add setop tests in loop

test/operations.jl

@@ -5,4 +5,22 @@
             op(p...)
         end
     end
+
+    function looped_op(;ct = 5, op = diff)
+
+        hole_interval = 10/(ct + 1)
+
+        c = Square([10,10])
+
+        for i = 1:ct
+            h = translate([hole_interval*i, 10/2])Circle(1)
+            c = op(c, h)
+        end
+    end
+
+    # test type stability of setops in a loop
+    @test typeof(looped_op(;ct=3, op=diff)) == typeof(looped_op(;ct=5, op=diff))
+    @test typeof(looped_op(;ct=3, op=union)) == typeof(looped_op(;ct=5, op=union))
+    @test typeof(looped_op(;ct=3, op=intersect)) == typeof(looped_op(;ct=5, op=intersect))
+
 end

test/runtests.jl

@@ -1,4 +1,4 @@
-using Descartes: Sphere, Cuboid, Cylinder, CSGUnion, CSGIntersect, CSGDiff, MapContainer, Piping, FRep, Square, translate, rotate, Shell, RadiusedCSGUnion
+using Descartes: Sphere, Cuboid, Cylinder, CSGUnion, CSGIntersect, CSGDiff, MapContainer, Piping, FRep, Square, Circle, translate, rotate, Shell, RadiusedCSGUnion, LinearExtrude
 using StaticArrays
 using Test
 using Combinatorics