Virtualize test error with .NET 11 RC1

[vnbaaij]

We are using bUnit in the Microsoft Fluent UI Blazor library. We are seeing testing errors with .NET 11 RC1 while testing our DataGrid that uses Virtualize.

This is the analysis from the Copilot Debugger:

Root cause is confirmed.

• The exception is not caused by your itemsProvider lambda or RefreshItems binding in FluentDataGrid_ItemsProvider.
• It is thrown inside bUnit’s Virtualize JS interop handler during render initialization.
  Evidence from the debugged sources:
• bUnit invokes OnSpacerBeforeVisible with 3 arguments:
  • VirtualizeJSRuntimeInvocationHandler.cs:44-45
  • object[] parameters = new object[3] { 0f, 0f, 1E+09f };
• In .NET 11, ASP.NET Core’s VirtualizeJsInterop.OnSpacerBeforeVisible expects 4 parameters:
  • VirtualizeJsInterop.cs:34
  • OnSpacerBeforeVisible(float spacerSize, float spacerSeparation, float containerSize, int reason)

[egil]

Hi @vnbaaij

This makes sense. The Virtualize component relies heavily on JSInterop, and bUnit does not run any JavaScript, so we provide a mock for the JSInterop interactions out of the box. However, the box has changed it seems, so we need to update it for the dotnet 11 release.

Since copilot already have its fingers down in the dirt, you should feel free to submit a PR to us that fixes this for dotnet 11.

[vnbaaij]

Sure, i can give it a shot.

As I am not familiar with this codebase and repo yet (just an end-user until now), is there a document that describes the process you (want me to) use for this? And which branch should I use?

See #1919 for the result