UnitTests + APP_BASE_PATH

test/programs_screenShot.test.js

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+const fs = require('fs');
+const path = require('path');
+
+jest.mock('child_process', () => ({
+  exec: jest.fn(),
+}));
+
+jest.mock('../programs/log', () => ({
+  logSnapshot: jest.fn(),
+}));
+
+const { exec } = require('child_process');
+const { snapshot } = require('../programs/screenShot');
+
+class DummyCamera {
+  async snapshotHighRes() {
+    return Promise.resolve();
+  }
+}
+
+const tempDir = path.join(__dirname, 'data', 'temp');
+const fixedNow = 1778819665744;
+
+beforeEach(() => {
+  jest.clearAllMocks();
+  if (typeof Date.now.mockRestore === 'function') {
+    Date.now.mockRestore();
+  }
+  jest.spyOn(Date, 'now').mockReturnValue(fixedNow);
+  if (!fs.existsSync(tempDir)) {
+    fs.mkdirSync(tempDir, { recursive: true });
+  }
+
+  
+  // Quellpfade
+  const sourceDir = path.join(__dirname, 'data', 'screenShots'); 
+
+  const filesToCopy = [
+    'snapshot_video0_1778819665744.jpg',
+    'snapshot_video1_1778819665744.jpg',
+  ];
+
+  // Dateien kopieren
+  for (const file of filesToCopy) {
+    const src = path.join(sourceDir, file);
+    const dest = path.join(tempDir, file);
+
+    if (fs.existsSync(src)) {
+      fs.copyFileSync(src, dest);
+    } else {
+      throw new Error(`Testdatei fehlt: ${src}`);
+    }
+  }
+
+});
+
+afterEach(() => {
+  if (fs.existsSync(tempDir)) {
+    fs.rmSync(tempDir, { recursive: true, force: true });
+  }
+  if (typeof Date.now.mockRestore === 'function') {
+    Date.now.mockRestore();
+  }
+  
+});
+
+test('snapshot calls both camera snapshotHighRes methods and sends a snapshot response', async () => {
+  const cam0 = new DummyCamera();
+  const cam1 = new DummyCamera();
+  cam0.snapshotHighRes = jest.fn(() => Promise.resolve());
+  cam1.snapshotHighRes = jest.fn(() => Promise.resolve());
+  const ws = { send: jest.fn() };
+
+  const expectedName0 = `snapshot_video0_${fixedNow}.jpg`;
+  const expectedName1 = `snapshot_video1_${fixedNow}.jpg`;
+  const expectedAnnotated = path.join(tempDir, expectedName0.replace('.jpg', '_two_cam_annotated.jpg'));
+  const expectedOverlay = path.join(tempDir, expectedName0.replace('.jpg', '_two_cam_overlay.png'));
+  const expectedCsv = path.join(tempDir, expectedName0.replace('.jpg', '_two_cam.csv'));
+
+  exec.mockImplementation((command, callback) => {
+    fs.writeFileSync(expectedAnnotated, '');
+    fs.writeFileSync(expectedOverlay, '');
+    fs.writeFileSync(expectedCsv, '');
+    callback(null, 'ok', '');
+  });
+
+  const sentPromise = new Promise((resolve) => {
+    ws.send.mockImplementation((message) => resolve(message));
+  });
+
+  snapshot(tempDir, cam0, cam1, ws);
+
+  const rawMessage = await sentPromise;
+  const response = JSON.parse(rawMessage);
+
+  expect(cam0.snapshotHighRes).toHaveBeenCalledWith(path.join(tempDir, expectedName0));
+  expect(cam1.snapshotHighRes).toHaveBeenCalledWith(path.join(tempDir, expectedName1));
+  expect(exec).toHaveBeenCalled();
+  expect(response).toEqual({
+    type: 'snapshot',
+    ok: true,
+    url: `/snapshots/${expectedName0}`,
+    urlApp: `/snapshots/${expectedName0.replace('.jpg', '_two_cam_annotated.jpg')}`,
+    overlay: `/snapshots/${expectedName0.replace('.jpg', '_two_cam_overlay.png')}`,
+    overlayCSV: `/snapshots/${expectedName0.replace('.jpg', '_two_cam.csv')}`,
+  });
+});