[Fact] // 2. async Task<IEnumerable<CityListServiceModel>> AllCitiesByCountryAsync(int id)
public async void AllCitiesByCountryAsync_ShouldReturnModelCollectionOfAllByCountry()
{
// Arrange
var country = CountryCreator.Create();
var city = CityCreator.Create(country.Id);
var city2 = CityCreator.Create(country.Id);
var city3 = CityCreator.Create(country.Id);
var country2 = CountryCreator.Create();
var city4 = CityCreator.Create(country2.Id);
var city5 = CityCreator.Create(country2.Id);
await this.Context.Countries.AddRangeAsync(country, country2);
await this.Context.Cities.AddRangeAsync(city, city2, city3, city4, city5);
await this.Context.SaveChangesAsync();
var service = new CityService(this.Context);
// Act
var result = await service.AllCitiesByCountryAsync(country2.Id);
// Assert
result.Should().AllBeOfType <CityListServiceModel>();
result.Should().HaveCount(2);
}