Add inventory count conditions and item removal actions

tests/ItemCountConditionTests.cs

@@ -0,0 +1,33 @@
+namespace Cthangover.Mods.Items.Tests
+{
+    using Cthangover.Core.Items;
+    using Cthangover.Core.Mods.Resolvers;
+    using Cthangover.Core.Mods.Testing;
+    using Cthangover.Core.Scenes;
+    using Cthangover.Core.Settings;
+    using System.Linq;
+
+    /// <summary>Conditions read current inventory state and compose with the scenario language's existing operators.</summary>
+    public class ItemCountConditionTests
+    {
+        [ModTest("items/count_condition_follows_bag_changes")]
+        static void CountFollowsBag(ModTestContext ctx)
+        {
+            var bag = GameData.Instance.Runtime.Inventory;
+            var before = bag.Items;
+            bag.Items = new();
+            try
+            {
+                var id = Entities.Collect<ItemInfo>().Keys.First();
+                ModAssert.True(ScenarioCondition.Evaluate($"item('{id}') == 0"), "empty bag");
+                bag.Add(id, 3);
+                ModAssert.True(ScenarioCondition.Evaluate($"item('{id}') >= 3 && item('{id}') < 4"), "count range");
+                ModAssert.False(ScenarioCondition.Evaluate($"item('{id}') > 3"), "upper bound");
+                bag.Remove(id, 2);
+                ModAssert.True(ScenarioCondition.Evaluate($"item('{id}') == 1"), "updated bag");
+                ModAssert.True(ScenarioCondition.Evaluate("item('missing/item') == 0"), "unknown id counts zero");
+            }
+            finally { bag.Items = before; }
+        }
+    }
+}