feat: add alot

test/helpers/memory_secure_storage.dart

@@ -0,0 +1,49 @@
+import 'package:flutter_secure_storage/flutter_secure_storage.dart';
+import 'package:flutter_test/flutter_test.dart';
+
+/// An in-memory stand-in for the platform keystore.
+class MemorySecureStorage extends Fake implements FlutterSecureStorage {
+  final Map<String, String> values = {};
+
+  @override
+  Future<String?> read({
+    required String key,
+    AppleOptions? iOptions,
+    AndroidOptions? aOptions,
+    LinuxOptions? lOptions,
+    WebOptions? webOptions,
+    AppleOptions? mOptions,
+    WindowsOptions? wOptions,
+  }) async => values[key];
+
+  @override
+  Future<void> write({
+    required String key,
+    required String? value,
+    AppleOptions? iOptions,
+    AndroidOptions? aOptions,
+    LinuxOptions? lOptions,
+    WebOptions? webOptions,
+    AppleOptions? mOptions,
+    WindowsOptions? wOptions,
+  }) async {
+    if (value == null) {
+      values.remove(key);
+    } else {
+      values[key] = value;
+    }
+  }
+
+  @override
+  Future<void> delete({
+    required String key,
+    AppleOptions? iOptions,
+    AndroidOptions? aOptions,
+    LinuxOptions? lOptions,
+    WebOptions? webOptions,
+    AppleOptions? mOptions,
+    WindowsOptions? wOptions,
+  }) async {
+    values.remove(key);
+  }
+}