Unittest for pinned_post_screen (PalisadoesFoundation#2207)

* Added unittest for pinned_post_screen

* Added unittest for pinned_post_screen

* updated

* Updated

lib/views/after_auth_screens/feed/pinned_post_screen.dart

@@ -1,18 +1,22 @@
 import 'package:cached_network_image/cached_network_image.dart';
 import 'package:flutter/material.dart';
+import 'package:flutter_cache_manager/flutter_cache_manager.dart';
 import 'package:talawa/apptheme.dart';
 
 import 'package:talawa/services/size_config.dart';
 
 /// Pinned post screen.
 ///
 class PinnedPostScreen extends StatefulWidget {
-  const PinnedPostScreen({super.key, required this.post});
+  const PinnedPostScreen({super.key, required this.post, this.cacheManager});
 
   /// Contains the data of the post.
   ///
   final Map<String, String> post;
 
+  /// Custom avatar data.
+  final BaseCacheManager? cacheManager;
+
   @override
   State<PinnedPostScreen> createState() => _PinnedPostScreenState();
 }
@@ -55,10 +59,8 @@ class _PinnedPostScreenState extends State<PinnedPostScreen> {
               ],
             ),
             CachedNetworkImage(
-              cacheKey: widget.post['postId'],
-              imageUrl: (widget.post['imageUrl'] ?? '').isEmpty
-                  ? 'placeHolderUrl'
-                  : widget.post['imageUrl']!,
+              cacheManager: widget.cacheManager,
+              imageUrl: widget.post['imageUrl']!,
               errorWidget: (context, url, error) {
                 return const CircularProgressIndicator();
               },

test/views/after_auth_screens/feed/pinned_post_screen.dart

@@ -0,0 +1,144 @@
+// ignore_for_file: talawa_api_doc
+// ignore_for_file: talawa_good_doc_comments
+import 'package:cached_network_image/cached_network_image.dart';
+import 'package:file/local.dart';
+import 'package:flutter/material.dart';
+import 'package:flutter_cache_manager/flutter_cache_manager.dart';
+import 'package:flutter_localizations/flutter_localizations.dart';
+import 'package:flutter_test/flutter_test.dart';
+import 'package:get_it/get_it.dart';
+import 'package:mockito/mockito.dart';
+import 'package:network_image_mock/network_image_mock.dart';
+import 'package:talawa/router.dart' as router;
+import 'package:talawa/services/navigation_service.dart';
+import 'package:talawa/services/size_config.dart';
+import 'package:talawa/utils/app_localization.dart';
+import 'package:talawa/view_model/lang_view_model.dart';
+import 'package:talawa/views/after_auth_screens/feed/pinned_post_screen.dart';
+import 'package:talawa/views/base_view.dart';
+import '../../../helpers/test_helpers.dart';
+import '../../../helpers/test_locator.dart';
+
+class MockCacheManager extends Mock implements DefaultCacheManager {
+  static const fileSystem = LocalFileSystem();
+
+  @override
+  Stream<FileResponse> getImageFile(
+    String url, {
+    String? key,
+    Map<String, String>? headers,
+    bool withProgress = true,
+    int? maxHeight,
+    int? maxWidth,
+  }) async* {
+    if (url == "wrong_url") {
+      throw Exception("File not found");
+    } else {
+      yield FileInfo(
+        fileSystem.file(url),
+        FileSource.Cache,
+        DateTime(2050),
+        url,
+      );
+    }
+  }
+}
+
+Widget createApp() {
+  return BaseView<AppLanguage>(
+    onModelReady: (model) => model.initialize(),
+    builder: (context, langModel, child) {
+      return MaterialApp(
+        locale: const Locale('en'),
+        localizationsDelegates: [
+          const AppLocalizationsDelegate(isTest: true),
+          GlobalMaterialLocalizations.delegate,
+          GlobalWidgetsLocalizations.delegate,
+        ],
+        home: const PinnedPostScreen(
+          post: {
+            'title': 'Sample Title',
+            'time': '23:00',
+            'postId': 'postId',
+            'imageUrl': 'imageUrl',
+          },
+        ),
+        navigatorKey: locator<NavigationService>().navigatorKey,
+        onGenerateRoute: router.generateRoute,
+      );
+    },
+  );
+}
+
+Future<void> showPinnedPostScreen(WidgetTester tester) async {
+  await tester.pumpWidget(createApp());
+  await tester.pumpAndSettle();
+}
+
+void main() {
+  TestWidgetsFlutterBinding.ensureInitialized();
+
+  setUp(() {
+    registerServices();
+    locator<SizeConfig>().test();
+  });
+  GetIt.instance.registerSingleton<BaseCacheManager>(
+    MockCacheManager(),
+  );
+
+  GetIt.instance.registerSingleton<NavigationService>(
+    NavigationService(),
+  );
+
+  GetIt.instance.registerSingleton<SizeConfig>(
+    SizeConfig(),
+  );
+
+  tearDown(() {
+    unregisterServices();
+  });
+
+  testWidgets('Check if Pinned Post Screen page shows up', (tester) async {
+    await showPinnedPostScreen(tester);
+    expect(find.byType(SafeArea), findsOneWidget);
+  });
+
+  group('Check if Pinned Post Screen page has -', () {
+    testWidgets('Title', (tester) async {
+      await showPinnedPostScreen(tester);
+      expect(find.text('Sample Title'), findsOneWidget);
+    });
+
+    testWidgets('Time', (tester) async {
+      await showPinnedPostScreen(tester);
+      expect(find.text('23:00hr'), findsOneWidget);
+    });
+  });
+
+  // Check if cached network image is working
+  testWidgets('Check if CachedNetworkImage is working', (tester) async {
+    await mockNetworkImagesFor(() async {
+      await showPinnedPostScreen(tester);
+      expect(find.byType(CachedNetworkImage), findsOneWidget);
+    });
+  });
+
+  testWidgets('Check if CachedNetworkImage shows CircularProgressIndicator',
+      (tester) async {
+    await tester.pumpWidget(
+      MaterialApp(
+        home: PinnedPostScreen(
+          post: {
+            'title': 'Sample Title',
+            'time': '23:00',
+            'postId': 'postId',
+            'imageUrl': 'wrong_url',
+          },
+          cacheManager: GetIt.instance.get<BaseCacheManager>(),
+        ),
+      ),
+    );
+    await tester.pump();
+    expect(find.byType(CircularProgressIndicator), findsOneWidget);
+  });
+}