public void SubscriptionsService_UpdatePurchase_calls_Update_method()
{
var purchase = new PurchaseDTO
{
Id = 7,
IsPaid = false,
UserId = 12
};
bool isUpdateCalled = false;
var mock = new Mock <IUnitOfWork>();
mock.Setup(a => a.Purchases.Update(It.Is <Purchase>(p =>
(p.Id == purchase.Id) &&
(p.IsPaid == purchase.IsPaid) &&
(p.UserId == purchase.UserId)))).Callback(() => isUpdateCalled = true);
service = new SubscriptionsService(mock.Object);
service.UpdatePurchase(purchase);
Assert.IsTrue(isUpdateCalled);
}