public async Task CreateDefaultFoldersForUser_FoldersCreated()
{
var db = CreateAndSeedDb();
var service = new FolderService(db);
var userId = Guid.NewGuid().ToString();
await service.CreateDefaultFoldersForUserAsync(userId);
Assert.Contains(db.Folders,
folder =>
folder.IsDefault &&
folder.Name == "Favorite Movies" &&
folder.OwnerId == userId);
Assert.Contains(db.Folders,
folder =>
folder.IsDefault &&
folder.Name == "Watch Later" &&
folder.OwnerId == userId);
}