implement example

examples/postly/test/widget_test.dart

@@ -0,0 +1,45 @@
+// This is a basic Flutter widget test.
+//
+// To perform an interaction with a widget in your test, use the WidgetTester
+// utility in the flutter_test package. For example, you can send tap and scroll
+// gestures. You can also use WidgetTester to find child widgets in the widget
+// tree, read text, and verify that the values of widget properties are correct.
+
+import 'package:dio/dio.dart';
+import 'package:flutter/material.dart';
+import 'package:flutter_test/flutter_test.dart';
+import 'package:postly/data/network/json_placeholder_api.dart';
+import 'package:postly/data/post_repository_impl.dart';
+import 'package:postly/domain/repository/post_repository.dart';
+
+import 'package:postly/main.dart';
+
+void main() {
+  late Dio dio;
+  late JsonPlaceholderApi api;
+  late PostRepository repository;
+
+  setUp(() {
+    dio = Dio();
+    api = JsonPlaceholderApi(dio);
+    repository = PostRepositoryImpl(api);
+  });
+  testWidgets('Counter increments smoke test', (WidgetTester tester) async {
+    // Build our app and trigger a frame.
+    await tester.pumpWidget(MyApp(
+      repository: repository,
+    ));
+
+    // Verify that our counter starts at 0.
+    expect(find.text('0'), findsOneWidget);
+    expect(find.text('1'), findsNothing);
+
+    // Tap the '+' icon and trigger a frame.
+    await tester.tap(find.byIcon(Icons.add));
+    await tester.pump();
+
+    // Verify that our counter has incremented.
+    expect(find.text('0'), findsNothing);
+    expect(find.text('1'), findsOneWidget);
+  });
+}