Adding mocks for EndpointManager

Change-Id: I9adbc93e5d30b8294d689a923d6058c76cc176fe
diff --git a/pkg/kafka/endpoint_manager_test.go b/pkg/kafka/endpoint_manager_test.go
index 0ed5a3d..20b330a 100644
--- a/pkg/kafka/endpoint_manager_test.go
+++ b/pkg/kafka/endpoint_manager_test.go
@@ -195,7 +195,7 @@
 			logger.Fatalw("error-getting-endpoint", log.Fields{"error": err})
 		}
 		deviceIDs[deviceID] = endpoint
-		replicaID, err := tm.getReplicaAssignment(deviceID, serviceType)
+		replicaID, err := tm.GetReplicaAssignment(deviceID, serviceType)
 		if err != nil {
 			logger.Fatalw("error-getting-endpoint", log.Fields{"error": err})
 		}
@@ -219,7 +219,7 @@
 
 	// Verify that a device belong to the correct node
 	for deviceID := range deviceIDs {
-		replicaID, err := tm.getReplicaAssignment(deviceID, serviceType)
+		replicaID, err := tm.GetReplicaAssignment(deviceID, serviceType)
 		if err != nil {
 			logger.Fatalw("error-getting-topic", log.Fields{"error": err})
 		}