test(inventory): lifecycle — dispose rollback + use-after-commit

Co-Authored-By: Claude Opus 4.7 <noreply@anthropic.com>

SVSim.UnitTests/Services/Inventory/InventoryLifecycleTests.cs

@@ -0,0 +1,51 @@
+using Microsoft.EntityFrameworkCore;
+using Microsoft.Extensions.DependencyInjection;
+using SVSim.Database;
+using SVSim.Database.Enums;
+using SVSim.Database.Services;
+using SVSim.Database.Services.Inventory;
+using SVSim.UnitTests.Infrastructure;
+
+namespace SVSim.UnitTests.Services.Inventory;
+
+public class InventoryLifecycleTests
+{
+    [Test]
+    public async Task Dispose_without_commit_does_not_persist()
+    {
+        using var factory = new SVSimTestFactory();
+        long viewerId = await factory.SeedViewerAsync();
+        using var scope = factory.Services.CreateScope();
+        var ctx = scope.ServiceProvider.GetRequiredService<SVSimDbContext>();
+        var v = await ctx.Viewers.FirstAsync(x => x.Id == viewerId);
+        v.Currency.Rupees = 100;
+        await ctx.SaveChangesAsync();
+
+        var inv = scope.ServiceProvider.GetRequiredService<IInventoryService>();
+        await using (var tx = await inv.BeginAsync(viewerId))
+        {
+            await tx.GrantAsync(UserGoodsType.Rupy, 0, 50);
+            // no commit; dispose runs
+        }
+
+        using var verifyScope = factory.Services.CreateScope();
+        var ctx2 = verifyScope.ServiceProvider.GetRequiredService<SVSimDbContext>();
+        var v2 = await ctx2.Viewers.AsNoTracking().FirstAsync(x => x.Id == viewerId);
+        Assert.That(v2.Currency.Rupees, Is.EqualTo(100UL), "no persistence without commit");
+    }
+
+    [Test]
+    public async Task Use_after_commit_throws()
+    {
+        using var factory = new SVSimTestFactory();
+        long viewerId = await factory.SeedViewerAsync();
+        using var scope = factory.Services.CreateScope();
+        var inv = scope.ServiceProvider.GetRequiredService<IInventoryService>();
+
+        await using var tx = await inv.BeginAsync(viewerId);
+        await tx.CommitAsync();
+
+        Assert.ThrowsAsync<InvalidOperationException>(
+            async () => { await tx.GrantAsync(UserGoodsType.Rupy, 0, 1); });
+    }
+}