Refine backendless share intake

lib/integrations/backend/backend_gateway_fake.dart

@@ -97,21 +97,9 @@ class BackendGatewayFake implements BackendGateway {
 
   @override
   Future<SyncPullResult> pullChanges({String? cursor, int limit = 200}) async {
-    final List<ChangeEnvelope> changes = <ChangeEnvelope>[
-      ChangeEnvelope(
-        schemaVersion: 1,
-        entityType: 'person',
-        entityId: 'person-1',
-        op: ChangeOperation.upsert,
-        modifiedAt: _seedTime,
-        clientMutationId: 'cm-1',
-        payload: const <String, dynamic>{'name': 'Alex', 'importance': 5},
-      ),
-    ];
-
     return SyncPullResult(
-      cursor: 'fake-pull-cursor-1',
-      changes: changes.take(limit).toList(),
+      cursor: cursor ?? 'fake-pull-cursor-empty',
+      changes: const <ChangeEnvelope>[],
     );
   }