Merge pull request #28 from yihong1120/sweep/add-unit-test-for-launchUrl

Add unit test for SocialService.launchUrl method

test/social_service_test.dart

@@ -0,0 +1,26 @@
+import 'package:flutter_test/flutter_test.dart';
+import 'package:mockito/mockito.dart';
+import 'package:traffic_report_front_flutter/services/social_service.dart';
+import 'package:url_launcher/url_launcher.dart';
+
+class MockUrlLauncher extends Mock implements UrlLauncher {}
+
+void main() {
+  group('launchUrl', () {
+    final mockUrlLauncher = MockUrlLauncher();
+    final socialService = SocialService();
+
+    test('launches URL successfully', () async {
+      when(mockUrlLauncher.canLaunch(any)).thenAnswer((_) async => true);
+      when(mockUrlLauncher.launch(any)).thenAnswer((_) async => true);
+
+      expect(await socialService.launchUrl('http://valid.url'), completes);
+    });
+
+    test('throws an exception when URL cannot be launched', () async {
+      when(mockUrlLauncher.canLaunch(any)).thenAnswer((_) async => false);
+
+      expect(() async => await socialService.launchUrl('http://invalid.url'), throwsA(isA<Exception>()));
+    });
+  });
+}