diff --git a/web/test/cases/craftCut.js b/web/test/cases/craftCut.js
index 3f6e660a..4e7e3000 100644
--- a/web/test/cases/craftCut.js
+++ b/web/test/cases/craftCut.js
@@ -7,7 +7,7 @@ export function testCutMid(env, ui) {
   ui.selectFaces([0, 0, 210], [0, 0, 190]);
 
   let sui = ui.openSketcher();
-  sui.addPolygon(-50, -50, 50, 50);
+  sui.addRectangle(-50, -50, 50, 50);
   ui.commitSketch();
 
   ui.openWizard('CUT');
@@ -22,7 +22,7 @@ export function testCutCOI1Faces(env, ui) {
   ui.selectFaces([0, 0, 210], [0, 0, 190]);
 
   let sui = ui.openSketcher();
-  sui.addPolygon(0, 0, 80, 100);
+  sui.addRectangle(0, 0, 80, 100);
   ui.commitSketch();
 
   ui.openWizard('CUT');
@@ -37,7 +37,7 @@ export function testCutCOI2Faces(env, ui) {
   ui.selectFaces([0, 0, 210], [0, 0, 190]);
 
   let sui = ui.openSketcher();
-  sui.addPolygon(0, 0, 100, 100);
+  sui.addRectangle(0, 0, 100, 100);
   ui.commitSketch();
 
   ui.openWizard('CUT');
@@ -52,7 +52,7 @@ export function testCutCOI3Faces(env, ui) {
   ui.selectFaces([0, 0, 210], [0, 0, 190]);
 
   let sui = ui.openSketcher();
-  sui.addPolygon(0, -100, 100, 100);
+  sui.addRectangle(0, -100, 100, 100);
   ui.commitSketch();
 
   ui.openWizard('CUT');
@@ -67,7 +67,7 @@ export function testCutCOI4Faces(env, ui) {
   ui.selectFaces([0, 0, 210], [0, 0, 190]);
 
   let sui = ui.openSketcher();
-  sui.addPolygon(-100, -100, 100, 100);
+  sui.addRectangle(-100, -100, 100, 100);
   ui.commitSketch();
 
   ui.openWizard('CUT');
@@ -84,7 +84,7 @@ export function testCutMidAllWay(env, ui) {
   ui.selectFaces([0, 0, 210], [0, 0, 190]);
 
   let sui = ui.openSketcher();
-  sui.addPolygon(-50, -50, 50, 50);
+  sui.addRectangle(-50, -50, 50, 50);
   ui.commitSketch();
 
   ui.openWizard('CUT');
@@ -99,7 +99,7 @@ export function testCutCOI1FacesAllWay(env, ui) {
   ui.selectFaces([0, 0, 210], [0, 0, 190]);
 
   let sui = ui.openSketcher();
-  sui.addPolygon(0, 0, 80, 100);
+  sui.addRectangle(0, 0, 80, 100);
   ui.commitSketch();
 
   ui.openWizard('CUT');
@@ -114,7 +114,7 @@ export function testCutCOI2FacesAllWay(env, ui) {
   ui.selectFaces([0, 0, 210], [0, 0, 190]);
 
   let sui = ui.openSketcher();
-  sui.addPolygon(0, 0, 100, 100);
+  sui.addRectangle(0, 0, 100, 100);
   ui.commitSketch();
 
   ui.openWizard('CUT');
@@ -129,7 +129,7 @@ export function testCutCOI3FacesAllWay(env, ui) {
   ui.selectFaces([0, 0, 210], [0, 0, 190]);
 
   let sui = ui.openSketcher();
-  sui.addPolygon(0, -100, 100, 100);
+  sui.addRectangle(0, -100, 100, 100);
   ui.commitSketch();
 
   ui.openWizard('CUT');
@@ -144,7 +144,7 @@ export function testCutCOI4FacesAllWay(env, ui) {
   ui.selectFaces([0, 0, 210], [0, 0, 190]);
 
   let sui = ui.openSketcher();
-  sui.addPolygon(-100, -100, 100, 100);
+  sui.addRectangle(-100, -100, 100, 100);
   ui.commitSketch();
 
   ui.openWizard('CUT');
diff --git a/web/test/cases/craftExtrude.js b/web/test/cases/craftExtrude.js
index 6ff06193..831cbe55 100644
--- a/web/test/cases/craftExtrude.js
+++ b/web/test/cases/craftExtrude.js
@@ -7,7 +7,7 @@ export function testExtrudeMid(env, ui) {
   ui.selectFaces([0, 0, 210], [0, 0, 190]);
 
   let sui = ui.openSketcher();
-  sui.addPolygon(-50, -50, 50, 50);
+  sui.addRectangle(-50, -50, 50, 50);
   ui.commitSketch();
 
   ui.openWizard('EXTRUDE');
@@ -22,7 +22,7 @@ export function testExtrudeCOI1Faces(env, ui) {
   ui.selectFaces([0, 0, 210], [0, 0, 190]);
 
   let sui = ui.openSketcher();
-  sui.addPolygon(0, 0, 80, 100);
+  sui.addRectangle(0, 0, 80, 100);
   ui.commitSketch();
 
   ui.openWizard('EXTRUDE');
@@ -37,7 +37,7 @@ export function testExtrudeCOI2Faces(env, ui) {
   ui.selectFaces([0, 0, 210], [0, 0, 190]);
 
   let sui = ui.openSketcher();
-  sui.addPolygon(0, 0, 100, 100);
+  sui.addRectangle(0, 0, 100, 100);
   ui.commitSketch();
 
   ui.openWizard('EXTRUDE');
@@ -52,7 +52,7 @@ export function testExtrudeCOI3Faces(env, ui) {
   ui.selectFaces([0, 0, 210], [0, 0, 190]);
 
   let sui = ui.openSketcher();
-  sui.addPolygon(0, -100, 100, 100);
+  sui.addRectangle(0, -100, 100, 100);
   ui.commitSketch();
 
   ui.openWizard('EXTRUDE');
@@ -67,7 +67,7 @@ export function testExtrudeCOI4Faces(env, ui) {
   ui.selectFaces([0, 0, 210], [0, 0, 190]);
 
   let sui = ui.openSketcher();
-  sui.addPolygon(-100, -100, 100, 100);
+  sui.addRectangle(-100, -100, 100, 100);
   ui.commitSketch();
 
   ui.openWizard('EXTRUDE');
diff --git a/web/test/cases/craftExtrudeOptions.js b/web/test/cases/craftExtrudeOptions.js
index a4d09b86..1fdcd4c1 100644
--- a/web/test/cases/craftExtrudeOptions.js
+++ b/web/test/cases/craftExtrudeOptions.js
@@ -6,7 +6,7 @@ export const TEST_MODE = 'modellerUI';
 export function testExtrudePrism(env, ui) {
   let sketcherUI = createPlaneAndOpenSketcher(ui);
   let sketchedFace = ui.context.services.selection.face.single;
-  let [S1, S2, S3, S4] = sketcherUI.addPolygon(-100, -100, 100, 100);
+  let [S1, S2, S3, S4] = sketcherUI.addRectangle(-100, -100, 100, 100);
   
   // let gauge = ui.prismSurfaceGauge([-100, -100, 0], [100, -100, 0], [50, 50, 0], [-50, 50, 0] );
   //
diff --git a/web/test/cases/craftLoft.js b/web/test/cases/craftLoft.js
index 28d58296..361d082f 100644
--- a/web/test/cases/craftLoft.js
+++ b/web/test/cases/craftLoft.js
@@ -4,7 +4,7 @@ export const TEST_MODE = 'modellerUI';
 
 export function testLoftOver2Sections(env, ui) {
   let sui = createPlaneAndOpenSketcher(ui);
-  sui.addPolygon(-100, -100, 100, 100);
+  sui.addRectangle(-100, -100, 100, 100);
   ui.commitSketch();
 
   ui.openWizard('PLANE');
@@ -12,7 +12,7 @@ export function testLoftOver2Sections(env, ui) {
   ui.wizardOK();
   ui.selectFaces([0, 0, 290], [0, 0, 310]);
   sui = ui.openSketcher();
-  sui.addSerpinski([-100, 0], [100, 0], 2);
+  sui.addRectangle([0, -100], [100, 100], [-100, 100]);
   ui.commitSketch();
 
   ui.openWizard('LOFT');
diff --git a/web/test/cases/craftRevolve.js b/web/test/cases/craftRevolve.js
index cc840310..804f7471 100644
--- a/web/test/cases/craftRevolve.js
+++ b/web/test/cases/craftRevolve.js
@@ -5,7 +5,7 @@ export const TEST_MODE = 'modellerUI';
 export function testRevolveHalfWay(env, ui) {
   createPlaneAndOpenSketcher(ui);
   let sui = ui.openSketcher();
-  sui.addPolygon(20, -50, 50, 50);
+  sui.addRectangle(20, -50, 50, 50);
   sui.changeToConstructionLayer();
   sui.addSegment(0, -50, 0, 50);
   ui.commitSketch();
@@ -21,7 +21,7 @@ export function testRevolveHalfWay(env, ui) {
 export function testRevolveAllWay(env, ui) {
   createPlaneAndOpenSketcher(ui);
   let sui = ui.openSketcher();
-  sui.addPolygon(20, -50, 50, 50);
+  sui.addRectangle(20, -50, 50, 50);
   sui.changeToConstructionLayer();
   sui.addSegment(0, -50, 0, 50);
   ui.commitSketch();
diff --git a/web/test/utils/scripts.js b/web/test/utils/scripts.js
index 2942906b..045ca16d 100644
--- a/web/test/utils/scripts.js
+++ b/web/test/utils/scripts.js
@@ -8,7 +8,7 @@ export function createPlaneAndOpenSketcher(ui) {
 
 export function extrudeCube(ui) {
   let sketcherUI = createPlaneAndOpenSketcher(ui);
-  sketcherUI.addPolygon(-100, -100, 100, 100);
+  sketcherUI.addRectangle(-100, -100, 100, 100);
   ui.commitSketch();
   ui.selectFaces([0, 0, -10], [0, 0, 10]);
   ui.openWizard('EXTRUDE');
diff --git a/web/test/utils/subjects/modeller/sketcherUISubject.js b/web/test/utils/subjects/modeller/sketcherUISubject.js
index 253ddb63..2d0612a1 100644
--- a/web/test/utils/subjects/modeller/sketcherUISubject.js
+++ b/web/test/utils/subjects/modeller/sketcherUISubject.js
@@ -28,7 +28,7 @@ export function createSubjectFromInPlaceSketcher(ctx) {
   const addEllipticalArc = sketcher_utils.addEllipticalArc.bind(this, oldStyleSketcherApp);
   const addBezier = sketcher_utils.addBezier.bind(this, oldStyleSketcherApp);
   const move = sketcher_utils.moveInModel.bind(this, oldStyleSketcherApp);
-  function addPolygon(x0, y0, x1, y1) {
+  function addRectangle(x0, y0, x1, y1) {
     return [
       addSegment(x0, y0, x1, y0),
       addSegment(x1, y0, x1, y1),
@@ -40,24 +40,25 @@ export function createSubjectFromInPlaceSketcher(ctx) {
   function addSerpinski([ax, ay], [bx, by], depth) {
     genSerpinskiImpl(ctx.services.sketcher.inPlaceEditor.viewer, {x: ax, y: ay}, {x: bx, y: by}, depth);
     let jointWidth = distance(ax, ay, bx, by) / (depth + 1) / 2;
-
     let dx = bx - ax;
     let dy = by - ay;
-    
     let D = Math.sqrt(dx*dx + dy*dy);
-
     dx /= D;
     dy /= D;
-
     let ddx = -dy * jointWidth;
     let ddy =  dx * jointWidth;
-
-
     genSerpinskiImpl(ctx.services.sketcher.inPlaceEditor.viewer, {x: bx-ddx, y: by-ddy}, {x: ax-ddx, y: ay-ddy}, depth);
     addSegment(ax, ay, ax-ddx, ay-ddy);
     addSegment(bx, by, bx-ddx, by-ddy);
   }
   
+  function addPolygon(points) {
+    let p, q, n = points.length;
+    for(p = n - 1, q = 0; q < n; p = q++) {
+      addSegment(p, q);
+    }
+  }
+  
   function changeLayer(layerName) {
     ctx.services.sketcher.inPlaceEditor.viewer.setActiveLayerName(layerName);
   }
@@ -71,8 +72,8 @@ export function createSubjectFromInPlaceSketcher(ctx) {
   }
 
   return {
-    addSegment, addPolygon, addArc, addCircle, addEllipse, addEllipticalArc, addSerpinski, addBezier, 
-    move, changeLayer, changeToConstructionLayer, changeToDefaultLayer, 
+    addSegment, addRectangle, addArc, addCircle, addEllipse, addEllipticalArc, addSerpinski, addBezier, addPolygon, 
+    move, changeLayer, changeToConstructionLayer, changeToDefaultLayer
   }
   
 }
\ No newline at end of file