Refactored subnet object methods and enhanced related documentation

classlib.tests/TestCollections.cs

@@ -0,0 +1,32 @@
+namespace PS.IPAM.Tests;
+
+using Xunit;
+
+/// <summary>
+/// Collection definition for tests that share static state (SessionManager, RequestHelper.TestHttpHandler).
+/// Tests in this collection will run sequentially, not in parallel.
+/// </summary>
+[CollectionDefinition("Sequential")]
+public class SequentialCollection : ICollectionFixture<SequentialTestFixture>
+{
+}
+
+/// <summary>
+/// Fixture for sequential test collection.
+/// </summary>
+public class SequentialTestFixture : IDisposable
+{
+    public SequentialTestFixture()
+    {
+        // Clean up before tests
+        PS.IPAM.Helpers.SessionManager.CloseSession();
+        PS.IPAM.Helpers.RequestHelper.TestHttpHandler = null;
+    }
+
+    public void Dispose()
+    {
+        // Clean up after tests
+        PS.IPAM.Helpers.SessionManager.CloseSession();
+        PS.IPAM.Helpers.RequestHelper.TestHttpHandler = null;
+    }
+}