diff --git a/Assets/_Project/Tests/EditMode/InventoryDepositSystemTests.cs b/Assets/_Project/Tests/EditMode/InventoryDepositSystemTests.cs
new file mode 100644
index 000000000..216b9465b
--- /dev/null
+++ b/Assets/_Project/Tests/EditMode/InventoryDepositSystemTests.cs
@@ -0,0 +1,131 @@
+using NUnit.Framework;
+using ProjectM.Server;
+using ProjectM.Simulation;
+using Unity.Core;
+using Unity.Entities;
+using Unity.NetCode;
+
+namespace ProjectM.Tests
+{
+    /// <summary>
+    /// Plain-Entities EditMode tests for the server-only <see cref="InventoryDepositSystem"/> — the RPC that
+    /// moves a player's PERSONAL inventory into the shared ledger. Mirrors RegionTransitSystemTests' seeding:
+    /// a ResourceLedger singleton, a mock connection (NetworkId), a player (GhostOwner + InventorySlot +
+    /// PlayerTag), and an InventoryDepositRequest + ReceiveRpcCommandRequest. Pins: a specific-item deposit
+    /// moves the clamped amount; ItemId 0 deposits everything and empties the bag; an unresolvable connection
+    /// moves nothing; the request is consumed either way.
+    /// </summary>
+    public class InventoryDepositSystemTests
+    {
+        static (World world, SimulationSystemGroup group, Entity ledger) MakeWorld(string name)
+        {
+            var world = new World(name);
+            var group = world.GetOrCreateSystemManaged<SimulationSystemGroup>();
+            group.AddSystemToUpdateList(world.GetOrCreateSystem<InventoryDepositSystem>());
+            group.SortSystems();
+            world.SetTime(new TimeData(elapsedTime: 0f, deltaTime: 1f / 60f));
+            var em = world.EntityManager;
+            var ledger = em.CreateEntity(typeof(ResourceLedger));
+            em.AddBuffer<StorageEntry>(ledger);
+            return (world, group, ledger);
+        }
+
+        static Entity MakeConnection(EntityManager em, int networkId)
+        {
+            var e = em.CreateEntity();
+            em.AddComponentData(e, new NetworkId { Value = networkId });
+            return e;
+        }
+
+        static Entity MakePlayer(EntityManager em, int networkId, params (ushort id, int count)[] items)
+        {
+            var e = em.CreateEntity();
+            em.AddComponentData(e, new GhostOwner { NetworkId = networkId });
+            em.AddComponent<PlayerTag>(e);
+            var bag = em.AddBuffer<InventorySlot>(e);
+            foreach (var it in items)
+                bag.Add(new InventorySlot { ItemId = it.id, Count = it.count });
+            return e;
+        }
+
+        static void MakeRequest(EntityManager em, ushort itemId, int count, Entity conn)
+        {
+            var e = em.CreateEntity();
+            em.AddComponentData(e, new InventoryDepositRequest { ItemId = itemId, Count = count });
+            em.AddComponentData(e, new ReceiveRpcCommandRequest { SourceConnection = conn });
+        }
+
+        static int LedgerCount(EntityManager em, Entity ledger, ushort itemId)
+        {
+            var buf = em.GetBuffer<StorageEntry>(ledger);
+            for (int i = 0; i < buf.Length; i++)
+                if (buf[i].ItemId == itemId) return buf[i].Count;
+            return 0;
+        }
+
+        static int InvCount(EntityManager em, Entity player, ushort itemId)
+        {
+            var buf = em.GetBuffer<InventorySlot>(player);
+            return InventoryMath.CountOf(buf, itemId);
+        }
+
+        [Test]
+        public void Deposit_Specific_Item_Moves_Clamped_Amount_To_Ledger()
+        {
+            var (world, group, ledger) = MakeWorld("DepositSpecific");
+            using (world)
+            {
+                var em = world.EntityManager;
+                var conn = MakeConnection(em, 1);
+                var player = MakePlayer(em, 1, (ResourceId.Ore, 30));
+                MakeRequest(em, ResourceId.Ore, 20, conn);
+
+                group.Update();
+
+                Assert.AreEqual(10, InvCount(em, player, ResourceId.Ore), "20 of 30 Ore moved out of the bag.");
+                Assert.AreEqual(20, LedgerCount(em, ledger, ResourceId.Ore), "20 Ore landed in the shared ledger.");
+                using var q = em.CreateEntityQuery(typeof(InventoryDepositRequest));
+                Assert.AreEqual(0, q.CalculateEntityCount(), "The request is consumed.");
+            }
+        }
+
+        [Test]
+        public void Deposit_All_Empties_Bag_Into_Ledger()
+        {
+            var (world, group, ledger) = MakeWorld("DepositAll");
+            using (world)
+            {
+                var em = world.EntityManager;
+                var conn = MakeConnection(em, 1);
+                var player = MakePlayer(em, 1, (ResourceId.Ore, 30), (ResourceId.Aether, 5));
+                MakeRequest(em, itemId: 0, count: 0, conn); // 0 = deposit all
+
+                group.Update();
+
+                Assert.AreEqual(0, InvCount(em, player, ResourceId.Ore), "Deposit-all empties the bag.");
+                Assert.AreEqual(0, InvCount(em, player, ResourceId.Aether));
+                Assert.AreEqual(30, LedgerCount(em, ledger, ResourceId.Ore));
+                Assert.AreEqual(5, LedgerCount(em, ledger, ResourceId.Aether));
+            }
+        }
+
+        [Test]
+        public void Deposit_From_Unresolvable_Connection_Moves_Nothing()
+        {
+            var (world, group, ledger) = MakeWorld("DepositUnknown");
+            using (world)
+            {
+                var em = world.EntityManager;
+                var player = MakePlayer(em, 1, (ResourceId.Ore, 30));
+                MakeRequest(em, ResourceId.Ore, 20, Entity.Null); // no NetworkId on Entity.Null
+
+                group.Update();
+
+                Assert.AreEqual(30, InvCount(em, player, ResourceId.Ore), "An unresolvable sender moves nothing.");
+                Assert.AreEqual(0, LedgerCount(em, ledger, ResourceId.Ore));
+                using var q = em.CreateEntityQuery(typeof(InventoryDepositRequest));
+                Assert.AreEqual(0, q.CalculateEntityCount(), "The request is still consumed.");
+            }
+        }
+    }
+}
diff --git a/Assets/_Project/Tests/EditMode/InventoryDepositSystemTests.cs.meta b/Assets/_Project/Tests/EditMode/InventoryDepositSystemTests.cs.meta
new file mode 100644
index 000000000..3d1127cf0
--- /dev/null
+++ b/Assets/_Project/Tests/EditMode/InventoryDepositSystemTests.cs.meta
@@ -0,0 +1,2 @@
+fileFormatVersion: 2
+guid: e0a222e00ad08444793bf5b1ffccc71a
\ No newline at end of file
diff --git a/Assets/_Project/Tests/EditMode/InventoryHarvestTests.cs b/Assets/_Project/Tests/EditMode/InventoryHarvestTests.cs
new file mode 100644
index 000000000..c742174b8
--- /dev/null
+++ b/Assets/_Project/Tests/EditMode/InventoryHarvestTests.cs
@@ -0,0 +1,141 @@
+using NUnit.Framework;
+using ProjectM.Server;
+using ProjectM.Simulation;
+using Unity.Core;
+using Unity.Entities;
+using Unity.Mathematics;
+using Unity.NetCode;
+using Unity.Transforms;
+
+namespace ProjectM.Tests
+{
+    /// <summary>
+    /// Plain-Entities EditMode tests for the harvest -&gt; PERSONAL inventory reroute in
+    /// <see cref="ResourceHarvestSystem"/>. A bare world is seeded with a ResourceLedger singleton, a node,
+    /// a player (GhostOwner + InventorySlot + PlayerTag) and an OWNED projectile (matching GhostOwner). Pins:
+    /// an owned hit lands in the player's inventory and leaves the ledger untouched; a full bag spills the
+    /// remainder to the ledger; an owned projectile whose NetworkId has no live player falls back to the ledger.
+    /// The 8 owner-less tests in <see cref="ResourceHarvestSystemTests"/> pin the un-owned -&gt; ledger fallback.
+    /// </summary>
+    public class InventoryHarvestTests
+    {
+        static (World world, SimulationSystemGroup group, Entity ledger) MakeWorld(string name)
+        {
+            var world = new World(name);
+            var group = world.GetOrCreateSystemManaged<SimulationSystemGroup>();
+            group.AddSystemToUpdateList(world.GetOrCreateSystem<ResourceHarvestSystem>());
+            group.SortSystems();
+            world.SetTime(new TimeData(elapsedTime: 0f, deltaTime: 1f / 60f));
+            var em = world.EntityManager;
+            var ledger = em.CreateEntity(typeof(ResourceLedger));
+            em.AddBuffer<StorageEntry>(ledger);
+            return (world, group, ledger);
+        }
+
+        static Entity MakeNode(EntityManager em, float3 pos, float hitRadius, byte resourceId, int remaining, float perHit)
+        {
+            var e = em.CreateEntity();
+            em.AddComponentData(e, LocalTransform.FromPosition(pos));
+            em.AddComponentData(e, new HitRadius { Value = hitRadius });
+            em.AddComponentData(e, new ResourceNode { ResourceId = resourceId, Remaining = remaining, HarvestPerHit = perHit });
+            return e;
+        }
+
+        static Entity MakePlayer(EntityManager em, int networkId)
+        {
+            var e = em.CreateEntity();
+            em.AddComponentData(e, new GhostOwner { NetworkId = networkId });
+            em.AddComponent<PlayerTag>(e);
+            em.AddBuffer<InventorySlot>(e);
+            return e;
+        }
+
+        static Entity MakeOwnedProjectile(EntityManager em, float3 pos, float2 dir, float lastStep, int networkId)
+        {
+            var e = em.CreateEntity();
+            em.AddComponentData(e, LocalTransform.FromPosition(pos));
+            em.AddComponentData(e, new Projectile { Direction = dir, LastStep = lastStep });
+            em.AddComponentData(e, new GhostOwner { NetworkId = networkId });
+            return e;
+        }
+
+        static int LedgerCount(EntityManager em, Entity ledger, ushort itemId)
+        {
+            var buf = em.GetBuffer<StorageEntry>(ledger);
+            for (int i = 0; i < buf.Length; i++)
+                if (buf[i].ItemId == itemId) return buf[i].Count;
+            return 0;
+        }
+
+        static int InvCount(EntityManager em, Entity player, ushort itemId)
+        {
+            var buf = em.GetBuffer<InventorySlot>(player);
+            return InventoryMath.CountOf(buf, itemId);
+        }
+
+        [Test]
+        public void Owned_Harvest_Lands_In_Player_Inventory_Ledger_Untouched()
+        {
+            var (world, group, ledger) = MakeWorld("OwnedHarvest");
+            using (world)
+            {
+                var em = world.EntityManager;
+                var player = MakePlayer(em, networkId: 1);
+                var node = MakeNode(em, new float3(10, 1, 10), 1f, ResourceId.Aether, remaining: 100, perHit: 25f);
+                var proj = MakeOwnedProjectile(em, new float3(10, 1, 10), new float2(1, 0), 5f, networkId: 1);
+
+                group.Update();
+
+                Assert.AreEqual(25, InvCount(em, player, ResourceId.Aether), "The owner's harvest lands in their personal inventory.");
+                Assert.AreEqual(0, LedgerCount(em, ledger, ResourceId.Aether), "The shared ledger is untouched by an owned harvest.");
+                Assert.AreEqual(75, em.GetComponentData<ResourceNode>(node).Remaining);
+                Assert.IsFalse(em.Exists(proj), "The projectile is consumed.");
+            }
+        }
+
+        [Test]
+        public void Full_Bag_Spills_Remainder_To_Ledger()
+        {
+            var (world, group, ledger) = MakeWorld("FullBagSpill");
+            using (world)
+            {
+                var em = world.EntityManager;
+                var player = MakePlayer(em, networkId: 1);
+                // Fill all InventoryMaxSlots with distinct dummy items so no slot is free for the harvested id.
+                var bag = em.GetBuffer<InventorySlot>(player);
+                for (int i = 0; i < Tuning.InventoryMaxSlots; i++)
+                    bag.Add(new InventorySlot { ItemId = (ushort)(100 + i), Count = 1 });
+
+                var node = MakeNode(em, new float3(10, 1, 10), 1f, ResourceId.Ore, remaining: 100, perHit: 25f);
+                var proj = MakeOwnedProjectile(em, new float3(10, 1, 10), new float2(1, 0), 5f, networkId: 1);
+
+                group.Update();
+
+                Assert.AreEqual(0, InvCount(em, player, ResourceId.Ore), "A full bag cannot take the harvested item.");
+                Assert.AreEqual(25, LedgerCount(em, ledger, ResourceId.Ore), "The full amount spills to the shared ledger.");
+                Assert.AreEqual(75, em.GetComponentData<ResourceNode>(node).Remaining, "The node decrements by the FULL amount, not just the part that fit.");
+                Assert.IsFalse(em.Exists(proj));
+            }
+        }
+
+        [Test]
+        public void Owned_Projectile_With_No_Matching_Player_Falls_Back_To_Ledger()
+        {
+            var (world, group, ledger) = MakeWorld("NoMatchingPlayer");
+            using (world)
+            {
+                var em = world.EntityManager;
+                var player = MakePlayer(em, networkId: 1);
+                var node = MakeNode(em, new float3(10, 1, 10), 1f, ResourceId.Aether, remaining: 100, perHit: 25f);
+                // Projectile owned by NetworkId 99 — no live player has that id.
+                var proj = MakeOwnedProjectile(em, new float3(10, 1, 10), new float2(1, 0), 5f, networkId: 99);
+
+                group.Update();
+
+                Assert.AreEqual(0, InvCount(em, player, ResourceId.Aether), "Player 1 gets nothing — it didn't fire this shot.");
+                Assert.AreEqual(25, LedgerCount(em, ledger, ResourceId.Aether), "An unresolvable owner falls back to the shared ledger.");
+                Assert.IsFalse(em.Exists(proj));
+            }
+        }
+    }
+}
diff --git a/Assets/_Project/Tests/EditMode/InventoryHarvestTests.cs.meta b/Assets/_Project/Tests/EditMode/InventoryHarvestTests.cs.meta
new file mode 100644
index 000000000..941ac28f1
--- /dev/null
+++ b/Assets/_Project/Tests/EditMode/InventoryHarvestTests.cs.meta
@@ -0,0 +1,2 @@
+fileFormatVersion: 2
+guid: 42fed61a7f84fd740b17ec2c4cff8204
\ No newline at end of file
diff --git a/Assets/_Project/Tests/EditMode/InventoryMathTests.cs b/Assets/_Project/Tests/EditMode/InventoryMathTests.cs
new file mode 100644
index 000000000..ffb22ebf9
--- /dev/null
+++ b/Assets/_Project/Tests/EditMode/InventoryMathTests.cs
@@ -0,0 +1,89 @@
+using NUnit.Framework;
+using ProjectM.Simulation;
+using Unity.Entities;
+
+namespace ProjectM.Tests
+{
+    /// <summary>
+    /// Plain-Entities EditMode tests for the pure <see cref="InventoryMath"/> stacking logic (the per-player
+    /// bag math): top-up-then-append with a per-item stack cap, a max slot count returning a remainder, and
+    /// back-to-front withdraw clamped to availability. A bare world hosts an entity that owns the
+    /// <see cref="InventorySlot"/> buffer (a DynamicBuffer needs an entity); no systems run.
+    /// </summary>
+    public class InventoryMathTests
+    {
+        static (World world, DynamicBuffer<InventorySlot> buffer) MakeBuffer()
+        {
+            var world = new World("InventoryMathTest");
+            var em = world.EntityManager;
+            var e = em.CreateEntity();
+            var buffer = em.AddBuffer<InventorySlot>(e);
+            return (world, buffer);
+        }
+
+        [Test]
+        public void Deposit_TopsUpExistingStack_ThenAppends_NewStack()
+        {
+            var (world, buf) = MakeBuffer();
+            using (world)
+            {
+                int r1 = InventoryMath.Deposit(buf, itemId: 1, count: 5, stackMax: 10, maxSlots: 4);
+                Assert.AreEqual(0, r1, "5 fits in one fresh stack.");
+                Assert.AreEqual(1, buf.Length);
+
+                int r2 = InventoryMath.Deposit(buf, itemId: 1, count: 8, stackMax: 10, maxSlots: 4);
+                Assert.AreEqual(0, r2, "8 more tops the first stack to 10 then appends 3.");
+                Assert.AreEqual(2, buf.Length, "A second stack is appended once the first fills.");
+                Assert.AreEqual(13, InventoryMath.CountOf(buf, 1));
+                Assert.AreEqual(10, buf[0].Count, "First stack is capped at stackMax.");
+                Assert.AreEqual(3, buf[1].Count);
+            }
+        }
+
+        [Test]
+        public void Deposit_FillsMultipleStacks_UpToSlotCap_ReturnsRemainder()
+        {
+            var (world, buf) = MakeBuffer();
+            using (world)
+            {
+                // 2 slots * stackMax 10 = 20 capacity; depositing 25 leaves a remainder of 5.
+                int r = InventoryMath.Deposit(buf, itemId: 2, count: 25, stackMax: 10, maxSlots: 2);
+                Assert.AreEqual(5, r, "Past the slot cap, the overflow is returned as a remainder.");
+                Assert.AreEqual(2, buf.Length);
+                Assert.AreEqual(20, InventoryMath.CountOf(buf, 2));
+            }
+        }
+
+        [Test]
+        public void Withdraw_TakesAcrossStacks_BackToFront_Clamped_ReturnsTaken()
+        {
+            var (world, buf) = MakeBuffer();
+            using (world)
+            {
+                InventoryMath.Deposit(buf, itemId: 3, count: 25, stackMax: 10, maxSlots: 4); // 10,10,5
+                int taken = InventoryMath.Withdraw(buf, itemId: 3, count: 12);
+                Assert.AreEqual(12, taken);
+                Assert.AreEqual(13, InventoryMath.CountOf(buf, 3));
+
+                int takenAll = InventoryMath.Withdraw(buf, itemId: 3, count: 100);
+                Assert.AreEqual(13, takenAll, "Withdraw clamps to what is available.");
+                Assert.AreEqual(0, InventoryMath.CountOf(buf, 3));
+                Assert.AreEqual(0, buf.Length, "Emptied stacks are dropped.");
+            }
+        }
+
+        [Test]
+        public void Deposit_ZeroItemId_OrNonPositiveCount_AreNoOps()
+        {
+            var (world, buf) = MakeBuffer();
+            using (world)
+            {
+                Assert.AreEqual(7, InventoryMath.Deposit(buf, itemId: 0, count: 7, stackMax: 10, maxSlots: 4),
+                    "Depositing the empty id deposits nothing and returns the full count.");
+                Assert.AreEqual(0, InventoryMath.Deposit(buf, itemId: 1, count: 0, stackMax: 10, maxSlots: 4));
+                Assert.AreEqual(0, InventoryMath.Deposit(buf, itemId: 1, count: -3, stackMax: 10, maxSlots: 4));
+                Assert.AreEqual(0, buf.Length, "No rows were written.");
+            }
+        }
+    }
+}
diff --git a/Assets/_Project/Tests/EditMode/InventoryMathTests.cs.meta b/Assets/_Project/Tests/EditMode/InventoryMathTests.cs.meta
new file mode 100644
index 000000000..39d7f04ac
--- /dev/null
+++ b/Assets/_Project/Tests/EditMode/InventoryMathTests.cs.meta
@@ -0,0 +1,2 @@
+fileFormatVersion: 2
+guid: dbdfefb1a0acad849b84fadfb2938d9e
\ No newline at end of file