🧪 Add test for batch ZIP generation failure

.gitignore

@@ -1,2 +1,5 @@
 __pycache__/
 *.pyc
+node_modules/
+playwright-report/
+test-results/

package.json

@@ -0,0 +1,27 @@
+{
+  "name": "app",
+  "version": "1.0.0",
+  "description": "**Description:** A powerful, universal desktop application for converting between 50+ image and metadata formats (including RAW, HDR, Web, and GIS formats). Built with Python and Tkinter, and powered by ImageMagick to provide the broadest possible format support while maintaining a highly responsive UI during batch operations.",
+  "main": "index.js",
+  "directories": {
+    "doc": "docs"
+  },
+  "scripts": {
+    "test": "echo \"Error: no test specified\" && exit 1"
+  },
+  "repository": {
+    "type": "git",
+    "url": "git+https://github.com/GameProgram7777/image-converter.git"
+  },
+  "keywords": [],
+  "author": "",
+  "license": "ISC",
+  "type": "commonjs",
+  "bugs": {
+    "url": "https://github.com/GameProgram7777/image-converter/issues"
+  },
+  "homepage": "https://github.com/GameProgram7777/image-converter#readme",
+  "devDependencies": {
+    "@playwright/test": "^1.61.1"
+  }
+}

playwright.config.js

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+const { defineConfig, devices } = require('@playwright/test');
+
+module.exports = defineConfig({
+  testDir: './tests',
+  fullyParallel: true,
+  forbidOnly: !!process.env.CI,
+  retries: process.env.CI ? 2 : 0,
+  workers: process.env.CI ? 1 : undefined,
+  reporter: 'html',
+  use: {
+    trace: 'on-first-retry',
+  },
+  projects: [
+    {
+      name: 'chromium',
+      use: { ...devices['Desktop Chrome'] },
+    },
+  ],
+});

tests/zip-generation.spec.js

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+const { test, expect } = require('@playwright/test');
+const path = require('path');
+const fs = require('fs');
+
+test('batch conversion zip generation failure increments failCount', async ({ page }) => {
+  // Use file:// protocol for reading local files instead of mocking localhost
+  const indexPath = path.resolve(__dirname, '../docs/index.html');
+
+  // Need to intercept the wasm initialization to prevent network requests,
+  // intercept jszip to mock failure, and intercept format_database.json for local resolution.
+  await page.route('**/*', async (route) => {
+    const url = route.request().url();
+    if (url.includes('format_database.json')) {
+      await route.fulfill({
+        body: fs.readFileSync(path.resolve(__dirname, '../docs/format_database.json'), 'utf8'),
+        contentType: 'application/json'
+      });
+    } else if (url.includes('jszip.min.js')) {
+      await route.fulfill({
+        body: `window.JSZip = class { file() {} generateAsync() { return Promise.reject(new Error("Mock failure")); } };`,
+        contentType: 'application/javascript'
+      });
+    } else {
+      await route.continue();
+    }
+  });
+
+  await page.goto(`file://${indexPath}`);
+
+  await page.waitForSelector('#convertBtn:not([disabled])', { timeout: 10000 });
+
+  const fileInput = await page.$('#fileInput');
+  await fileInput.setInputFiles([
+    path.resolve(__dirname, 'fixtures/dummy.png'),
+    path.resolve(__dirname, 'fixtures/dummy1.png')
+  ]);
+
+  await page.click('#convertBtn');
+
+  await page.waitForFunction(() => {
+    const status = document.getElementById('status').textContent;
+    return status.includes('Job complete!');
+  }, { timeout: 10000 });
+
+  const statusText = await page.locator('#status').textContent();
+  expect(statusText).toContain('Failed: 2');
+});