chore: added tests

got 50.72% code coverage. Not sure if it is feasible to mock import behaviour

ref: N25B-189

package.json

@@ -7,7 +7,8 @@
     "dev": "vite",
     "build": "tsc -b && vite build",
     "lint": "eslint .",
-    "preview": "vite preview"
+    "preview": "vite preview",
+    "test": "jest"
   },
   "dependencies": {
     "@neodrag/react": "^2.3.1",

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

@@ -1,8 +1,8 @@
-import React from "react";
 import useFlowStore from "../VisProgStores";
 import styles from "../../VisProg.module.css";
-import { useReactFlow, type Edge } from "@xyflow/react";
+import {type Edge } from "@xyflow/react";
 import type { AppNode } from "../VisProgTypes";
+import { cleanup } from "@testing-library/react";
 
 type SavedProject = {
   version: 1;
@@ -14,7 +14,7 @@ type SavedProject = {
 
 
 
-function makeProjectBlob(name: string, nodes: AppNode[], edges: Edge[]): Blob {
+export function makeProjectBlob(name: string, nodes: AppNode[], edges: Edge[]): Blob {
   const payload = {
     version: 1,
     name,
@@ -109,9 +109,7 @@ export default function SaveLoadPanel() {
       }
 
       //We clear all the current edges and nodes
-      setEdges([]);
-      setNodes([]);
-
+      cleanup();
       //set all loaded nodes and edges into the VisProg
       const loadedNodes = proj.nodes as AppNode[];
       const loadedEdges = proj.edges as Edge[];

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

@@ -0,0 +1,172 @@
+import { mockReactFlow } from '../../../../setupFlowTests.ts';
+import { act, render, screen, fireEvent } from '@testing-library/react';
+import useFlowStore from '../../../../../src/pages/VisProgPage/visualProgrammingUI/VisProgStores.tsx';
+import { addNode } from '../../../../../src/pages/VisProgPage/visualProgrammingUI/components/DragDropSidebar.tsx';
+import { makeProjectBlob } from '../../../../../src/pages/VisProgPage/visualProgrammingUI/components/SaveLoadPanel.tsx';
+import SaveLoadPanel from '../../../../../src/pages/VisProgPage/visualProgrammingUI/components/SaveLoadPanel.tsx';
+
+beforeAll(() => {
+  mockReactFlow();
+});
+
+beforeEach(() => {
+  const { setNodes, setEdges } = useFlowStore.getState();
+  act(() => {
+    setNodes([]);
+    setEdges([]);
+  });
+});
+
+afterEach(() => {
+  jest.restoreAllMocks();
+});
+
+describe('Load and save panel', () => {
+  test('save and load functions work correctly', async () => {
+    // create two nodes via your sidebar API
+    act(() => {
+      addNode('phase', { x: 100, y: 100 });
+      addNode('norm',  { x: 200, y: 200 });
+    });
+
+    const initialState = useFlowStore.getState();
+    expect(initialState.nodes.length).toBe(2);
+
+    // make blob from current nodes/edges
+    const blob = makeProjectBlob('test-project', initialState.nodes, initialState.edges);
+
+    // simulate loading from that blob
+    const parsed = JSON.parse(await blobToText(blob));
+
+    act(() => {
+      const { setNodes, setEdges } = useFlowStore.getState();
+      setEdges([]); // clear edges first (mirrors app behavior)
+      setNodes(parsed.nodes);
+      setEdges(parsed.edges);
+    });
+
+    const loadedState = useFlowStore.getState();
+    expect(loadedState.nodes.length).toBe(2);
+    expect(loadedState.nodes).toEqual(initialState.nodes);
+    expect(loadedState.edges).toEqual(initialState.edges);
+  });
+
+  test('Save uses showSaveFilePicker and writes JSON', async () => {
+    // Seed a simple graph so Save has something to write
+    act(() => {
+      useFlowStore.getState().setNodes([
+        { id: 'start', type: 'start', position: { x: 0, y: 0 }, data: { label: 'start' } } as any,
+        { id: 'phase-1', type: 'phase', position: { x: 100, y: 120 }, data: { label: 'P1', number: 1 } } as any,
+        { id: 'end', type: 'end', position: { x: 0, y: 300 }, data: { label: 'End' } } as any,
+      ]);
+      useFlowStore.getState().setEdges([
+        { id: 'start-phase-1', source: 'start', target: 'phase-1' } as any,
+      ]);
+    });
+
+    // capture what the app writes; don't decode inside the spy
+    let writtenChunk: any = null;
+    const write = jest.fn(async (chunk: any) => { writtenChunk = chunk; });
+    const close = jest.fn().mockResolvedValue(undefined);
+    const createWritable = jest.fn().mockResolvedValue({ write, close });
+
+    // Mock the picker
+    (window as any).showSaveFilePicker = jest.fn().mockResolvedValue({ createWritable });
+
+    render(<SaveLoadPanel />);
+
+    await act(async () => {
+      fireEvent.click(screen.getByText(/Save Graph/i));
+    });
+    // @ts-expect-error
+    expect(window.showSaveFilePicker).toHaveBeenCalledTimes(1);
+    expect(createWritable).toHaveBeenCalledTimes(1);
+    expect(write).toHaveBeenCalledTimes(1);
+    expect(close).toHaveBeenCalledTimes(1);
+
+    const writtenText = await chunkToString(writtenChunk);
+    const json = JSON.parse(writtenText);
+    expect(json.version).toBe(1);
+    expect(json.name).toBeDefined();
+    expect(Array.isArray(json.nodes)).toBe(true);
+    expect(Array.isArray(json.edges)).toBe(true);
+    expect(json.behaviorProgram).toBeUndefined();
+  });
+
+  test('Save falls back to anchor download when picker unavailable', async () => {
+    // Remove picker so we hit the fallback
+    delete (window as any).showSaveFilePicker;
+
+    // Keep a reference to the REAL createElement to avoid recursion
+    const realCreateElement = document.createElement.bind(document);
+
+    // Spy on URL + anchor click
+    const origCreateObjectURL = URL.createObjectURL;
+    const origRevokeObjectURL = URL.revokeObjectURL;
+    (URL as any).createObjectURL = jest.fn(() => 'blob:fake-url');
+    (URL as any).revokeObjectURL = jest.fn();
+
+    const clickSpy = jest.fn();
+    const createElementSpy = jest
+      .spyOn(document, 'createElement')
+      .mockImplementation((tag: any, opts?: any) => {
+        if (tag === 'a') {
+          // return a minimal anchor with a click spy
+          return {
+            set href(_v: string) {},
+            set download(_v: string) {},
+            click: clickSpy,
+          } as unknown as HTMLAnchorElement;
+        }
+        // call the REAL createElement for everything else
+        return realCreateElement(tag, opts as any);
+      });
+
+    render(<SaveLoadPanel />);
+
+    await act(async () => {
+      fireEvent.click(screen.getByText(/Save Graph/i));
+    });
+
+    expect(URL.createObjectURL).toHaveBeenCalledTimes(1);
+    expect(clickSpy).toHaveBeenCalledTimes(1);
+
+    // cleanup
+    createElementSpy.mockRestore();
+    (URL as any).createObjectURL = origCreateObjectURL;
+    (URL as any).revokeObjectURL = origRevokeObjectURL;
+  });
+});
+
+//
+// helpers
+//
+
+// portable blob reader (no Response needed)
+async function blobToText(blob: Blob): Promise<string> {
+  const anyBlob = blob as any;
+  if (typeof anyBlob.text === 'function') return anyBlob.text();
+  if (typeof anyBlob.arrayBuffer === 'function') {
+    const buf = await anyBlob.arrayBuffer();
+    return new TextDecoder().decode(buf);
+  }
+  return await new Promise<string>((resolve, reject) => {
+    const fr = new FileReader();
+    fr.onload = () => resolve(String(fr.result));
+    fr.onerror = () => reject(fr.error);
+    fr.readAsText(blob);
+  });
+}
+
+// normalize whatever chunk createWritable.write receives to a string
+async function chunkToString(chunk: any): Promise<string> {
+  if (typeof chunk === 'string') return chunk;
+  if (chunk instanceof Blob) return blobToText(chunk);
+  if (chunk?.buffer instanceof ArrayBuffer) {
+    return new TextDecoder().decode(chunk as Uint8Array);
+  }
+  if (chunk instanceof ArrayBuffer) {
+    return new TextDecoder().decode(new Uint8Array(chunk));
+  }
+  return String(chunk);
+}