Remove Jenkinsfile and add unit tests for various models including Address, Domain, Nameserver, Section, Session, Subnetwork, Tag, Vlan, and Vrf. Introduce mock classes for HTTP requests and cmdlet testing.

classlib.tests/Models/DomainTests.cs

@@ -0,0 +1,43 @@
+namespace PS.IPAM.Tests.Models;
+
+using FluentAssertions;
+using PS.IPAM;
+using Xunit;
+
+public class DomainTests
+{
+    [Fact]
+    public void Constructor_SetsAllProperties()
+    {
+        // Arrange
+        var id = 1;
+        var name = "Default";
+        var description = "Default L2 domain";
+        var sections = "1;2;3";
+
+        // Act
+        var domain = new Domain(id, name, description, sections);
+
+        // Assert
+        domain.Id.Should().Be(id);
+        domain.Name.Should().Be(name);
+        domain.Description.Should().Be(description);
+        domain.Sections.Should().Be(sections);
+    }
+
+    [Theory]
+    [InlineData("Default")]
+    [InlineData("Datacenter1")]
+    [InlineData("Branch_Office")]
+    public void ToString_ReturnsDomainName(string domainName)
+    {
+        // Arrange
+        var domain = new Domain(1, domainName, "", "");
+
+        // Act
+        var result = domain.ToString();
+
+        // Assert
+        result.Should().Be(domainName);
+    }
+}