public void SetUp()
{
taskContext = new JoinableTaskContext();
closeDialogSource = new TaskCompletionSource <bool>();
mockProgressDialog = Substitute.For <IProgressDialog>();
mockProgressDialog.ShowModal()
.Returns(x => taskContext.Factory.Run(() => closeDialogSource.Task));
mockProgressDialog.When(x => x.Complete())
.Do(x => closeDialogSource.TrySetResult(true));
mockProgressDialogFactory = Substitute.For <ProgressDialog.Factory>();
mockProgressDialogFactory.Create(Title, Text).Returns(mockProgressDialog);
taskFactory = new CancelableTask.Factory(taskContext, mockProgressDialogFactory, Title,
DialogDelay, ProgressPeriod);
}