stabilizaiton work - projects rework for maintenanceability and ui livening

src/__Libraries/__Tests/StellaOps.TestKit.Tests/LongevityTests.StabilityMetrics.cs

@@ -0,0 +1,55 @@
+using FluentAssertions;
+using StellaOps.TestKit.Longevity;
+using Xunit;
+
+namespace StellaOps.TestKit.Tests;
+
+public sealed partial class LongevityTests
+{
+    [Fact]
+    public void StabilityMetrics_CaptureBaseline_SetsBaseline()
+    {
+        var metrics = new StabilityMetrics();
+
+        metrics.CaptureBaseline();
+
+        metrics.MemoryBaseline.Should().BeGreaterThan(0);
+        metrics.Snapshots.Should().HaveCount(1);
+    }
+
+    [Fact]
+    public void StabilityMetrics_CaptureSnapshot_AddsSnapshot()
+    {
+        var metrics = new StabilityMetrics();
+        metrics.CaptureBaseline();
+
+        metrics.CaptureSnapshot();
+        metrics.CaptureSnapshot();
+
+        metrics.Snapshots.Should().HaveCount(3);
+    }
+
+    [Fact]
+    public void StabilityMetrics_RecordCounter_StoresValue()
+    {
+        var metrics = new StabilityMetrics();
+        metrics.CaptureBaseline();
+
+        metrics.RecordCounter("requests_total", 100);
+
+        metrics.CounterValues.Should().ContainKey("requests_total");
+        metrics.CounterValues["requests_total"].Should().Be(100);
+    }
+
+    [Fact]
+    public void StabilityMetrics_RecordConnectionPool_StoresValues()
+    {
+        var metrics = new StabilityMetrics();
+        metrics.CaptureBaseline();
+
+        metrics.RecordConnectionPool(active: 5, leaked: 1);
+
+        metrics.ConnectionPoolActive.Should().Be(5);
+        metrics.ConnectionPoolLeaked.Should().Be(1);
+    }
+}