Initial Commit for PlaformChannel Sample App (#453)

platform_channels/test/home_page_test.dart

@@ -0,0 +1,19 @@
+// 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_test/flutter_test.dart';
+import 'package:flutter/material.dart';
+import 'package:platform_channels/main.dart';
+
+void main() {
+  group('HomePage tests', () {
+    testWidgets('HomePage has multiple Text widgets', (tester) async {
+      await tester.pumpWidget(MaterialApp(
+        home: HomePage(),
+      ));
+
+      expect(find.byType(Text), findsWidgets);
+    });
+  });
+}

platform_channels/test/src/method_channel_demo_test.dart

@@ -0,0 +1,49 @@
+// 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', () {
+    setUpAll(() {
+      final methodChannel = MethodChannel('methodChannelDemo');
+
+      // Register a mock MethodCallHandler.
+      methodChannel.setMockMethodCallHandler((call) async {
+        var count = call.arguments['count'] as int;
+        if (call.method == 'increment') {
+          return ++count;
+        } else if (call.method == 'decrement') {
+          return --count;
+        }
+
+        return MissingPluginException();
+      });
+    });
+
+    testWidgets('MethodChannelDemo count test', (tester) async {
+      await tester.pumpWidget(MaterialApp(
+        home: MethodChannelDemo(),
+      ));
+
+      // Initially the value of count should be 0.
+      expect(find.text('Value of count is 0'), findsOneWidget);
+
+      // Tap the RaisedButton 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 RaisedButton 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);
+    });
+  });
+}