feat: Add IApiToolkitClientFactory interface and implementation

- Added IApiToolkitClientFactory interface to provide an abstraction for creating HttpClient instances with specific ATOptions.
- Implemented ApiToolkitClientFactory class, which leverages HttpClientFactory for centralized management of HttpClient instances.
-Added tests For The IApiToolKitCLientFactory

ApiToolkitTests.cs

@@ -10,7 +10,9 @@
 using Microsoft.AspNetCore.Hosting;
 using Microsoft.Extensions.Hosting;
 using Microsoft.AspNetCore.Builder;
-
+using Moq;
+using System.Net.Http;
+using Microsoft.Extensions.DependencyInjection;
 public class RedactTests
 {
     [Test]
@@ -208,3 +210,74 @@ public async Task MiddlewareTest_ReturnsNotFoundForRequest()
     }
 }
 
+
+    public class ApiToolkitClientFactoryTests
+    {
+        private Mock<IHttpClientFactory> _httpClientFactoryMock;
+        private Mock<IServiceProvider> _serviceProviderMock;
+        private Mock<ObservingHandler> _observingHandlerMock;
+        private IApiToolkitClientFactory _apiToolkitClientFactory;
+
+        [SetUp]
+        public void SetUp()
+        {
+            _httpClientFactoryMock = new Mock<IHttpClientFactory>();
+            _serviceProviderMock = new Mock<IServiceProvider>();
+            _observingHandlerMock = new Mock<ObservingHandler>();
+
+            // Set up the service provider to return the observing handler mock
+            _serviceProviderMock
+                .Setup(sp => sp.GetService(typeof(ObservingHandler)))
+                .Returns(_observingHandlerMock.Object);
+
+            // Initialize the ApiToolkitClientFactory with mocks
+            _apiToolkitClientFactory = new ApiToolkitClientFactory(_httpClientFactoryMock.Object, _serviceProviderMock.Object);
+        }
+
+        [Test]
+        public void CreateClient_ShouldReturnHttpClient_WithConfiguredHandler()
+        {
+            // Arrange
+            var options = new ATOptions
+            {
+                PathWildCard = "/posts/{id}",
+                RedactHeaders = new List<string> { "User-Agent" },
+                RedactRequestBody =  new List<string> { "$.user.password" },
+                RedactResponseBody =  new List<string> { "$.user.data.email" }
+            };
+
+            // Act
+            var client = _apiToolkitClientFactory.CreateClient(options);
+
+            // Assert
+            Assert.NotNull(client);
+            _observingHandlerMock.Verify(h => h.SetOptions(options), Times.Once);
+        }
+
+        [Test]
+        public void CreateClient_ShouldUseObservingHandler_FromServiceProvider()
+        {
+            // Act
+            var client = _apiToolkitClientFactory.CreateClient(new ATOptions());
+
+            // Assert
+            _serviceProviderMock.Verify(sp => sp.GetService(typeof(ObservingHandler)), Times.Once);
+        }
+
+        [Test]
+        public void CreateClient_ShouldThrowException_WhenHandlerNotRegistered()
+        {
+            // Arrange
+            var invalidServiceProvider = new Mock<IServiceProvider>();
+            invalidServiceProvider.Setup(sp => sp.GetService(typeof(ObservingHandler)))
+                                  .Returns(null); // Simulate missing handler registration
+
+            var factory = new ApiToolkitClientFactory(_httpClientFactoryMock.Object, invalidServiceProvider.Object);
+
+            // Act & Assert
+            Assert.Throws<NullReferenceException>(() => factory.CreateClient(new ATOptions()));
+        }
+    }
+
+
+

apitoolkit-dotnet.csproj

@@ -28,6 +28,7 @@
     <PackageReference Include="Microsoft.AspNetCore.TestHost" Version="7.0.5" />
     <!-- Deprecated -->
     <PackageReference Include="Microsoft.AspNetCore.Hosting" Version="2.2.7" />
+    <PackageReference Include="Moq" Version="4.20.70" />
     <PackageReference Include="Newtonsoft.Json" Version="13.0.3" />
     <PackageReference Include="Microsoft.NET.Test.Sdk" Version="17.6.2" />
     <PackageReference Include="NUnit" Version="3.13.3" />