first commit

services/csharp/tests/SequenceAuth.Example.Tests/InMemorySequenceStore.cs

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+using System.Collections.Concurrent;
+using System.Linq;
+using System.Threading.Tasks;
+using SequenceAuth.Lib;
+
+namespace SequenceAuth.Example.Tests;
+
+public class InMemorySequenceStore : ISequenceStore
+{
+    private readonly ConcurrentDictionary<string, SequenceData> _store = new();
+
+    public Task<Option<SequenceData>> GetSequenceAsync(string sequenceId)
+    {
+        if (_store.TryGetValue(sequenceId, out var data))
+        {
+            return Task.FromResult(Option<SequenceData>.Some(data));
+        }
+        return Task.FromResult(Option<SequenceData>.None());
+    }
+
+    public Task<StoreOutcome> SaveSequenceAsync(string sequenceId, SequenceData data)
+    {
+        _store[sequenceId] = data;
+        return Task.FromResult(StoreOutcome.Success);
+    }
+
+    public Task<StoreOutcome> InvalidateUserSessionsAsync(string userId)
+    {
+        var keysToRemove = _store.Where(kvp => kvp.Value.UserId == userId).Select(kvp => kvp.Key).ToList();
+        foreach (var key in keysToRemove)
+        {
+            _store.TryRemove(key, out _);
+        }
+        return Task.FromResult(StoreOutcome.Success);
+    }
+}