public async Task DeleteByIdAsync_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 countryId = await countriesRepository.All()
.Where(c => c.Name == "Bulgaria")
.Select(c => c.Id)
.FirstOrDefaultAsync();
var result = await countriesService.DeleteByIdAsync(countryId);
Assert.True(result > 0, ErrorMessage);
}