Add CSG failing test

Author: DSchroer

tests/csg/test.scad

@@ -0,0 +1,33 @@
+
+// CSG.scad - Basic example of CSG usage
+
+translate([-24,0,0]) {
+    union() {
+        cube(15, center=true);
+        sphere(10);
+    }
+}
+
+intersection() {
+    cube(15, center=true);
+    sphere(10);
+}
+
+translate([24,0,0]) {
+    difference() {
+        cube(15, center=true);
+        sphere(10);
+    }
+}
+
+echo(version=version());
+// Written by Marius Kintel <marius@kintel.net>
+//
+// To the extent possible under law, the author(s) have dedicated all
+// copyright and related and neighboring rights to this software to the
+// public domain worldwide. This software is distributed without any
+// warranty.
+//
+// You should have received a copy of the CC0 Public Domain
+// Dedication along with this software.
+// If not, see <http://creativecommons.org/publicdomain/zero/1.0/>.