public void GetGalleryUrlsByIdShouldReturnTheImagesOfMod()
{
var options = new DbContextOptionsBuilder <ApplicationDbContext>()
.UseInMemoryDatabase(databaseName: "AddGalleryUrlsShouldAddMultipleImagesToMod_DB")
.Options;
var dbContext = new ApplicationDbContext(options);
var modService = new ModService(dbContext);
var urls = new List <string>();
urls.Add("qqq");
urls.Add("222");
urls.Add("rrr");
var mod = new Mod();
dbContext.Mods.Add(mod);
dbContext.SaveChanges();
modService.AddGalleryUrls(mod.Id, urls);
var gallery = modService.GetGalleryUrlsById(mod.Id);
Assert.Equal(3, gallery.Count);
}