✅ Async void method testing in xUnit

  internal async void HandleSubmit_Clicked(object? sender, EventArgs e)
  {
      try
      {     
          bool Valid = await ValidFormAsync(); 
          if (Valid)
          {
              _dataForm.OnSubmissionComplete(this, new SubmissionCompletedEventArgs(_dataForm.GetData(), _dataForm.Mode));
              SubmissionCompleted?.Invoke(this, new SubmissionCompletedEventArgs(_dataForm.GetData(), _dataForm.Mode));
          }
      }
      catch (Exception ex)
      {
          _logger.LogError("Submission Failed due to: {Exception}", ex.Message);
          _dataForm.ShowMessageBox("Submission Failed", "Error", MessageBoxButtons.OK, MessageBoxIcon.Error);
      }
  }

  protected virtual async Task<bool> ValidFormAsync()
  {
      _logger.LogCritical("ValidFormAsync is running in parent. Child must override it.");
      await Task.Delay(100); 
      return true;
  }

        [Fact]
        public void HandleSubmit_Clicked_RaisesSubmissionCompletedEvent()
        {
            // Arrange
            _presenterTemplate = new DataFormPresenterTemplate(_dataFormTemplate, _testLogger);

            bool eventRaised = false;
            void eventHandler(object? sender, SubmissionCompletedEventArgs args)
            {
                eventRaised = true;
            }
            _presenterTemplate.SubmissionCompleted += eventHandler;

            // Act
            _presenterTemplate.HandleSubmit_Clicked(null, EventArgs.Empty);

            // Assert
            Assert.True(eventRaised);

            // Cleanup
            _presenterTemplate.SubmissionCompleted -= eventHandler;
        }