public void DeleteFilesShouldDeleteFilesFromMod()
{
var options = new DbContextOptionsBuilder <ApplicationDbContext>()
.UseInMemoryDatabase(databaseName: "DeleteFilesShouldDeleteFilesFromMod_DB")
.Options;
var dbContext = new ApplicationDbContext(options);
var modService = new ModService(dbContext);
var mod = new Mod();
dbContext.Mods.Add(mod);
dbContext.SaveChanges();
modService.AddFileUrl(mod.Id, null, null, null, 10000000);
modService.DeleteFiles(mod.Id);
Assert.Empty(mod.Files);
}