public void ProcessBuilderDownloadCompleted_NotNullException_ShowsPopup()
{
//Arrange
var popupMock = PopupMock.Create().NotifyFailureMustBeCalled(Arg.IsAny<Exception>());
var vm = new MainViewModel {ThePopupFactory = popupMock.ThePopupFactory};
//Act
vm.ProcessBuilderDownloadCompleted(new Exception());
//Assert
popupMock.AssertNotifyFailureCalled();
}