Increase Blazor hub message limit

RpgRoller.Tests/Api/FrontendHostTests.cs

@@ -1,3 +1,6 @@
+using Microsoft.AspNetCore.SignalR;
+using Microsoft.Extensions.Options;
+
 namespace RpgRoller.Tests;
 
 public sealed class FrontendHostTests : ApiTestBase
@@ -18,4 +21,24 @@ public sealed class FrontendHostTests : ApiTestBase
         Assert.Contains("_framework/blazor.web.js", html);
         Assert.Contains("Connecting...", html);
     }
-}
+
+    [Fact]
+    public void BlazorHub_AllowsLargerInteropPayloads()
+    {
+        using var factory = CreateFactory();
+        var componentHubType = Type.GetType("Microsoft.AspNetCore.Components.Server.ComponentHub, Microsoft.AspNetCore.Components.Server");
+        Assert.NotNull(componentHubType);
+
+        var hubOptionsType = typeof(HubOptions<>).MakeGenericType(componentHubType);
+        var optionsType = typeof(IOptions<>).MakeGenericType(hubOptionsType);
+        var options = factory.Services.GetService(optionsType);
+        Assert.NotNull(options);
+
+        var value = optionsType.GetProperty("Value")!.GetValue(options);
+        Assert.NotNull(value);
+
+        var maximumReceiveMessageSize = (long?)hubOptionsType.GetProperty("MaximumReceiveMessageSize")!.GetValue(value);
+
+        Assert.Equal(256 * 1024, maximumReceiveMessageSize);
+    }
+}