Add MockHttpMessageHandlerFactory

Author: devlead

src/Devlead.Testing.MockHttp/IServiceCollectionExtensions.cs

@@ -1,4 +1,5 @@
 using Microsoft.Extensions.DependencyInjection;
+using System.Collections.Concurrent;
 using System.Diagnostics.CodeAnalysis;
 using VerifyTests.Http;
 
@@ -20,10 +21,19 @@ static MockHttpClient CreateClient(IServiceProvider provider)
             return client;
         }
 
+        static MockHttpMessageHandlerFactory CreateHttpMessageHandlerFactory(IServiceProvider provider)
+            => new(Routes<T>.GetResponseBuilder(provider));
+
         return services
-            .AddSingleton<HttpClient>(CreateClient)
+            .AddTransient<HttpClient>(provider => provider.GetRequiredService<MockHttpClient>())
+            .AddTransient(CreateClient)
+            .AddSingleton(provider => new MockHttpClientFactory(() => CreateClient(provider)))
             .AddSingleton<IHttpClientFactory>(
-             provider => new MockHttpClientFactory(()=>CreateClient(provider))
+                provider => provider.GetRequiredService<MockHttpClientFactory>()
+            )
+            .AddSingleton(CreateHttpMessageHandlerFactory)
+            .AddSingleton<IHttpMessageHandlerFactory>(
+                provider => provider.GetRequiredService<MockHttpMessageHandlerFactory>()
             );
     }
 

src/Devlead.Testing.MockHttp/MockHttpMessageHandler.cs

@@ -0,0 +1,9 @@
+namespace Devlead.Testing.MockHttp;
+
+public class MockHttpMessageHandler(Func<HttpRequestMessage, HttpResponseMessage> responseBuilder) : HttpMessageHandler
+{
+    protected override Task<HttpResponseMessage> SendAsync(HttpRequestMessage request, CancellationToken cancellationToken)
+        => Task.FromResult(
+                responseBuilder(request)
+            );
+}

src/Devlead.Testing.MockHttp/MockHttpMessageHandlerFactory.cs

@@ -0,0 +1,14 @@
+using System.Collections.Concurrent;
+
+namespace Devlead.Testing.MockHttp;
+
+public class MockHttpMessageHandlerFactory(Func<HttpRequestMessage, HttpResponseMessage> responseBuilder) : IHttpMessageHandlerFactory
+{
+    private ConcurrentDictionary<string, MockHttpMessageHandler> HttpMessageHandlers { get; } = [];
+
+    public HttpMessageHandler CreateHandler(string name)
+        => HttpMessageHandlers.GetOrAdd(
+            name,
+            _ => new(responseBuilder)
+            );
+}