public async Task GetByIdShouldReturnWhenCityDoesntExists()
{
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,
};
dbContext.Add(city);
await dbContext.SaveChangesAsync();
var cities = await service.GetByIdAsync <CityServiceModel>(3);
Assert.Null(cities);
}