public void GetAllVacancies_GetSomeList_ShouldRepositoryCallOnce_ShouldReturnNotNullList() { VacancyRepository.Setup(x => x.GetAll()).Returns(new List <Vacancy>() { }); //act & assert NUnit.Framework.Assert.IsNotNull(vacService.GetAllVacancy()); VacancyRepository.Verify(x => x.GetAll()); }