+let eventId: EventId = {seq: 0, time: new Date()};
+let e: Event = {_id: eventId, headers: {'header1': 'header1Val'}};
+
+let dm: DM = {
+    init(endpoint: string, auth: string): void {
+	},
+    send(data: Event): void {
+	}
+};
+dm.init("ep.debessmann.com", "AUTHID");
+dm.send(e);
diff --git a/types/debessmann/index.d.ts b/types/debessmann/index.d.ts
index b99dc2809b..acb415faa7 100644
--- a/types/debessmann/index.d.ts
+++ b/types/debessmann/index.d.ts
@@ -10,11 +10,11 @@ export class EventId {
 
 export class Event {
     _id: EventId;
-    id: string;
-    timestamp: string;
-    payload: any;
+    timestamp?: string;
+    id?: string;
+    payload?: any;
     headers: { [key: string]: string; };
-    metrics: { [key: string]: number; };
+    metrics?: { [key: string]: number; };
 }
 
 export class DM {