diff --git a/src/mesh.ts b/src/mesh.ts
index 935a0b4..b3bbcee 100644
--- a/src/mesh.ts
+++ b/src/mesh.ts
@@ -51,6 +51,7 @@ export class Mesh extends Warnable {
         this._loadedTextures = {};
     }
 
+    // TODO: Always check
     public processMesh() {
         this._checkMesh();
         this._checkMaterials();
diff --git a/src/util.ts b/src/util.ts
index db0a829..d2a4542 100644
--- a/src/util.ts
+++ b/src/util.ts
@@ -295,6 +295,7 @@ export const PALETTES_DIR = path.join(RESOURCES_DIR, './palettes/');
 export const STATIC_DIR = path.join(RESOURCES_DIR, './static/');
 export const SHADERS_DIR = path.join(RESOURCES_DIR, './shaders/');
 export const TOOLS_DIR = path.join(BASE_DIR, './tools/');
+export const TESTS_DATA_DIR = path.join(BASE_DIR, './tests/data/');
 
 export function getRandomID(): string {
     return (Math.random() + 1).toString(36).substring(7);
diff --git a/src/voxel_mesh.ts b/src/voxel_mesh.ts
index a5d3d9e..c8f0a73 100644
--- a/src/voxel_mesh.ts
+++ b/src/voxel_mesh.ts
@@ -18,7 +18,7 @@ export interface VoxelMeshParams {
     desiredHeight: number,
     useMultisampleColouring: boolean,
     textureFiltering: TextureFiltering,
-    ambientOcclusionEnabled: boolean,
+    ambientOcclusionEnabled: boolean, // TODO: Refactor into rendering
 }
 
 export class VoxelMesh {
@@ -55,6 +55,13 @@ export class VoxelMesh {
         return this._voxelsHash.has(pos);
     }
 
+    public getVoxelAt(pos: Vector3) {
+        const voxelIndex = this._voxelsHash.get(pos);
+        if (voxelIndex !== undefined) {
+            return this._voxels[voxelIndex];
+        }
+    }
+
     public getMesh() {
         return this._mesh;
     }
diff --git a/tests/data/cube.mtl b/tests/data/cube.mtl
new file mode 100644
index 0000000..8272758
--- /dev/null
+++ b/tests/data/cube.mtl
@@ -0,0 +1,82 @@
+# Blender 3.1.0 MTL File: 'None'
+# www.blender.org
+
+newmtl black
+Ns 250.000000
+Ka 1.000000 1.000000 1.000000
+Kd 0.000000 0.000000 0.000000
+Ks 0.500000 0.500000 0.500000
+Ke 0.000000 0.000000 0.000000
+Ni 1.450000
+d 1.000000
+illum 2
+
+newmtl blue
+Ns 250.000000
+Ka 1.000000 1.000000 1.000000
+Kd 0.000000 0.000000 1.000000
+Ks 0.500000 0.500000 0.500000
+Ke 0.000000 0.000000 0.000000
+Ni 1.450000
+d 1.000000
+illum 2
+
+newmtl cyan
+Ns 250.000000
+Ka 1.000000 1.000000 1.000000
+Kd 0.000000 1.000000 1.000000
+Ks 0.500000 0.500000 0.500000
+Ke 0.000000 0.000000 0.000000
+Ni 1.450000
+d 1.000000
+illum 2
+
+newmtl green
+Ns 250.000000
+Ka 1.000000 1.000000 1.000000
+Kd 0.000000 1.000000 0.000000
+Ks 0.500000 0.500000 0.500000
+Ke 0.000000 0.000000 0.000000
+Ni 1.450000
+d 1.000000
+illum 2
+
+newmtl magenta
+Ns 250.000000
+Ka 1.000000 1.000000 1.000000
+Kd 1.000000 0.000000 1.000000
+Ks 0.500000 0.500000 0.500000
+Ke 0.000000 0.000000 0.000000
+Ni 1.450000
+d 1.000000
+illum 2
+
+newmtl red
+Ns 250.000000
+Ka 1.000000 1.000000 1.000000
+Kd 1.000000 0.000000 0.000000
+Ks 0.500000 0.500000 0.500000
+Ke 0.000000 0.000000 0.000000
+Ni 1.450000
+d 1.000000
+illum 2
+
+newmtl white
+Ns 250.000000
+Ka 1.000000 1.000000 1.000000
+Kd 1.000000 1.000000 1.000000
+Ks 0.500000 0.500000 0.500000
+Ke 0.000000 0.000000 0.000000
+Ni 1.450000
+d 1.000000
+illum 2
+
+newmtl yellow
+Ns 250.000000
+Ka 1.000000 1.000000 1.000000
+Kd 1.000000 1.000000 0.000000
+Ks 0.500000 0.500000 0.500000
+Ke 0.000000 0.000000 0.000000
+Ni 1.450000
+d 1.000000
+illum 2
diff --git a/tests/data/cube.obj b/tests/data/cube.obj
new file mode 100644
index 0000000..52f9728
--- /dev/null
+++ b/tests/data/cube.obj
@@ -0,0 +1,123 @@
+# Blender 3.1.0
+# www.blender.org
+mtllib cube.mtl
+o Cube
+v -1.000000 -1.000000 1.000000
+v -1.000000 1.000000 1.000000
+v -1.000000 -1.000000 -1.000000
+v -1.000000 1.000000 -1.000000
+v 1.000000 -1.000000 1.000000
+v 1.000000 1.000000 1.000000
+v 1.000000 -1.000000 -1.000000
+v 1.000000 1.000000 -1.000000
+v -1.000000 -1.000000 0.000000
+v -1.000000 1.000000 0.000000
+v 1.000000 -1.000000 0.000000
+v 1.000000 1.000000 0.000000
+v -1.000000 0.000000 1.000000
+v -1.000000 0.000000 -1.000000
+v 1.000000 0.000000 -1.000000
+v 1.000000 0.000000 1.000000
+v 1.000000 0.000000 0.000000
+v -1.000000 0.000000 0.000000
+v 0.000000 -1.000000 -1.000000
+v 0.000000 1.000000 -1.000000
+v 0.000000 -1.000000 1.000000
+v 0.000000 1.000000 1.000000
+v 0.000000 1.000000 0.000000
+v 0.000000 -1.000000 0.000000
+v 0.000000 0.000000 1.000000
+v 0.000000 0.000000 -1.000000
+vn -1.0000 -0.0000 -0.0000
+vn -0.0000 -0.0000 -1.0000
+vn 1.0000 -0.0000 -0.0000
+vn -0.0000 -0.0000 1.0000
+vn -0.0000 -1.0000 -0.0000
+vn -0.0000 1.0000 -0.0000
+vt 0.375000 0.000000
+vt 0.375000 1.000000
+vt 0.125000 0.750000
+vt 0.625000 1.000000
+vt 0.875000 0.750000
+vt 0.625000 0.000000
+vt 0.375000 0.250000
+vt 0.125000 0.500000
+vt 0.875000 0.500000
+vt 0.625000 0.250000
+vt 0.375000 0.750000
+vt 0.625000 0.750000
+vt 0.375000 0.500000
+vt 0.625000 0.500000
+vt 0.375000 0.125000
+vt 0.125000 0.625000
+vt 0.875000 0.625000
+vt 0.625000 0.125000
+vt 0.375000 0.625000
+vt 0.625000 0.625000
+vt 0.500000 0.000000
+vt 0.500000 1.000000
+vt 0.500000 0.250000
+vt 0.500000 0.500000
+vt 0.500000 0.750000
+vt 0.500000 0.625000
+vt 0.500000 0.125000
+vt 0.375000 0.375000
+vt 0.250000 0.500000
+vt 0.750000 0.500000
+vt 0.625000 0.375000
+vt 0.375000 0.875000
+vt 0.250000 0.750000
+vt 0.750000 0.750000
+vt 0.625000 0.875000
+vt 0.750000 0.625000
+vt 0.250000 0.625000
+vt 0.500000 0.875000
+vt 0.500000 0.375000
+s 0
+usemtl blue
+f 18/27/1 10/18/1 4/10/1 14/23/1
+usemtl green
+f 26/39/2 20/31/2 8/14/2 15/24/2
+usemtl red
+f 17/26/3 12/20/3 6/12/3 16/25/3
+usemtl white
+f 25/38/4 22/35/4 2/4/4 13/22/4
+usemtl yellow
+f 24/37/5 11/19/5 5/11/5 21/33/5
+usemtl white
+f 23/36/6 10/17/6 2/5/6 22/34/6
+usemtl blue
+f 20/30/6 4/9/6 10/17/6 23/36/6
+usemtl cyan
+f 19/29/5 7/13/5 11/19/5 24/37/5
+usemtl green
+f 15/24/3 8/14/3 12/20/3 17/26/3
+usemtl white
+f 13/21/1 2/6/1 10/18/1 18/27/1
+usemtl black
+f 1/1/1 13/21/1 18/27/1 9/15/1
+usemtl cyan
+f 7/13/3 15/24/3 17/26/3 11/19/3
+usemtl black
+f 21/32/4 25/38/4 13/22/4 1/2/4
+usemtl yellow
+f 11/19/3 17/26/3 16/25/3 5/11/3
+usemtl cyan
+f 19/28/2 26/39/2 15/24/2 7/13/2
+usemtl magenta
+f 9/15/1 18/27/1 14/23/1 3/7/1
+f 3/7/2 14/23/2 26/39/2 19/28/2
+usemtl yellow
+f 5/11/4 16/25/4 25/38/4 21/32/4
+usemtl magenta
+f 3/8/5 19/29/5 24/37/5 9/16/5
+usemtl green
+f 8/14/6 20/30/6 23/36/6 12/20/6
+usemtl red
+f 12/20/6 23/36/6 22/34/6 6/12/6
+usemtl black
+f 9/16/5 24/37/5 21/33/5 1/3/5
+usemtl red
+f 16/25/4 6/12/4 22/35/4 25/38/4
+usemtl blue
+f 14/23/2 4/10/2 20/31/2 26/39/2
diff --git a/tests/normal-corrected-ray-voxeliser.test.ts b/tests/normal-corrected-ray-voxeliser.test.ts
new file mode 100644
index 0000000..54a728b
--- /dev/null
+++ b/tests/normal-corrected-ray-voxeliser.test.ts
@@ -0,0 +1,64 @@
+import { NormalCorrectedRayVoxeliser } from '../src/voxelisers/normal-corrected-ray-voxeliser';
+import { ObjImporter } from '../src/importers/obj_importer';
+import { TextureFiltering } from '../src/texture';
+import { ASSERT, RGB } from '../src/util';
+import { Vector3 } from '../src/vector';
+
+import path from 'path';
+
+test('Parse vertex #1', () => {
+    const importer = new ObjImporter();
+    importer.parseFile(path.join(__dirname, './data/cube.obj'));
+    const mesh = importer.toMesh();
+    mesh.processMesh();
+
+    const voxeliser = new NormalCorrectedRayVoxeliser();
+    const voxelMesh = voxeliser.voxelise(mesh, {
+        desiredHeight: 2,
+        useMultisampleColouring: false,
+        textureFiltering: TextureFiltering.Nearest,
+        ambientOcclusionEnabled: false,
+    });
+
+    const expectedVoxels = [
+        {
+            position: new Vector3(0, 1, 0),
+            colour: new RGB(0, 0, 1),
+        },
+        {
+            position: new Vector3(1, 1, 0),
+            colour: new RGB(0, 1, 0),
+        },
+        {
+            position: new Vector3(1, 1, 1),
+            colour: new RGB(1, 0, 0),
+        },
+        {
+            position: new Vector3(0, 1, 1),
+            colour: new RGB(1, 1, 1),
+        },
+        {
+            position: new Vector3(1, 0, 1),
+            colour: new RGB(1, 1, 0),
+        },
+        {
+            position: new Vector3(1, 0, 0),
+            colour: new RGB(0, 1, 1),
+        },
+        {
+            position: new Vector3(0, 0, 1),
+            colour: new RGB(0, 0, 0),
+        },
+        {
+            position: new Vector3(0, 0, 0),
+            colour: new RGB(1, 0, 1),
+        },
+    ];
+
+    for (const expected of expectedVoxels) {
+        expect(voxelMesh.isVoxelAt(expected.position)).toBe(true);
+        const voxel = voxelMesh.getVoxelAt(expected.position);
+        expect(voxel).toBeDefined(); ASSERT(voxel);
+        expect(voxel.colour.toVector3().equals(expected.colour.toVector3()));
+    }
+});