Avalonia/tests/Avalonia.ReactiveUI.UnitTests/Attributes.cs

using Avalonia.UnitTests;
using Xunit;

// Required to avoid InvalidOperationException sometimes thrown
// from Splat.MemoizingMRUCache.cs which is not thread-safe.
// Thrown when trying to access WhenActivated concurrently.
[assembly: CollectionBehavior(DisableTestParallelization = true)]
[assembly: VerifyEmptyDispatcherAfterTest]