Test OnBeforeLoadAsync

Author: JimBobSquarePants

tests/ImageSharp.Web.Tests/TestUtilities/TestServerFixture.cs

@@ -7,6 +7,7 @@
 using Microsoft.AspNetCore.TestHost;
 using Microsoft.Extensions.Configuration;
 using Microsoft.Extensions.DependencyInjection;
+using SixLabors.ImageSharp.Formats;
 using SixLabors.ImageSharp.Web.DependencyInjection;
 using SixLabors.ImageSharp.Web.Middleware;
 
@@ -67,6 +68,16 @@ protected void ConfigureServices(IServiceCollection services)
                 return onParseCommandsAsync.Invoke(context);
             };
 
+            Func<HttpContext, DecoderOptions, Task> onBeforeLoadAsync = options.OnBeforeLoadAsync;
+
+            options.OnBeforeLoadAsync = (context, decoderOptions) =>
+            {
+                Assert.NotNull(context);
+                Assert.NotNull(decoderOptions);
+
+                return onBeforeLoadAsync.Invoke(context, decoderOptions);
+            };
+
             Func<ImageProcessingContext, Task> onProcessedAsync = options.OnProcessedAsync;
 
             options.OnProcessedAsync = context =>