public async Task DeleteAllByIdAsync_ShouldReturnCorrectResult()
{
MapperInitializer.InitializeMapper();
var context = ApplicationDbContextInMemoryFactory.InitializeContext();
var countriesRepository = new EfDeletableEntityRepository <Country>(context);
var countriesService = new CountriesService(countriesRepository);
var seeder = new DbContextTestsSeeder();
await seeder.SeedCountriesAsync(context);
var expectedIds = await countriesRepository.All()
.Select(c => c.Id)
.ToListAsync();
var actulaIds = await countriesService.DeleteAllByIdAsync(expectedIds);
var areEquivalent = (expectedIds.Count == actulaIds.ToList().Count) && !expectedIds.Except(actulaIds.ToList()).Any();
Assert.True(areEquivalent, ErrorMessage);
}