diff --git a/packages/dev/core/test/unit/Culling/babylon.octreeBlock.test.ts b/packages/dev/core/test/unit/Culling/babylon.octreeBlock.test.ts
new file mode 100644
index 00000000000..80335a8be39
--- /dev/null
+++ b/packages/dev/core/test/unit/Culling/babylon.octreeBlock.test.ts
@@ -0,0 +1,114 @@
+import { ArcRotateCamera } from "core/Cameras";
+import type { Ray } from "core/Culling";
+import { OctreeSceneComponent } from "core/Culling";
+import type { Engine } from "core/Engines";
+import { NullEngine } from "core/Engines";
+import { Vector3 } from "core/Maths";
+import type { AbstractMesh } from "core/Meshes";
+import { MeshBuilder } from "core/Meshes";
+import { SmartArrayNoDuplicate } from "core/Misc";
+import { Scene } from "core/scene";
+
+describe("OctreeBlock", function () {
+    let engine: Engine;
+    let scene: Scene;
+
+    const boxPositions: [number, number, number][] = [
+        [0, 1, 0],
+        [1, 0, 1],
+        [0, 0, 0],
+        [0, 1, 1],
+        [1, 1, 0],
+        [1, 5, 1],
+        [1, 1, 1],
+        [1, -1, -1],
+        [-1, 5, 1],
+        [-1, -5, 1],
+        [0, 8, 0],
+        [8, 0, 8],
+        [0, 0, 0],
+        [0, 8, 8],
+        [8, 8, 0],
+        [8, 5, 8],
+        [8, 8, 8],
+        [8, -8, -8],
+        [-4, 9, 4],
+        [-4, -9, 4],
+        [0, 4, 0],
+        [-4, 0, 4],
+        [0, 0, 0],
+        [0, 4, 4],
+        [-4, 4, 0],
+        [-4, 9, 4],
+        [-4, 4, 4],
+        [-4, -4, -4],
+        [4, 9, 4],
+        [4, -9, 4],
+    ];
+
+    beforeEach(() => {
+        engine = new NullEngine({
+            renderHeight: 256,
+            renderWidth: 256,
+            textureSize: 256,
+            deterministicLockstep: false,
+            lockstepMaxSteps: 1,
+        });
+        scene = new Scene(engine);
+
+        new ArcRotateCamera("Camera", 0, Math.PI / 2, 5, new Vector3(0, 0, 0), scene);
+
+        boxPositions.forEach((pos, i) => {
+            MeshBuilder.CreateBox(`box_${i}`, { size: 1 }, scene).position.set(...pos);
+        });
+        scene.render();
+    });
+
+    describe("intersectsRay", () => {
+        it("should set selection with block entries", () => {
+            // Create octree
+            const component = new OctreeSceneComponent(scene);
+            scene.createOrUpdateSelectionOctree(4);
+
+            // Find first octree block with entry
+            const blockWithEntries = scene.selectionOctree.blocks[4];
+            expect(blockWithEntries).toBeDefined();
+            expect(blockWithEntries.entries.length).toEqual(1);
+
+            // Call intersectsRay
+            const ray = { intersectsBoxMinMax: (_min, _max) => true } as Ray;
+            const rayIntersectsBoxMinMaxSpy = jest.spyOn(ray, "intersectsBoxMinMax");
+            const selection = new SmartArrayNoDuplicate<AbstractMesh>(128);
+            blockWithEntries!.intersectsRay(ray, selection);
+
+            // Ray intersects should be called once and with actual vectors
+            expect(rayIntersectsBoxMinMaxSpy).toHaveBeenCalledTimes(1);
+            expect(rayIntersectsBoxMinMaxSpy).toHaveBeenCalledWith(new Vector3(2, -9.5, -8.5), new Vector3(8.5, 0, 0));
+
+            // Selection should contain the mesh from the block
+            expect(selection.length).toEqual(1);
+            expect(selection.data[0].name).toEqual("box_17");
+        });
+    });
+
+    describe("createInnerBlocks", () => {
+        it("should clean block when after subdivide", () => {
+            // Create octree
+            const component = new OctreeSceneComponent(scene);
+            scene.createOrUpdateSelectionOctree(4);
+
+            // Find first octree block with entries and save it count
+            const blockWithEntries = scene.selectionOctree.blocks.find((b) => !!b.entries.length);
+            const blockEntriesCount = blockWithEntries?.entries.length ?? 0;
+            expect(blockWithEntries).toBeDefined();
+
+            // After subdivide block should no contain direct entries
+            blockWithEntries!.createInnerBlocks();
+            expect(blockWithEntries!.entries.length).toEqual(0);
+
+            // And sub blocks should have entries count equal to parent entries count
+            const targetBlocksEntriesCount = blockWithEntries!.blocks.reduce((acc, b) => acc + b.entries.length, 0);
+            expect(targetBlocksEntriesCount).toEqual(blockEntriesCount);
+        });
+    });
+});