public void ReplaceSegment_04()
{
// arrange:
ILeg leg = MockRepository.GenerateStrictMock <ILeg>();
Itinerary empty = new Itinerary();
IItinerary tested = empty.Append(leg);
// act:
Assert.Throws <ArgumentNullException>(delegate { tested.ReplaceSegment(null); });
// assert:
leg.VerifyAllExpectations();
}