diff --git a/test/Robot_JoyIt_01.test.js b/test/Robot_JoyIt_01.test.js
index 4a01e51..03c589e 100755
--- a/test/Robot_JoyIt_01.test.js
+++ b/test/Robot_JoyIt_01.test.js
@@ -27,7 +27,7 @@ test('Handgelenk Position', () => {
 
 });
 
-test('Winkel Oberarm/Unterarm Dreieckck', () => {
+test('Winkel Oberarm/Unterarm Dreieck', () => {
 
   robot = new Robot(300,300,30)
 
@@ -38,6 +38,24 @@ test('Winkel Oberarm/Unterarm Dreieckck', () => {
   robot.theta = 0;
   robot.calculateAngles3D();
 
+  expect(Math.abs(robot.alpha*2 + robot.beta - Math.PI)).toBeLessThanOrEqual(0.0001)
+});
+
+test('Winkel Oberarm/Unterarm Dreieckck', () => {
+
+  robot = new Robot(300,300,30)
+
+  robot.x = robot.l1 + robot.l3;
+  robot.y = 0;
+  robot.z = robot.l2;    
+
+  robot.theta = 0;
+  robot.calculateAngles3D();
+
+  expect(Math.abs(robot.alpha*2 + robot.beta - Math.PI)).toBeLessThanOrEqual(0.0001)
+
+  expect(Math.abs(robot.alpha - Math.PI/4)).toBeLessThanOrEqual(0.0001)
+  expect(Math.abs(robot.beta - Math.PI/2)).toBeLessThanOrEqual(0.0001)
+
   console.log("alpha=", robot.alpha*180/Math.PI, " beta=", robot.beta*180/Math.PI);
-  console.log(robot);
 });
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