fix: add support for platform testing

src/my_plugin/my_plugin/example/actions/check_platform_name/lib/src/check_platform_name.dart

@@ -14,15 +14,39 @@ import 'package:fluttium/fluttium.dart';
 /// {@endtemplate}
 class CheckPlatformName extends Action {
   /// {@macro check_platform_name}
-  const CheckPlatformName();
+  const CheckPlatformName({
+    @visibleForTesting bool Function() isAndroid = _platformIsAndroid,
+    @visibleForTesting bool Function() isIOS = _platformIsIOS,
+    @visibleForTesting bool Function() isLinux = _platformIsLinux,
+    @visibleForTesting bool Function() isMacOS = _platformIsMacOS,
+    @visibleForTesting bool Function() isWindows = _platformIsWindows,
+    @visibleForTesting bool isWeb = kIsWeb,
+  })  : _isAndroid = isAndroid,
+        _isIOS = isIOS,
+        _isLinux = isLinux,
+        _isMacOS = isMacOS,
+        _isWindows = isWindows,
+        _isWeb = isWeb;
+
+  final bool _isWeb;
+
+  final bool Function() _isAndroid;
+
+  final bool Function() _isIOS;
+
+  final bool Function() _isLinux;
+
+  final bool Function() _isMacOS;
+
+  final bool Function() _isWindows;
 
   String get _expectedPlatformName {
-    if (kIsWeb) return 'Web';
-    if (Platform.isAndroid) return 'Android';
-    if (Platform.isIOS) return 'iOS';
-    if (Platform.isLinux) return 'Linux';
-    if (Platform.isMacOS) return 'MacOS';
-    if (Platform.isWindows) return 'Windows';
+    if (_isWeb) return 'Web';
+    if (_isAndroid()) return 'Android';
+    if (_isIOS()) return 'iOS';
+    if (_isLinux()) return 'Linux';
+    if (_isMacOS()) return 'MacOS';
+    if (_isWindows()) return 'Windows';
     throw UnsupportedError('Unsupported platform ${Platform.operatingSystem}');
   }
 
@@ -36,3 +60,9 @@ class CheckPlatformName extends Action {
   @override
   String description() => 'Check platform name: "$_expectedPlatformName"';
 }
+
+bool _platformIsAndroid() => Platform.isAndroid;
+bool _platformIsIOS() => Platform.isIOS;
+bool _platformIsLinux() => Platform.isLinux;
+bool _platformIsMacOS() => Platform.isMacOS;
+bool _platformIsWindows() => Platform.isWindows;

src/my_plugin/my_plugin/example/actions/check_platform_name/test/src/check_platform_name_test.dart

@@ -42,11 +42,17 @@ void main() {
     });
 
     test('show correct description', () {
-      final action = CheckPlatformName();
+      final action = CheckPlatformName(
+        isAndroid: () => true,
+        isIOS: () => false,
+        isLinux: () => false,
+        isMacOS: () => false,
+        isWindows: () => false,
+      );
 
       expect(
         action.description(),
-        equals('Check platform name: "Hello World"'),
+        equals('Check platform name: "Android"'),
       );
     });
   });