Add vpn connection detector tests

.flutter-plugins

@@ -1,2 +1,2 @@
 # This is a generated file; do not edit or check into version control.
-connectivity_plus=/Users/bazie/.pub-cache/hosted/pub.dev/connectivity_plus-4.0.2/
+connectivity_plus=C:\\Users\\Ahmod\\AppData\\Local\\Pub\\Cache\\hosted\\pub.dev\\connectivity_plus-4.0.2\\

.flutter-plugins-dependencies

@@ -1 +1 @@
-{"info":"This is a generated file; do not edit or check into version control.","plugins":{"ios":[{"name":"connectivity_plus","path":"/Users/bazie/.pub-cache/hosted/pub.dev/connectivity_plus-4.0.2/","native_build":true,"dependencies":[]}],"android":[{"name":"connectivity_plus","path":"/Users/bazie/.pub-cache/hosted/pub.dev/connectivity_plus-4.0.2/","native_build":true,"dependencies":[]}],"macos":[{"name":"connectivity_plus","path":"/Users/bazie/.pub-cache/hosted/pub.dev/connectivity_plus-4.0.2/","native_build":true,"dependencies":[]}],"linux":[{"name":"connectivity_plus","path":"/Users/bazie/.pub-cache/hosted/pub.dev/connectivity_plus-4.0.2/","native_build":false,"dependencies":[]}],"windows":[{"name":"connectivity_plus","path":"/Users/bazie/.pub-cache/hosted/pub.dev/connectivity_plus-4.0.2/","native_build":true,"dependencies":[]}],"web":[{"name":"connectivity_plus","path":"/Users/bazie/.pub-cache/hosted/pub.dev/connectivity_plus-4.0.2/","dependencies":[]}]},"dependencyGraph":[{"name":"connectivity_plus","dependencies":[]}],"date_created":"2023-08-28 01:18:46.159993","version":"3.13.0"}
+{"info":"This is a generated file; do not edit or check into version control.","plugins":{"ios":[{"name":"connectivity_plus","path":"C:\\\\Users\\\\Ahmod\\\\AppData\\\\Local\\\\Pub\\\\Cache\\\\hosted\\\\pub.dev\\\\connectivity_plus-4.0.2\\\\","native_build":true,"dependencies":[]}],"android":[{"name":"connectivity_plus","path":"C:\\\\Users\\\\Ahmod\\\\AppData\\\\Local\\\\Pub\\\\Cache\\\\hosted\\\\pub.dev\\\\connectivity_plus-4.0.2\\\\","native_build":true,"dependencies":[]}],"macos":[{"name":"connectivity_plus","path":"C:\\\\Users\\\\Ahmod\\\\AppData\\\\Local\\\\Pub\\\\Cache\\\\hosted\\\\pub.dev\\\\connectivity_plus-4.0.2\\\\","native_build":true,"dependencies":[]}],"linux":[{"name":"connectivity_plus","path":"C:\\\\Users\\\\Ahmod\\\\AppData\\\\Local\\\\Pub\\\\Cache\\\\hosted\\\\pub.dev\\\\connectivity_plus-4.0.2\\\\","native_build":false,"dependencies":[]}],"windows":[{"name":"connectivity_plus","path":"C:\\\\Users\\\\Ahmod\\\\AppData\\\\Local\\\\Pub\\\\Cache\\\\hosted\\\\pub.dev\\\\connectivity_plus-4.0.2\\\\","native_build":true,"dependencies":[]}],"web":[{"name":"connectivity_plus","path":"C:\\\\Users\\\\Ahmod\\\\AppData\\\\Local\\\\Pub\\\\Cache\\\\hosted\\\\pub.dev\\\\connectivity_plus-4.0.2\\\\","dependencies":[]}]},"dependencyGraph":[{"name":"connectivity_plus","dependencies":[]}],"date_created":"2023-09-15 13:00:08.378147","version":"3.13.4"}

lib/vpn_connection_detector.dart

@@ -2,6 +2,7 @@ import 'dart:async';
 import 'dart:io';
 
 import 'package:connectivity_plus/connectivity_plus.dart';
+import 'package:flutter/cupertino.dart';
 
 ///[VpnConnectionState] has two values [connected],[disconnected]
 ///return [VpnConnectionState.connected] if vpn connection is active
@@ -29,7 +30,7 @@ class VpnConnectionDetector {
     _connectivitySubscription = Connectivity()
         .onConnectivityChanged
         .listen((ConnectivityResult result) async {
-      await _checkVpnStatus();
+      await checkVpnStatus();
     });
   }
   final StreamController<VpnConnectionState> _controller =
@@ -58,7 +59,7 @@ class VpnConnectionDetector {
   Stream<VpnConnectionState> get vpnConnectionStream =>
       _controller.stream.asBroadcastStream();
 
-  Future<void> _checkVpnStatus() async {
+  Future<void> checkVpnStatus() async {
     final currentVpnStatus = await isVpnActive();
     if (currentVpnStatus) {
       _controller.add(VpnConnectionState.connected);
@@ -74,6 +75,9 @@ class VpnConnectionDetector {
     _connectivitySubscription?.cancel();
   }
 
+  static List<String> get commonVpnInterfaceNamePatterns =>
+      _commonVpnInterfaceNamePatterns;
+
   static final List<String> _commonVpnInterfaceNamePatterns = [
     'tun', // Linux/Unix TUN interface
     'tap', // Linux/Unix TAP interface

test/vpn_connection_detector_test.dart

@@ -1 +1,32 @@
+import 'package:flutter_test/flutter_test.dart';
+import 'package:vpn_connection_detector/vpn_connection_detector.dart';
 
+void main() {
+  TestWidgetsFlutterBinding.ensureInitialized();
+
+  group(' Tests', () {
+    late VpnConnectionDetector vpnConnectionDetector;
+
+    setUp(() {
+      vpnConnectionDetector = VpnConnectionDetector();
+    });
+
+    tearDown(() {
+      vpnConnectionDetector.dispose();
+    });
+
+    test('Initial connection status is disconnected', () {
+      /** vpnConnectionStream is not returning any value, to get a value, there is a need to call
+      checkVpnStatus by making it public **/
+      vpnConnectionDetector.checkVpnStatus();
+
+      expect(vpnConnectionDetector.vpnConnectionStream,
+          emits(VpnConnectionState.disconnected));
+    });
+
+    test('Check VPN status when not connected', () async {
+      final isConnected = await VpnConnectionDetector.isVpnActive();
+      expect(isConnected, false);
+    });
+  });
+}