feat(battle-node): in-memory IBattleSessionStore + PendingBattle

SVSim.UnitTests/BattleNode/Sessions/InMemoryBattleSessionStoreTests.cs

@@ -0,0 +1,43 @@
+using NUnit.Framework;
+using SVSim.BattleNode.Sessions;
+
+namespace SVSim.UnitTests.BattleNode.Sessions;
+
+[TestFixture]
+public class InMemoryBattleSessionStoreTests
+{
+    private InMemoryBattleSessionStore _store = null!;
+
+    [SetUp] public void Setup() => _store = new InMemoryBattleSessionStore();
+
+    [Test]
+    public void RegisterThenGet_ReturnsRegisteredBattle()
+    {
+        var battle = new PendingBattle("bid-1", 906243102);
+        _store.RegisterPending(battle);
+
+        Assert.That(_store.TryGetPending("bid-1"), Is.EqualTo(battle));
+    }
+
+    [Test]
+    public void Get_UnknownBattleId_ReturnsNull()
+    {
+        Assert.That(_store.TryGetPending("nope"), Is.Null);
+    }
+
+    [Test]
+    public void Remove_ReturnsTrueWhenPresent_FalseWhenAbsent()
+    {
+        _store.RegisterPending(new PendingBattle("bid", 1));
+        Assert.That(_store.RemovePending("bid"), Is.True);
+        Assert.That(_store.RemovePending("bid"), Is.False);
+    }
+
+    [Test]
+    public void Register_DuplicateBattleId_OverwritesPrior()
+    {
+        _store.RegisterPending(new PendingBattle("bid", 1));
+        _store.RegisterPending(new PendingBattle("bid", 2));
+        Assert.That(_store.TryGetPending("bid")!.ViewerId, Is.EqualTo(2));
+    }
+}