stabilizaiton work - projects rework for maintenanceability and ui livening

src/__Libraries/StellaOps.HybridLogicalClock.Tests/InMemoryHlcStateStoreTests.Save.cs

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+// <copyright file="InMemoryHlcStateStoreTests.Save.cs" company="StellaOps">
+// Copyright (c) StellaOps. Licensed under BUSL-1.1.
+// </copyright>
+using FluentAssertions;
+using System;
+using System.Threading;
+using Xunit;
+
+namespace StellaOps.HybridLogicalClock.Tests;
+
+public sealed partial class InMemoryHlcStateStoreTests
+{
+    [Fact]
+    public async Task SaveAsync_ThenLoadAsync_ReturnsStateAsync()
+    {
+        var store = new InMemoryHlcStateStore();
+        var timestamp = CreateTimestamp("node1", 1000, 5);
+
+        await store.SaveAsync(timestamp, CancellationToken.None);
+        var result = await store.LoadAsync("node1", CancellationToken.None);
+
+        result.Should().Be(timestamp);
+    }
+
+    [Fact]
+    public async Task SaveAsync_GreaterTimestamp_UpdatesAsync()
+    {
+        var store = new InMemoryHlcStateStore();
+        var first = CreateTimestamp("node1", 1000, 5);
+        var second = CreateTimestamp("node1", 1000, 10);
+
+        await store.SaveAsync(first, CancellationToken.None);
+        await store.SaveAsync(second, CancellationToken.None);
+        var result = await store.LoadAsync("node1", CancellationToken.None);
+
+        result.Should().Be(second);
+    }
+
+    [Fact]
+    public async Task SaveAsync_SmallerTimestamp_DoesNotUpdateAsync()
+    {
+        var store = new InMemoryHlcStateStore();
+        var first = CreateTimestamp("node1", 1000, 10);
+        var second = CreateTimestamp("node1", 1000, 5);
+
+        await store.SaveAsync(first, CancellationToken.None);
+        await store.SaveAsync(second, CancellationToken.None);
+        var result = await store.LoadAsync("node1", CancellationToken.None);
+
+        result.Should().Be(first);
+    }
+
+    [Fact]
+    public async Task SaveAsync_Cancelled_ThrowsOperationCanceledExceptionAsync()
+    {
+        var store = new InMemoryHlcStateStore();
+        using var cts = new CancellationTokenSource();
+        cts.Cancel();
+
+        var act = () => store.SaveAsync(CreateTimestamp("node1", 1000, 1), cts.Token);
+
+        await act.Should().ThrowAsync<OperationCanceledException>();
+    }
+}