public void GetEntryByBadId_ShouldReturn_Null() { // Arrange DepartureEntity departureEntity = new DepartureEntityBuilder() .WithId(Guid.NewGuid().ToString()) .Build(); var id = Guid.NewGuid().ToString(); _departureRepository.Setup(r => r.List(dr => dr.IdEntry == id)).Returns(new List <DepartureEntity>()); var entryService = new DepartureService(_departureRepository.Object, _entryRepository.Object, _rateService.Object, _cellService.Object); // Act DepartureEntity result = entryService.GetDepartureByEntryId(id); // Assert Assert.IsNull(result); }