public async Task AllDeliveredAsyncShouldReturnOnlyDeliveredPackages()
{
var db = DbInfrastructure.GetDatabase();
var mockUserManager = this.GetUserManagerMock();
mockUserManager
.Setup(m => m.FindByIdAsync(It.IsAny <string>()))
.Returns((string id) => db.Users.SingleOrDefaultAsync(u => u.Id == id));
var receiptService = new Mock <IReceiptService>().Object;
var packageService = new PackageService(db, receiptService, mockUserManager.Object);
await AddPackagesToDb(db);
var delivered = await packageService.AllDeliveredAsync();
delivered
.Should()
.HaveCount(20);
}