CLI and Publish Tests

IGP.Calculator.Cli/Services/NullStorageService.cs

@@ -0,0 +1,25 @@
+using Services;
+
+namespace IGP.Calculator.Cli.Services;
+
+public class NullStorageService : IStorageService
+{
+    private readonly Dictionary<string, object?> _store = new();
+
+    public void Subscribe(Action action) { }
+    public void Unsubscribe(Action action) { }
+
+    public T GetValue<T>(string forKey)
+    {
+        if (_store.TryGetValue(forKey, out var value) && value is T typed)
+            return typed;
+        return default!;
+    }
+
+    public void SetValue<T>(string key, T value)
+    {
+        _store[key] = value;
+    }
+
+    public Task Load() => Task.CompletedTask;
+}