Trading mod: shops as data and the trade window
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namespace Cthangover.Mods.Trading.Tests
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{
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using System.Collections.Generic;
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using System.Text.Json;
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using Cthangover.Core.Mods.Testing;
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/// <summary>A shop is hand-written JSON: it must survive a round trip and its lookups must skip broken lines.</summary>
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public class ShopInfoTests
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{
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[ModTest("shop/json_round_trip")]
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static void JsonRoundTrip(ModTestContext ctx)
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{
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var original = new ShopInfo
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{
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ID = "rpg_demo/village_merchant",
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Name = "rpg_demo/shop/village_merchant",
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Currency = "money/shell",
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Sells = new List<ShopOffer> { new() { Item = "rpg_demo/elixir", Price = 10 } },
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Buys = new List<ShopOffer> { new() { Item = "rpg_demo/stones", Price = 2 } },
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};
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var restored = JsonSerializer.Deserialize<ShopInfo>(JsonSerializer.Serialize(original));
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ModAssert.Equal(original.ID, restored.ID, "Id");
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ModAssert.Equal(original.Name, restored.Name, "Name");
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ModAssert.Equal(original.Currency, restored.Currency, "Currency");
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ModAssert.Equal(1, restored.Sells.Count, "Sells");
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ModAssert.Equal("rpg_demo/elixir", restored.Sells[0].Item, "Sells item");
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ModAssert.Equal(10, restored.Sells[0].Price, "Sells price");
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ModAssert.Equal(1, restored.Buys.Count, "Buys");
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ModAssert.Equal("rpg_demo/stones", restored.Buys[0].Item, "Buys item");
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ModAssert.Equal(2, restored.Buys[0].Price, "Buys price");
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}
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[ModTest("shop/defaults_from_minimal_json")]
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static void DefaultsFromMinimalJson(ModTestContext ctx)
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{
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var shop = JsonSerializer.Deserialize<ShopInfo>("{\"Id\":\"bare\"}");
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ModAssert.Equal("bare", shop.ID, "Id");
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ModAssert.Equal(ShopInfo.DefaultCurrency, shop.Currency, "default currency");
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ModAssert.Equal(0, shop.Sells.Count, "no goods");
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ModAssert.Null(shop.FindBuy("anything"), "buys nothing");
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}
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[ModTest("shop/find_skips_broken_offers")]
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static void FindSkipsBrokenOffers(ModTestContext ctx)
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{
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var shop = new ShopInfo
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{
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ID = "s",
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Sells = new List<ShopOffer> { null, new() { Item = "a", Price = 0 }, new() { Item = "a", Price = 4 } },
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Buys = null,
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};
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ModAssert.Equal(4, shop.FindSell("a")?.Price ?? -1, "the first offer with a real price wins");
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ModAssert.Null(shop.FindSell("b"), "unknown item");
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ModAssert.Null(shop.FindSell(null), "null id");
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ModAssert.Null(shop.FindBuy("a"), "null list buys nothing");
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}
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}
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}
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@@ -0,0 +1,107 @@
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namespace Cthangover.Mods.Trading.Tests
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{
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using System.Collections.Generic;
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using System.Linq;
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using Cthangover.Core.Items;
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using Cthangover.Core.Mods.Resolvers;
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using Cthangover.Core.Mods.Testing;
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/// <summary>
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/// Deals are all or nothing: a refused buy or sell must leave both the money
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/// and the goods exactly as they were.
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/// </summary>
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public class TradeLedgerTests
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{
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private static string Goods() =>
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Entities.Collect<ItemInfo>().Keys.First(k => k != ShopInfo.DefaultCurrency);
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private static ShopInfo Shop(string goods) => new()
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{
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ID = "test_shop",
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Sells = new List<ShopOffer> { new() { Item = goods, Price = 3 } },
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Buys = new List<ShopOffer> { new() { Item = goods, Price = 2 } },
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};
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[ModTest("ledger/buy_takes_money_and_adds_goods")]
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static void BuyTakesMoneyAndAddsGoods(ModTestContext ctx)
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{
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var goods = Goods();
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var shop = Shop(goods);
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var inventory = new Inventory();
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inventory.Add(shop.Currency, 10);
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var before = inventory.CheckCount(goods);
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ModAssert.True(TradeLedger.Buy(inventory, shop, goods, 3), "affordable buy succeeds");
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ModAssert.Equal(1, inventory.CheckCount(shop.Currency), "10 - 3 x 3 coins left");
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ModAssert.Equal(before + 3, inventory.CheckCount(goods), "three units bought");
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ModAssert.Equal(1, TradeLedger.Money(inventory, shop), "money reads the currency stack");
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}
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[ModTest("ledger/buy_refused_changes_nothing")]
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static void BuyRefusedChangesNothing(ModTestContext ctx)
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{
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var goods = Goods();
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var shop = Shop(goods);
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var inventory = new Inventory();
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inventory.Add(shop.Currency, 5);
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var before = inventory.CheckCount(goods);
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ModAssert.False(TradeLedger.Buy(inventory, shop, goods, 2), "6 coins needed, 5 owned");
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ModAssert.False(TradeLedger.Buy(inventory, shop, goods, 0), "zero units");
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ModAssert.False(TradeLedger.Buy(inventory, shop, goods, -1), "negative units");
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ModAssert.False(TradeLedger.Buy(inventory, shop, "no/such_item", 1), "not on sale");
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ModAssert.Equal(5, inventory.CheckCount(shop.Currency), "money untouched");
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ModAssert.Equal(before, inventory.CheckCount(goods), "goods untouched");
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}
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[ModTest("ledger/sell_pays_and_removes_goods")]
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static void SellPaysAndRemovesGoods(ModTestContext ctx)
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{
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var goods = Goods();
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var shop = Shop(goods);
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var inventory = new Inventory();
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inventory.Add(goods, 4);
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var before = inventory.CheckCount(goods);
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var money = inventory.CheckCount(shop.Currency);
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ModAssert.True(TradeLedger.Sell(inventory, shop, goods, 3), "owned units sell");
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ModAssert.Equal(money + 6, inventory.CheckCount(shop.Currency), "3 x 2 coins paid");
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ModAssert.Equal(before - 3, inventory.CheckCount(goods), "three units gone");
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}
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[ModTest("ledger/sell_refused_changes_nothing")]
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static void SellRefusedChangesNothing(ModTestContext ctx)
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{
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var goods = Goods();
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var shop = Shop(goods);
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var inventory = new Inventory();
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inventory.Add(goods, 2);
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inventory.Add(shop.Currency, 7);
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var before = inventory.CheckCount(goods);
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shop.Buys.Add(new ShopOffer { Item = shop.Currency, Price = 1 });
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ModAssert.False(TradeLedger.Sell(inventory, shop, goods, before + 1), "more than owned");
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ModAssert.False(TradeLedger.Sell(inventory, shop, goods, 0), "zero units");
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ModAssert.False(TradeLedger.Sell(inventory, shop, shop.Currency, 1), "money is never sold");
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ModAssert.False(TradeLedger.Sell(inventory, new ShopInfo { ID = "picky" }, goods, 1), "not bought by this shop");
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ModAssert.Equal(before, inventory.CheckCount(goods), "goods untouched");
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ModAssert.Equal(7, inventory.CheckCount(shop.Currency), "money untouched");
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}
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[ModTest("ledger/max_counts")]
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static void MaxCounts(ModTestContext ctx)
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{
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var goods = Goods();
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var shop = Shop(goods);
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var inventory = new Inventory();
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inventory.Add(shop.Currency, 11);
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inventory.Add(goods, 2);
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ModAssert.Equal(3, TradeLedger.MaxBuy(inventory, shop, goods), "11 coins buy three at 3");
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ModAssert.Equal(inventory.CheckCount(goods), TradeLedger.MaxSell(inventory, shop, goods), "the whole stack sells");
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ModAssert.Equal(0, TradeLedger.MaxBuy(inventory, shop, "no/such_item"), "not on sale");
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ModAssert.Equal(0, TradeLedger.MaxSell(inventory, new ShopInfo { ID = "picky" }, goods), "not bought");
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ModAssert.Equal(0, TradeLedger.Money(null, shop), "no inventory, no money");
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}
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}
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}
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