snapshot of https://github.com/flutter/samples.git (main, 2026-09-16; blobs > 131072B omitted)

platform_channels/test/src/method_channel_demo_test.dart

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+// Copyright 2020 The Flutter team. All rights reserved.
+// Use of this source code is governed by a BSD-style license that can be
+// found in the LICENSE file.
+
+import 'package:flutter/material.dart';
+import 'package:flutter/services.dart';
+import 'package:flutter_test/flutter_test.dart';
+import 'package:platform_channels/src/method_channel_demo.dart';
+
+void main() {
+  group('MethodChannelDemo tests', () {
+    testWidgets('MethodChannelDemo count test', (tester) async {
+      tester.binding.defaultBinaryMessenger.setMockMethodCallHandler(
+        const MethodChannel('methodChannelDemo'),
+        (call) async {
+          var count = call.arguments['count'] as int;
+          if (call.method == 'increment') {
+            return ++count;
+          } else if (call.method == 'decrement') {
+            return --count;
+          }
+
+          return MissingPluginException();
+        },
+      );
+      await tester.pumpWidget(
+        const MaterialApp(home: MethodChannelDemo()),
+      );
+
+      // Initially the value of count should be 0.
+      expect(find.text('Value of count is 0'), findsOneWidget);
+
+      // Tap the ElevatedButton with Icons.add to increment the value of count.
+      await tester.tap(find.byIcon(Icons.add));
+      await tester.pump();
+
+      expect(find.text('Value of count is 1'), findsOneWidget);
+
+      // Tap the ElevatedButton with Icons.remove to decrement the value of count.
+      await tester.tap(find.byIcon(Icons.remove));
+      await tester.pump();
+
+      expect(find.text('Value of count is 0'), findsOneWidget);
+    });
+  });
+}