public void ReturnOnceTest()
{
IWfActivity activityD = ReturnExecutorTestHelper.PrepareAndMoveToSpecialActivity();
Assert.AreEqual("D", activityD.Descriptor.Key);
activityD.Process.OutputMainStream();
activityD.Process.OutputEveryActivities();
activityD.Process.ValidateMainStreamActivities("A", "B", "C", "D", "F");
ReturnExecutorTestHelper.ExecuteReturnOperation(activityD, "A");
IWfActivity returnedActivity = activityD.Process.CurrentActivity;
Assert.AreEqual("A", returnedActivity.Descriptor.AssociatedActivityKey);
Assert.AreEqual(activityD.ID, returnedActivity.CreatorInstanceID);
ReturnExecutorTestHelper.ValidateBRelativeActivityOutTransitions(activityD.Process.CurrentActivity);
activityD.Process.OutputMainStream();
activityD.Process.OutputEveryActivities();
activityD.Process.ValidateMainStreamActivities("A", "B", "C", "D", "F");
}