MudTab Error

ViewerBodyTests.cs

using Bunit;
using Microsoft.Extensions.DependencyInjection;
using Microsoft.VisualStudio.TestTools.UnitTesting;
using MudBlazor.Services;
using System;
using System.Threading.Tasks;
[TestClass()]
public class ViewerBodyTests : BunitTestContext
{

	[TestInitialize]
  public void Setup()
  {
      TestContext = new Bunit.TestContext();
      Services.AddMudServices();
      JSInterop.Mode = JSRuntimeMode.Loose;
  }
        
	[TestMethod()]
	public async Task MudTabs_WhenRendering_GeneratesExpectedPropertyMarkup()
	{
		//Next line throws a System.NullReferenceException:
		//		Object reference not set to an instance of an object.
		var tabs = RenderComponent<MudBlazor.MudTabs>();
		Assert.IsNotNull(tabs);
	}
}