public async Task DeleteByCityIdWorksCorrectly() { var options = new DbContextOptionsBuilder<ApplicationDbContext>() .UseInMemoryDatabase(databaseName: Guid.NewGuid().ToString()).Options; var dbContext = new ApplicationDbContext(options); var repository = new EfDeletableEntityRepository<Address>(dbContext); var address = new Address() { Id = 1, CityId = 1, }; var addressTwo = new Address() { Id = 2, CityId = 1, }; dbContext.Add(address); dbContext.Add(addressTwo); await dbContext.SaveChangesAsync(); var service = new AddressesService(repository); await service.DeleteByCityIdAsync(1); var addressesInDbCount = repository.All().ToList().Count(); Assert.Equal(0, addressesInDbCount); }