stabilizaiton work - projects rework for maintenanceability and ui livening

src/__Libraries/__Tests/StellaOps.HybridLogicalClock.Tests/HlcTimestampTests.Compare.Advanced.cs

@@ -0,0 +1,57 @@
+using Xunit;
+
+namespace StellaOps.HybridLogicalClock.Tests;
+
+public partial class HlcTimestampTests
+{
+    [Fact]
+    public void CompareTo_SamePhysicalTimeAndCounter_SortsLexicographicallyByNodeId()
+    {
+        var nodeA = new HlcTimestamp
+        {
+            PhysicalTime = BasePhysicalTime,
+            NodeId = "node-a",
+            LogicalCounter = 0
+        };
+        var nodeB = new HlcTimestamp
+        {
+            PhysicalTime = BasePhysicalTime,
+            NodeId = "node-b",
+            LogicalCounter = 0
+        };
+
+        Assert.True(nodeA.CompareTo(nodeB) < 0);
+        Assert.True(nodeB.CompareTo(nodeA) > 0);
+    }
+
+    [Fact]
+    public void CompareTo_IdenticalTimestamps_ReturnsZero()
+    {
+        var ts1 = new HlcTimestamp
+        {
+            PhysicalTime = BasePhysicalTime,
+            NodeId = TestNodeId,
+            LogicalCounter = 42
+        };
+        var ts2 = new HlcTimestamp
+        {
+            PhysicalTime = BasePhysicalTime,
+            NodeId = TestNodeId,
+            LogicalCounter = 42
+        };
+
+        Assert.Equal(0, ts1.CompareTo(ts2));
+    }
+
+    [Fact]
+    public void CompareTo_TotalOrdering_IsTransitive()
+    {
+        var a = new HlcTimestamp { PhysicalTime = 100, NodeId = "node", LogicalCounter = 0 };
+        var b = new HlcTimestamp { PhysicalTime = 100, NodeId = "node", LogicalCounter = 1 };
+        var c = new HlcTimestamp { PhysicalTime = 100, NodeId = "node", LogicalCounter = 2 };
+
+        Assert.True(a < b);
+        Assert.True(b < c);
+        Assert.True(a < c);
+    }
+}