diff --git a/test/test_all.scad b/test/test_all.scad
index dd62108a..23e71315 100644
--- a/test/test_all.scad
+++ b/test/test_all.scad
@@ -91,6 +91,7 @@ include <voxel/test_vx_cylinder.scad>;
 include <voxel/test_vx_sphere.scad>;
 include <voxel/test_vx_polygon.scad>;
 include <voxel/test_vx_intersection.scad>;
+include <voxel/test_vx_difference.scad>;
 
 // Matrix
 include <matrix/test_m_scaling.scad>;
diff --git a/test/voxel/test_vx_difference.scad b/test/voxel/test_vx_difference.scad
new file mode 100644
index 00000000..1afd5001
--- /dev/null
+++ b/test/voxel/test_vx_difference.scad
@@ -0,0 +1,17 @@
+use <voxel/vx_difference.scad>;
+use <voxel/vx_cylinder.scad>;
+use <voxel/vx_sphere.scad>;
+
+module test_vx_difference() {
+    echo("==== test_vx_difference ====");
+
+    expected = [[-3, -5, 0], [-2, -5, 0], [-1, -5, 0], [0, -5, 0], [1, -5, 0], [2, -5, 0], [3, -5, 0], [-4, -4, 0], [-3, -4, 0], [3, -4, 0], [4, -4, 0], [-5, -3, 0], [-4, -3, 0], [4, -3, 0], [5, -3, 0], [-5, -2, 0], [5, -2, 0], [-5, -1, 0], [5, -1, 0], [-5, 0, 0], [5, 0, 0], [-5, 1, 0], [5, 1, 0], [-5, 2, 0], [5, 2, 0], [-5, 3, 0], [-4, 3, 0], [4, 3, 0], [5, 3, 0], [-4, 4, 0], [-3, 4, 0], [3, 4, 0], [4, 4, 0], [-3, 5, 0], [-2, 5, 0], [-1, 5, 0], [0, 5, 0], [1, 5, 0], [2, 5, 0], [3, 5, 0], [-3, -5, 1], [-2, -5, 1], [-1, -5, 1], [0, -5, 1], [1, -5, 1], [2, -5, 1], [3, -5, 1], [-4, -4, 1], [-3, -4, 1], [3, -4, 1], [4, -4, 1], [-5, -3, 1], [-4, -3, 1], [4, -3, 1], [5, -3, 1], [-5, -2, 1], [5, -2, 1], [-5, -1, 1], [5, -1, 1], [-5, 0, 1], [5, 0, 1], [-5, 1, 1], [5, 1, 1], [-5, 2, 1], [5, 2, 1], [-5, 3, 1], [-4, 3, 1], [4, 3, 1], [5, 3, 1], [-4, 4, 1], [-3, 4, 1], [3, 4, 1], [4, 4, 1], [-3, 5, 1], [-2, 5, 1], [-1, 5, 1], [0, 5, 1], [1, 5, 1], [2, 5, 1], [3, 5, 1], [-3, -5, 2], [-2, -5, 2], [-1, -5, 2], [0, -5, 2], [1, -5, 2], [2, -5, 2], [3, -5, 2], [-4, -4, 2], [-3, -4, 2], [3, -4, 2], [4, -4, 2], [-5, -3, 2], [-4, -3, 2], [4, -3, 2], [5, -3, 2], [-5, -2, 2], [5, -2, 2], [-5, -1, 2], [5, -1, 2], [-5, 0, 2], [5, 0, 2], [-5, 1, 2], [5, 1, 2], [-5, 2, 2], [5, 2, 2], [-5, 3, 2], [-4, 3, 2], [4, 3, 2], [5, 3, 2], [-4, 4, 2], [-3, 4, 2], [3, 4, 2], [4, 4, 2], [-3, 5, 2], [-2, 5, 2], [-1, 5, 2], [0, 5, 2], [1, 5, 2], [2, 5, 2], [3, 5, 2], [-3, -5, 3], [-2, -5, 3], [-1, -5, 3], [0, -5, 3], [1, -5, 3], [2, -5, 3], [3, -5, 3], [-4, -4, 3], [-3, -4, 3], [-2, -4, 3], [-1, -4, 3], [0, -4, 3], [1, -4, 3], [2, -4, 3], [3, -4, 3], [4, -4, 3], [-5, -3, 3], [-4, -3, 3], [-3, -3, 3], [3, -3, 3], [4, -3, 3], [5, -3, 3], [-5, -2, 3], [-4, -2, 3], [4, -2, 3], [5, -2, 3], [-5, -1, 3], [-4, -1, 3], [4, -1, 3], [5, -1, 3], [-5, 0, 3], [-4, 0, 3], [4, 0, 3], [5, 0, 3], [-5, 1, 3], [-4, 1, 3], [4, 1, 3], [5, 1, 3], [-5, 2, 3], [-4, 2, 3], [4, 2, 3], [5, 2, 3], [-5, 3, 3], [-4, 3, 3], [-3, 3, 3], [3, 3, 3], [4, 3, 3], [5, 3, 3], [-4, 4, 3], [-3, 4, 3], [-2, 4, 3], [-1, 4, 3], [0, 4, 3], [1, 4, 3], [2, 4, 3], [3, 4, 3], [4, 4, 3], [-3, 5, 3], [-2, 5, 3], [-1, 5, 3], [0, 5, 3], [1, 5, 3], [2, 5, 3], [3, 5, 3]];   
+    actual = vx_difference(
+        vx_cylinder(6, 4, filled = true),
+        vx_sphere(5, filled = true)
+    );
+    
+    assert(expected == actual);
+}
+
+test_vx_difference();
\ No newline at end of file