Initial project

packages/notification_sdk/test/notification_sdk_method_channel_test.dart

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+import 'package:flutter/services.dart';
+import 'package:flutter_test/flutter_test.dart';
+import 'package:notification_sdk/notification_sdk_method_channel.dart';
+
+void main() {
+  TestWidgetsFlutterBinding.ensureInitialized();
+
+  MethodChannelNotificationSdk platform = MethodChannelNotificationSdk();
+  const MethodChannel channel = MethodChannel('notification_sdk');
+
+  setUp(() {
+    TestDefaultBinaryMessengerBinding.instance.defaultBinaryMessenger.setMockMethodCallHandler(
+      channel,
+      (MethodCall methodCall) async {
+        return '42';
+      },
+    );
+  });
+
+  tearDown(() {
+    TestDefaultBinaryMessengerBinding.instance.defaultBinaryMessenger.setMockMethodCallHandler(channel, null);
+  });
+
+  test('getPlatformVersion', () async {
+    expect(await platform.getPlatformVersion(), '42');
+  });
+}

packages/notification_sdk/test/notification_sdk_test.dart

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+import 'package:flutter_test/flutter_test.dart';
+import 'package:notification_sdk/notification_sdk.dart';
+import 'package:notification_sdk/notification_sdk_platform_interface.dart';
+import 'package:notification_sdk/notification_sdk_method_channel.dart';
+import 'package:plugin_platform_interface/plugin_platform_interface.dart';
+
+class MockNotificationSdkPlatform
+    with MockPlatformInterfaceMixin
+    implements NotificationSdkPlatform {
+
+  @override
+  Future<String?> getPlatformVersion() => Future.value('42');
+}
+
+void main() {
+  final NotificationSdkPlatform initialPlatform = NotificationSdkPlatform.instance;
+
+  test('$MethodChannelNotificationSdk is the default instance', () {
+    expect(initialPlatform, isInstanceOf<MethodChannelNotificationSdk>());
+  });
+
+  test('getPlatformVersion', () async {
+    NotificationSdkApi notificationSdkPlugin = NotificationSdkApi();
+    MockNotificationSdkPlatform fakePlatform = MockNotificationSdkPlatform();
+    NotificationSdkPlatform.instance = fakePlatform;
+
+    expect(await notificationSdkPlugin.platformVersion(), '42');
+  });
+}