public async Task GetAllAsyncWorksCorrectly() { var options = new DbContextOptionsBuilder <ApplicationDbContext>() .UseInMemoryDatabase(databaseName: Guid.NewGuid().ToString()).Options; var dbContext = new ApplicationDbContext(options); var addressesService = new Mock <IAddressesService>(); var repository = new EfDeletableEntityRepository <City>(dbContext); var service = new CitiesService(repository, addressesService.Object); var city = new City() { Id = 1, CountryId = 1, }; var city2 = new City() { Id = 2, CountryId = 1, }; var city3 = new City() { Id = 3, CountryId = 2, }; dbContext.Add(city); dbContext.Add(city2); dbContext.Add(city3); await dbContext.SaveChangesAsync(); var result = await service.GetAllAsync <CityServiceModel>(); Assert.Equal(3, result.Count()); }