private Buyer CreateMonitoringBuyer(string buyerName, int numberInStock = 100, int numberToBuy = 10)
{
var buyer = new Buyer(buyerName, 100, numberToBuy);
buyer.Process(StockEvent.Price(200, numberInStock));
return(buyer);
}
public void Closed_buyer_does_not_react_to_further_messages()
{
Buyer buyer = CreateClosedBuyer(maximumPrice: 10);
StockCommand command = buyer.Process(StockEvent.Price(10, 10));
command.ShouldEqual(StockCommand.None());
buyer.Snapshot.State.ShouldEqual(BuyerState.Closed);
}
public void Buyer_attempts_to_buy_maximum_amount_available()
{
Buyer buyer = CreateJoiningBuyer(maximumPrice: 50, numberToBuy: 10);
StockCommand command = buyer.Process(StockEvent.Price(10, 5));
command.ShouldEqual(StockCommand.Buy(10, 5));
buyer.SnapshotShouldEqual(BuyerState.Buying, 10, 5, 0);
}
public void Buyer_buys_when_price_event_with_appropriate_price_arrives()
{
Buyer buyer = CreateJoiningBuyer(maximumPrice: 50);
StockCommand command = buyer.Process(StockEvent.Price(10, 5));
command.ShouldEqual(StockCommand.Buy(10, 1));
buyer.SnapshotShouldEqual(BuyerState.Buying, 10, 5, 0);
}
public void Buyer_does_not_buy_when_price_event_with_too_high_price_arrives()
{
var buyer = CreateJoiningBuyer(maximumPrice: 10);
StockCommand command = buyer.Process(StockEvent.Price(20, 5));
command.ShouldEqual(StockCommand.None());
buyer.SnapshotShouldEqual(BuyerState.Monitoring, 20, 5, 0);
}
public void Price_method_returns_a_price_event()
{
StockEvent stockEvent = StockEvent.Price(10, 15);
stockEvent.Type.ShouldEqual(StockEventType.Price);
stockEvent.CurrentPrice.ShouldEqual(10);
stockEvent.NumberInStock.ShouldEqual(15);
stockEvent.ToString().ShouldEqual("Event: PRICE; CurrentPrice: 10; NumberInStock: 15;");
}
