✅(e2e) add test for accessible html export from export modal

checks generated zip contains html and embedded media files

Signed-off-by: Cyril <c.gromoff@gmail.com>

Author: Ovgodd

CHANGELOG.md

@@ -16,6 +16,8 @@ and this project adheres to
 - ⚡️(sw) stop to cache external resources likes videos #1655
 - 💥(frontend) upgrade to ui-kit v2
 - ⚡️(frontend) improve perf on upload and table of contents #1662
+- ⚡️Enhance/html copy to download #1669
+
 
 ### Fixed
 

src/frontend/apps/e2e/__tests__/app-impress/doc-export.spec.ts

@@ -187,6 +187,64 @@ test.describe('Doc Export', () => {
     expect(download.suggestedFilename()).toBe(`${randomDoc}.odt`);
   });
 
+  test('it exports the doc to html zip', async ({ page, browserName }) => {
+    const [randomDoc] = await createDoc(
+      page,
+      'doc-editor-html-zip',
+      browserName,
+      1,
+    );
+
+    await verifyDocName(page, randomDoc);
+
+    // Add some content and at least one image so that the ZIP contains media files.
+    await page.locator('.ProseMirror.bn-editor').click();
+    await page.locator('.ProseMirror.bn-editor').fill('Hello HTML ZIP');
+
+    await page.keyboard.press('Enter');
+    await page.locator('.bn-block-outer').last().fill('/');
+    await page.getByText('Resizable image with caption').click();
+
+    const fileChooserPromise = page.waitForEvent('filechooser');
+    await page.getByText('Upload image').click();
+
+    const fileChooser = await fileChooserPromise;
+    await fileChooser.setFiles(path.join(__dirname, 'assets/test.svg'));
+
+    const image = page
+      .locator('.--docs--editor-container img.bn-visual-media')
+      .first();
+
+    await expect(image).toBeVisible();
+
+    await page
+      .getByRole('button', {
+        name: 'Export the document',
+      })
+      .click();
+
+    await page.getByRole('combobox', { name: 'Format' }).click();
+    await page.getByRole('option', { name: 'HTML' }).click();
+
+    await expect(page.getByTestId('doc-export-download-button')).toBeVisible();
+
+    const downloadPromise = page.waitForEvent('download', (download) => {
+      return download.suggestedFilename().includes(`${randomDoc}.zip`);
+    });
+
+    void page.getByTestId('doc-export-download-button').click();
+
+    const download = await downloadPromise;
+    expect(download.suggestedFilename()).toBe(`${randomDoc}.zip`);
+
+    const zipBuffer = await cs.toBuffer(await download.createReadStream());
+
+    // ZIP files start with "PK\x03\x04"
+    expect(zipBuffer.length).toBeGreaterThan(4);
+    expect(zipBuffer[0]).toBe(0x50);
+    expect(zipBuffer[1]).toBe(0x4b);
+  });
+
   /**
    * This test tell us that the export to pdf is working with images
    * but it does not tell us if the images are being displayed correctly