[TestMethod]
   public void DoSomeWork_WhenWeDoSomeWork_ShouldReturnDone()
   {
      var service = new SyncService();

      const string expected = "Done";
      var actual = service.DoSomeWork();

      Assert.AreEqual(expected, actual);

   }

public ActionResult Index()
    {
       var syncService = new SyncService();

        return View((object)syncService.DoSomeWork());
    }

public class SyncService
    {
       public string DoSomeWork()
       {
          return SomeWork().GetAwaiter().GetResult();
       }

       private async Task<string> SomeWork()
       {
          var task1 = Task.Delay(1000);
          var task2 = Task.Delay(1000);

          await Task.WhenAll(task1, task2);

          return "Done";
       }
    }