adding packages

experimental/pocketbase_sync/test/simulation/mock_connectivity.dart

@@ -0,0 +1,41 @@
+import 'dart:async';
+
+// Mocking the result enum to avoid depending on connectivity_plus directly in the harness
+// if the package is not yet added to dependencies (it wasn't in the list I saw).
+// But usually one would import 'package:connectivity_plus/connectivity_plus.dart';
+// Since I haven't added connectivity_plus to the package dependencies (I only added http, etc),
+// I will define a compatible enum here. If the user app uses connectivity_plus, they can map it.
+
+enum ConnectivityResult { wifi, mobile, none, ethernet, bluetooth, other, vpn }
+
+/// A mock adapter for simulating OS connectivity changes.
+class MockConnectivity {
+  final _controller = StreamController<ConnectivityResult>.broadcast();
+
+  Stream<ConnectivityResult> get onConnectivityChanged => _controller.stream;
+
+  ConnectivityResult _current = ConnectivityResult.wifi;
+  ConnectivityResult get current => _current;
+
+  /// Simulates going offline (Airplane Mode).
+  void goOffline() {
+    _current = ConnectivityResult.none;
+    _controller.add(_current);
+  }
+
+  /// Simulates connecting to WiFi.
+  void goWifi() {
+    _current = ConnectivityResult.wifi;
+    _controller.add(_current);
+  }
+
+  /// Simulates connecting to Mobile Data.
+  void goMobile() {
+    _current = ConnectivityResult.mobile;
+    _controller.add(_current);
+  }
+
+  void dispose() {
+    _controller.close();
+  }
+}