test: added tests for deleteNode function

ref: N25B-114

test/pages/visProgPage/visualProgrammingUI/VisProgStores.test.tsx

@@ -125,6 +125,42 @@ describe('FlowStore Functionality', () => {
       );
     });
   });
+  describe('ReactFlow deleteNode', () => {
+    // test deleting A and B, so we make sure the connecting edge gets deleted regardless of
+    test.each([['A','B'],['B','A']])('deletes a node and its connected edges', (nodeId, undeletedNodeId) => {
+      const {deleteNode} = useFlowStore.getState();
+      useFlowStore.setState({
+        nodes: [
+          {
+            id: 'A',
+            type: 'default',
+            position: {x: 0, y: 0},
+            data: {label: 'A'}
+          },
+          {
+            id: 'B',
+            type: 'default',
+            position: {x: 0, y: 300},
+            data: {label: 'A'}
+          }],
+        edges: [
+          {
+            id: 'xy-edge__A-B',
+            source: 'A',
+            target: 'B'
+          }]
+      });
+
+      act(()=> {
+        deleteNode(nodeId);
+      });
+
+      const updatedState = useFlowStore.getState();
+      expect(updatedState.edges).toHaveLength(0);
+      expect(updatedState.nodes).toHaveLength(1);
+      expect(updatedState.nodes[0].id).toBe(undeletedNodeId);
+    });
+  });
   describe('ReactFlow setNodes', () => {
     test('sets nodes to the provided list of nodes', () => {
       const {setNodes} = useFlowStore.getState();