Added test and move function.

Signed-off-by: Dennis Labordus <dennis.labordus@alliander.com>

Author: Dennis Labordus

test/unit/compas/CompasLabelsField.test.ts

@@ -39,6 +39,15 @@ describe('compas-labels-field', () => {
       expect(labelElements.length).to.be.equal(1);
     });
 
+    it('when calling updateLabelsInPrivateElement then Private Element is updated', async () => {
+      expect(privateElement.querySelectorAll('Label').length).to.be.equal(0);
+
+      await addLabel(element, 'Label1');
+      element.updateLabelsInPrivateElement(privateElement);
+
+      expect(privateElement.querySelectorAll('Label').length).to.be.equal(1);
+    });
+
     it('looks like the latest snapshot', async () => {
       await expect(element).shadowDom.to.equalSnapshot();
     });