1 files changed, 17 insertions, 5 deletions
diff --git a/testdata/scad/features/difference-tests.scad b/testdata/scad/features/difference-tests.scad
index b770764..0751213 100644
--- a/testdata/scad/features/difference-tests.scad
+++ b/testdata/scad/features/difference-tests.scad
@@ -3,27 +3,26 @@ difference();
 // No children
 difference() { }
 
+// Basic
 difference() {
   cube([10,10,10], center=true);
   cylinder(r=4, h=20, center=true);
 }
 
-translate([12,0,0]) difference() {
-  cube([10,10,10], center=true);
-  cylinder(r=4, h=10.5, center=true);
-}
-
+// Two negative objects
 translate([0,12,0]) difference() {
   cube([10,10,10], center=true);
   cylinder(r=4, h=11, center=true);
   rotate([0,90,0]) cylinder(r=4, h=11, center=true);
 }
 
+// Not intersecting
 translate([12,12,0]) difference() {
   cube([10,10,10], center=true);
   translate([0,0,7.01]) cylinder(r=4, h=4, center=true);
 }
 
+// Barely intersecting
 translate([24,0,0]) difference() {
   cube([10,10,10], center=true);
   translate([0,0,6.99]) cylinder(r=4, h=4, center=true);
@@ -34,3 +33,16 @@ translate([24,12,0]) difference() {
   cube([0,10,10], center=true);
   # cylinder(r=4, h=20, center=true);
 }
+
+// Non-geometry (echo) statement as first child should be ignored
+translate([24,-12,0]) difference() {
+  echo("difference-tests");
+  cube([10,10,10], center=true);
+  cylinder(r=4, h=20, center=true);
+}
+
+// Subtracting 2D from 3D
+translate([12,0,0]) difference() {
+  cube([10,10,10], center=true);
+  circle(r=6);
+}