public void ValidationForeignId_Should_ReturnTrue_When_AircraftFlightCrewExist() { A.CallTo(() => _fakeUnitOfWork.AircraftRepository.Get(null)).Returns(new List <Aircraft> { _departure.Aircraft }); A.CallTo(() => _fakeUnitOfWork.FlightRepository.Get(null)).Returns(new List <Flight> { _departure.Flight }); A.CallTo(() => _fakeUnitOfWork.CrewRepository.Get(null)).Returns(new List <Crew> { _departure.Crew }); var result = _departureService.ValidationForeignId(_departureDTO); Assert.IsTrue(result); }