test: added test for addNode error

added test for addNode error thrown on unexpected node type

ref: N25B-114

src/pages/VisProgPage/visualProgrammingUI/components/DragDropSidebar.tsx

@@ -13,11 +13,6 @@ import useFlowStore from "../VisProgStores.tsx";
 import styles from "../../VisProg.module.css"
 
 
-// Is used to make sure each subsequent node gets a unique id, so the ReactFlow implementation
-// can distinguish between different nodes.
-let id = 0;
-const getId = () => `dndnode_${id++}`;
-
 /**
  * DraggableNodeProps dictates the type properties of a DraggableNode
  */
@@ -97,12 +92,7 @@ export function addNode(nodeType: string, position: XYPosition) {
         };
       }
       default: {
-        return {
-          id: getId(),
-          type: nodeType,
-          position,
-          data: {label: `new default node`},
-        };
+        throw new Error(`Node ${nodeType} not found`);
       }
     }
   }

test/pages/visProgPage/visualProgrammingUI/components/DragDropSidebar.test.tsx

@@ -27,4 +27,7 @@ describe('Drag-and-Drop sidebar', () => {
     expect(updatedState.nodes[0].id).toBe(`${nodeType}-0`);
     expect(updatedState.nodes[1].id).toBe(`${nodeType}-1`);
   });
+  test('throws error on unexpected node type', () => {
+      expect(() => addNode('I do not Exist', {x:100, y:100})).toThrow("Node I do not Exist not found");
+  })
 });