add web impl, separate memory impl

.github/workflows/celest_core.yaml

@@ -151,3 +151,23 @@ jobs:
   #     - name: Test (Windows)
   #       working-directory: packages/celest_core/example
   #       run: flutter test -d windows integration_test/secure_storage_test.dart
+  test_web:
+    needs: analyze_and_format
+    runs-on: ubuntu-latest
+    timeout-minutes: 15
+    steps:
+      - name: Git Checkout
+        uses: actions/checkout@b4ffde65f46336ab88eb53be808477a3936bae11 # 4.1.1
+      - name: Setup Flutter
+        uses: subosito/flutter-action@62f096cacda5168a3bd7b95793373be14fa4fbaf # 2.13.0
+        with:
+          cache: true
+      - name: Get Packages
+        working-directory: packages/celest_core
+        run: dart pub get
+      - name: Test (Chrome, dart2js)
+        working-directory: packages/celest_core
+        run: dart test -p chrome
+      - name: Test (Chrome, dart2wasm)
+        working-directory: packages/celest_core
+        run: dart test -p chrome -c dart2wasm

packages/celest_core/lib/src/secure_storage/secure_storage.dart

@@ -9,3 +9,25 @@ abstract interface class SecureStorage {
   String? delete(String key);
   void clear();
 }
+
+/// An in-memory implementation of [SecureStorage].
+final class MemorySecureStorage implements SecureStorage {
+  MemorySecureStorage({
+    required this.scope,
+  });
+
+  final _storage = <String, String>{};
+  final String scope;
+
+  @override
+  void clear() => _storage.removeWhere((key, _) => key.startsWith('$scope/'));
+
+  @override
+  String? delete(String key) => _storage.remove('$scope/$key');
+
+  @override
+  String? read(String key) => _storage['$scope/$key'];
+
+  @override
+  String write(String key, String value) => _storage['$scope/$key'] = value;
+}

packages/celest_core/lib/src/secure_storage/secure_storage_platform.web.dart

@@ -1,15 +1,23 @@
 import 'package:celest_core/src/secure_storage/secure_storage.dart';
-import 'package:celest_core/src/secure_storage/secure_storage.stub.dart';
-import 'package:meta/meta.dart';
 
-abstract base class SecureStoragePlatform implements SecureStorage {
-  factory SecureStoragePlatform({
+final class SecureStoragePlatform implements SecureStorage {
+  SecureStoragePlatform({
     String? scope,
-  }) =>
-      SecureStoragePlatformStub(scope: scope ?? _defaultScope);
+  }) : _impl = MemorySecureStorage(scope: scope ?? _defaultScope);
+
+  final SecureStorage _impl;
 
   static const _defaultScope = 'dev.celest.celest';
 
-  @protected
-  const SecureStoragePlatform.base();
+  @override
+  void clear() => _impl.clear();
+
+  @override
+  String? delete(String key) => _impl.delete(key);
+
+  @override
+  String? read(String key) => _impl.read(key);
+
+  @override
+  String write(String key, String value) => _impl.write(key, value);
 }