xUnit v2 CollectionDefinitionAttribute FS0842: This attribute is not valid for use on this language element

[KarenTazayan]

As I see from the documentation, F# 9 introduces a new feature called 'Enforce attribute targets.' It breaks all my tests with xUnit v2, which were written in F# 8, when I try to update my projects to .NET 9 and F# 9.

type TestSiloConfigurator() =
    interface ISiloConfigurator with 
        member this.Configure(siloBuilder: ISiloBuilder) =
                siloBuilder.AddMemoryGrainStorage(PersistentStorageConfig.AzureSqlName) |> ignore
                siloBuilder.AddMemoryGrainStorage(PersistentStorageConfig.AzureStorageName) |> ignore

type ClusterFixture() =
    let mutable cluster = null

    do
        let builder = new TestClusterBuilder()
        builder.AddSiloBuilderConfigurator<TestSiloConfigurator>() |> ignore
        cluster <- builder.Build()
        cluster.Deploy()

    member this.Cluster with get() = cluster
    interface IDisposable with member this.Dispose() = cluster.Dispose()

type Starter(messageSink: IMessageSink) =
    inherit XunitTestFramework(messageSink)

[<CollectionDefinition(CurrentAssembly.ClusterFixture)>]
type ClusterCollection = 
    inherit ICollectionFixture<ClusterFixture>

[<assembly: Xunit.TestFramework(CurrentAssembly.TypeName, CurrentAssembly.Name)>]
()

What can I do in this situation?

[majocha]

Yeah xUnit have some annoyances. Collection definition should be just an emppty class.
Try this:

[<CollectionDefinition(CurrentAssembly.ClusterFixture)>]
type ClusterCollection() = 
    interface ICollectionFixture<ClusterFixture>

[KarenTazayan]

@majocha Thank you! Now I use it as a class, and it seems that the code below works

[<CollectionDefinition(CurrentAssembly.ClusterFixture)>]
type ClusterCollection() = 
    interface ICollectionFixture<ClusterFixture> with