Merge pull request #31 from yihong1120/sweep/add-docstrings

Add Docstrings to test/social_service_test.dart

test/social_service_test.dart

@@ -1,22 +1,26 @@
+/// Tests for the 'launchUrl' function in the 'SocialService' class.
 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 {}
 
+/// The 'main' function is the entry point for the tests and contains a group of tests for the 'launchUrl' function.
 void main() {
   group('launchUrl', () {
     final mockUrlLauncher = MockUrlLauncher();
     final socialService = SocialService();
 
+    /// Tests if the 'launchUrl' function can successfully launch a URL.
     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);
     });
 
+    /// Tests if the 'launchUrl' function throws an exception when the URL cannot be launched.
     test('throws an exception when URL cannot be launched', () async {
       when(mockUrlLauncher.canLaunch(any)).thenAnswer((_) async => false);