feat(macos): create my_plugin_macos (#2)

.github/workflows/my_plugin_macos.yaml

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+name: my_plugin_macos
+
+on:
+  pull_request:
+    paths:
+      - ".github/workflows/my_plugin_macos.yaml"
+      - "src/my_plugin_macos/**"
+  push:
+    branches:
+      - main
+    paths:
+      - ".github/workflows/my_plugin_macos.yaml"
+      - "src/my_plugin_macos/**"
+
+jobs:
+  build:
+    uses: VeryGoodOpenSource/very_good_workflows/.github/workflows/flutter_package.yml@v1
+    with:
+      flutter_channel: stable
+      flutter_version: 2.10.1
+      working_directory: src/my_plugin_macos

src/my_plugin_macos/.gitignore

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+.packages
+.flutter-plugins
+pubspec.lock

src/my_plugin_macos/CHANGELOG.md

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+# 0.1.0+1
+
+- Initial release of this plugin.

src/my_plugin_macos/LICENSE

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+MIT License
+
+Copyright (c) 2022 Very Good Ventures
+
+Permission is hereby granted, free of charge, to any person obtaining a copy
+of this software and associated documentation files (the "Software"), to deal
+in the Software without restriction, including without limitation the rights
+to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+copies of the Software, and to permit persons to whom the Software is
+furnished to do so, subject to the following conditions:
+
+The above copyright notice and this permission notice shall be included in all
+copies or substantial portions of the Software.
+
+THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
+SOFTWARE.

src/my_plugin_macos/README.md

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+# my\_plugin\_macos
+
+[![style: very good analysis][very_good_analysis_badge]][very_good_analysis_link]
+
+The macos implementation of `my_plugin`.
+
+## Usage
+
+This package is [endorsed][endorsed_link], which means you can simply use `my_plugin`
+normally. This package will be automatically included in your app when you do.
+
+[endorsed_link]: https://flutter.dev/docs/development/packages-and-plugins/developing-packages#endorsed-federated-plugin
+[very_good_analysis_badge]: https://img.shields.io/badge/style-very_good_analysis-B22C89.svg
+[very_good_analysis_link]: https://pub.dev/packages/very_good_analysis

src/my_plugin_macos/analysis_options.yaml

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+include: package:very_good_analysis/analysis_options.2.4.0.yaml

src/my_plugin_macos/lib/my_plugin_macos.dart

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+import 'package:flutter/foundation.dart';
+import 'package:flutter/services.dart';
+import 'package:my_plugin_platform_interface/my_plugin_platform_interface.dart';
+
+/// The MacOS implementation of [MyPluginPlatform].
+class MyPluginMacOS extends MyPluginPlatform {
+  /// The method channel used to interact with the native platform.
+  @visibleForTesting
+  final methodChannel = const MethodChannel('my_plugin_macos');
+
+  /// Registers this class as the default instance of [MyPluginPlatform]
+  static void registerWith() {
+    MyPluginPlatform.instance = MyPluginMacOS();
+  }
+
+  @override
+  Future<String?> getPlatformName() {
+    return methodChannel.invokeMethod<String>('getPlatformName');
+  }
+}

src/my_plugin_macos/macos/Classes/MyPluginPlugin.swift

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+import FlutterMacOS
+import Foundation
+
+public class MyPluginPlugin: NSObject, FlutterPlugin {
+  public static func register(with registrar: FlutterPluginRegistrar) {
+    let channel = FlutterMethodChannel(
+      name: "my_plugin_macos",
+      binaryMessenger: registrar.messenger)
+    let instance = MyPluginPlugin()
+    registrar.addMethodCallDelegate(instance, channel: channel)
+  }
+
+  public func handle(_ call: FlutterMethodCall, result: @escaping FlutterResult) {
+    switch call.method {
+    case "getPlatformName":
+      result("MacOS")    
+    default:
+      result(FlutterMethodNotImplemented)
+    }
+  }
+}

src/my_plugin_macos/macos/my_plugin_macos.podspec

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+#
+# To learn more about a Podspec see http://guides.cocoapods.org/syntax/podspec.html
+#
+Pod::Spec.new do |s|
+  s.name             = 'my_plugin_macos'
+  s.version          = '0.0.1'
+  s.summary          = 'A macOS implementation of the my_plugin plugin.'
+  s.description      = <<-DESC
+  A macOS implementation of the my_plugin plugin.
+                       DESC
+  s.homepage         = 'http://example.com'
+  s.license          = { :type => 'BSD', :file => '../LICENSE' }
+  s.author           = { 'Your Company' => 'email@example.com' }
+  s.source           = { :path => '.' }
+  s.source_files = 'Classes/**/*'
+  s.dependency 'FlutterMacOS'
+
+  s.platform = :osx
+  s.osx.deployment_target = '10.11'
+  s.swift_version = '5.0'
+end
+

src/my_plugin_macos/pubspec.yaml

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+name: my_plugin_macos
+description: MacOS implementation of the my_plugin plugin
+version: 0.1.0+1
+publish_to: none
+
+environment:
+  sdk: ">=2.12.0 <3.0.0"
+  flutter: ">=2.0.0"
+
+flutter:
+  plugin:
+    implements: my_plugin
+    platforms:
+      macos:
+        pluginClass: MyPluginPlugin
+        dartPluginClass: MyPluginMacOS
+
+dependencies:
+  flutter:
+    sdk: flutter
+  my_plugin_platform_interface:
+    path: ../my_plugin_platform_interface
+
+dev_dependencies:
+  flutter_test:
+    sdk: flutter
+  very_good_analysis: ^2.4.0

src/my_plugin_macos/test/my_plugin_macos_test.dart

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+import 'package:flutter/services.dart';
+import 'package:flutter_test/flutter_test.dart';
+import 'package:my_plugin_macos/my_plugin_macos.dart';
+import 'package:my_plugin_platform_interface/my_plugin_platform_interface.dart';
+
+void main() {
+  TestWidgetsFlutterBinding.ensureInitialized();
+
+  group('MyPluginMacOS', () {
+    const kPlatformName = 'MacOS';
+    late MyPluginMacOS myPlugin;
+    late List<MethodCall> log;
+
+    setUp(() async {
+      myPlugin = MyPluginMacOS();
+
+      log = <MethodCall>[];
+      TestDefaultBinaryMessengerBinding.instance!.defaultBinaryMessenger
+          .setMockMethodCallHandler(myPlugin.methodChannel, (methodCall) async {
+        log.add(methodCall);
+        switch (methodCall.method) {
+          case 'getPlatformName':
+            return kPlatformName;
+          default:
+            return null;
+        }
+      });
+    });
+
+    test('can be registered', () {
+      MyPluginMacOS.registerWith();
+      expect(MyPluginPlatform.instance, isA<MyPluginMacOS>());
+    });
+
+    test('getPlatformName returns correct name', () async {
+      final name = await myPlugin.getPlatformName();
+      expect(
+        log,
+        <Matcher>[isMethodCall('getPlatformName', arguments: null)],
+      );
+      expect(name, equals(kPlatformName));
+    });
+  });
+}