diff --git a/test/pixel/test_px_sphere.scad b/test/pixel/test_px_sphere.scad
new file mode 100644
index 00000000..47907bd9
--- /dev/null
+++ b/test/pixel/test_px_sphere.scad
@@ -0,0 +1,11 @@
+
+module test_px_sphere() {
+    echo("==== test_px_sphere ====");
+
+    include <unittest.scad>;
+    include <pixel/px_sphere.scad>;
+    expected = [[-4, -2, -2], [-4, -2, -1], [-4, -2, 0], [-4, -2, 1], [-4, -2, 2], [-4, -1, -2], [-4, -1, -1], [-4, -1, 0], [-4, -1, 1], [-4, -1, 2], [-4, 0, -2], [-4, 0, -1], [-4, 0, 0], [-4, 0, 1], [-4, 0, 2], [-4, 1, -2], [-4, 1, -1], [-4, 1, 0], [-4, 1, 1], [-4, 1, 2], [-4, 2, -2], [-4, 2, -1], [-4, 2, 0], [-4, 2, 1], [-4, 2, 2], [-3, -3, -2], [-3, -3, -1], [-3, -3, 0], [-3, -3, 1], [-3, -3, 2], [-3, -2, -3], [-3, -2, -2], [-3, -2, 2], [-3, -2, 3], [-3, -1, -3], [-3, -1, 3], [-3, 0, -3], [-3, 0, 3], [-3, 1, -3], [-3, 1, 3], [-3, 2, -3], [-3, 2, -2], [-3, 2, 2], [-3, 2, 3], [-3, 3, -2], [-3, 3, -1], [-3, 3, 0], [-3, 3, 1], [-3, 3, 2], [-2, -4, -2], [-2, -4, -1], [-2, -4, 0], [-2, -4, 1], [-2, -4, 2], [-2, -3, -3], [-2, -3, -2], [-2, -3, 2], [-2, -3, 3], [-2, -2, -4], [-2, -2, -3], [-2, -2, 3], [-2, -2, 4], [-2, -1, -4], [-2, -1, 4], [-2, 0, -4], [-2, 0, 4], [-2, 1, -4], [-2, 1, 4], [-2, 2, -4], [-2, 2, -3], [-2, 2, 3], [-2, 2, 4], [-2, 3, -3], [-2, 3, -2], [-2, 3, 2], [-2, 3, 3], [-2, 4, -2], [-2, 4, -1], [-2, 4, 0], [-2, 4, 1], [-2, 4, 2], [-1, -4, -2], [-1, -4, -1], [-1, -4, 0], [-1, -4, 1], [-1, -4, 2], [-1, -3, -3], [-1, -3, 3], [-1, -2, -4], [-1, -2, 4], [-1, -1, -4], [-1, -1, 4], [-1, 0, -4], [-1, 0, 4], [-1, 1, -4], [-1, 1, 4], [-1, 2, -4], [-1, 2, 4], [-1, 3, -3], [-1, 3, 3], [-1, 4, -2], [-1, 4, -1], [-1, 4, 0], [-1, 4, 1], [-1, 4, 2], [0, -4, -2], [0, -4, -1], [0, -4, 0], [0, -4, 1], [0, -4, 2], [0, -3, -3], [0, -3, 3], [0, -2, -4], [0, -2, 4], [0, -1, -4], [0, -1, 4], [0, 0, -4], [0, 0, 4], [0, 1, -4], [0, 1, 4], [0, 2, -4], [0, 2, 4], [0, 3, -3], [0, 3, 3], [0, 4, -2], [0, 4, -1], [0, 4, 0], [0, 4, 1], [0, 4, 2], [1, -4, -2], [1, -4, -1], [1, -4, 0], [1, -4, 1], [1, -4, 2], [1, -3, -3], [1, -3, 3], [1, -2, -4], [1, -2, 4], [1, -1, -4], [1, -1, 4], [1, 0, -4], [1, 0, 4], [1, 1, -4], [1, 1, 4], [1, 2, -4], [1, 2, 4], [1, 3, -3], [1, 3, 3], [1, 4, -2], [1, 4, -1], [1, 4, 0], [1, 4, 1], [1, 4, 2], [2, -4, -2], [2, -4, -1], [2, -4, 0], [2, -4, 1], [2, -4, 2], [2, -3, -3], [2, -3, -2], [2, -3, 2], [2, -3, 3], [2, -2, -4], [2, -2, -3], [2, -2, 3], [2, -2, 4], [2, -1, -4], [2, -1, 4], [2, 0, -4], [2, 0, 4], [2, 1, -4], [2, 1, 4], [2, 2, -4], [2, 2, -3], [2, 2, 3], [2, 2, 4], [2, 3, -3], [2, 3, -2], [2, 3, 2], [2, 3, 3], [2, 4, -2], [2, 4, -1], [2, 4, 0], [2, 4, 1], [2, 4, 2], [3, -3, -2], [3, -3, -1], [3, -3, 0], [3, -3, 1], [3, -3, 2], [3, -2, -3], [3, -2, -2], [3, -2, 2], [3, -2, 3], [3, -1, -3], [3, -1, 3], [3, 0, -3], [3, 0, 3], [3, 1, -3], [3, 1, 3], [3, 2, -3], [3, 2, -2], [3, 2, 2], [3, 2, 3], [3, 3, -2], [3, 3, -1], [3, 3, 0], [3, 3, 1], [3, 3, 2], [4, -2, -2], [4, -2, -1], [4, -2, 0], [4, -2, 1], [4, -2, 2], [4, -1, -2], [4, -1, -1], [4, -1, 0], [4, -1, 1], [4, -1, 2], [4, 0, -2], [4, 0, -1], [4, 0, 0], [4, 0, 1], [4, 0, 2], [4, 1, -2], [4, 1, -1], [4, 1, 0], [4, 1, 1], [4, 1, 2], [4, 2, -2], [4, 2, -1], [4, 2, 0], [4, 2, 1], [4, 2, 2]];    actual = px_sphere(5, false);
+    assertEqualPoints(expected, actual);
+}
+
+test_px_sphere();
\ No newline at end of file
diff --git a/test/test_all.scad b/test/test_all.scad
index 8a15bb02..9435c942 100644
--- a/test/test_all.scad
+++ b/test/test_all.scad
@@ -70,4 +70,5 @@ include <test_path_extrude.scad>;
 include <pixel/test_px_line.scad>;
 include <pixel/test_px_polyline.scad>;
 include <pixel/test_px_circle.scad>;
-include <pixel/test_px_cylinder.scad>;
\ No newline at end of file
+include <pixel/test_px_cylinder.scad>;
+include <pixel/test_px_sphere.scad>;
\ No newline at end of file