diff --git a/.github/workflows/build.yml b/.github/workflows/build.yml
index 0d73ce13..40fe764d 100644
--- a/.github/workflows/build.yml
+++ b/.github/workflows/build.yml
@@ -212,6 +212,8 @@ jobs:
     name: Integration tests
     needs: lite
     runs-on: ubuntu-latest
+    permissions:
+      contents: read
 
     env:
       PLAYWRIGHT_BROWSERS_PATH: ${{ github.workspace }}/pw-browsers
@@ -219,10 +221,24 @@ jobs:
     steps:
     - name: Checkout
       uses: actions/checkout@v4
+      with:
+        persist-credentials: false
 
     - name: Base Setup
       uses: jupyterlab/maintainer-tools/.github/actions/base-setup@v1
 
+    - name: Set up Docker Compose
+      uses: docker/setup-compose-action@v1
+      with:
+        cache-binary: true
+
+    - name: Checkout CKHub sharing service
+      uses: actions/checkout@v4
+      with:
+        repository: jupytereverywhere/sharing-service
+        path: ckhub-sharing-service
+        persist-credentials: false
+
     - name: Download lite app (test mode)
       uses: actions/download-artifact@v4
       with:
@@ -252,9 +268,15 @@ jobs:
       run: jlpm playwright install chromium
       working-directory: ui-tests
 
-    - name: Execute integration tests
-      working-directory: ui-tests
+    - name: Start CKHub sharing service and execute integration tests
       run: |
+        echo "::group::Starting CKHub sharing service"
+        cd ckhub-sharing-service
+        docker compose up --build --detach
+        cd ..
+        echo "::endgroup::"
+
+        cd ui-tests
         jlpm playwright test --browser chromium
 
     - name: Upload Playwright Test report
diff --git a/ui-tests/tests/sharing-service.spec.ts b/ui-tests/tests/sharing-service.spec.ts
new file mode 100644
index 00000000..16bbb6b1
--- /dev/null
+++ b/ui-tests/tests/sharing-service.spec.ts
@@ -0,0 +1,113 @@
+import { test, expect, Page } from '@playwright/test';
+import type { JupyterLab } from '@jupyterlab/application';
+import type { JSONObject } from '@lumino/coreutils';
+
+declare global {
+  interface Window {
+    jupyterapp: JupyterLab;
+  }
+}
+
+async function runCommand(page: Page, command: string, args: JSONObject = {}) {
+  await page.evaluate(
+    async ({ command, args }) => {
+      await window.jupyterapp.commands.execute(command, args);
+    },
+    { command, args }
+  );
+}
+
+const TEST_NOTEBOOK = {
+  cells: [
+    {
+      cell_type: 'code',
+      execution_count: null,
+      id: 'test-cell-1',
+      outputs: [],
+      metadata: {},
+      source: ['print("Hello from CKHub shared notebook!")']
+    },
+    {
+      cell_type: 'markdown',
+      id: 'test-cell-2',
+      metadata: {},
+      source: ['# Test Markdown Cell\n\nThis is a test notebook for sharing.']
+    }
+  ],
+  metadata: {
+    kernelspec: {
+      display_name: 'Python 3 (ipykernel)',
+      language: 'python',
+      name: 'python3'
+    },
+    language_info: {
+      name: 'python',
+      version: '3.8.0'
+    }
+  },
+  nbformat: 4,
+  nbformat_minor: 5
+};
+
+async function createTestNotebook(page: Page): Promise<void> {
+  await page.evaluate(notebookContent => {
+    const { serviceManager } = window.jupyterapp;
+    return serviceManager.contents.save('test-notebook.ipynb', {
+      type: 'notebook',
+      format: 'json',
+      content: notebookContent
+    });
+  }, TEST_NOTEBOOK);
+}
+
+async function openTestNotebook(page: Page): Promise<void> {
+  await runCommand(page, 'docmanager:open', { path: 'test-notebook.ipynb' });
+}
+
+async function extractShareUrlFromDialog(page: Page): Promise<string> {
+  const shareUrlElement = await page.waitForSelector('.je-share-link', { timeout: 10000 });
+  const shareUrl = await shareUrlElement.textContent();
+
+  if (!shareUrl) {
+    throw new Error('Share URL not found in dialog');
+  }
+
+  return shareUrl.trim();
+}
+
+async function getCellContent(page: Page, cellIndex: number = 0): Promise<string> {
+  return await page.evaluate(index => {
+    const cells = document.querySelectorAll('.jp-Cell');
+    const cell = cells[index];
+    if (!cell) return '';
+
+    const content = cell.querySelector('.cm-content');
+    return content?.textContent || '';
+  }, cellIndex);
+}
+
+test.beforeEach(async ({ page }) => {
+  await page.goto('lab/index.html');
+  await page.waitForSelector('.jp-LabShell');
+});
+
+test.describe('A functional test for the sharing service', () => {
+  test('Perform round-trip with sharing service', async ({ page, context }) => {
+    await createTestNotebook(page);
+    await openTestNotebook(page);
+    await runCommand(page, 'jupytereverywhere:share-notebook');
+
+    const shareUrl = await extractShareUrlFromDialog(page);
+
+    const sharedPage = await context.newPage();
+    await sharedPage.goto(shareUrl);
+    await sharedPage.waitForSelector('.jp-LabShell');
+
+    await runCommand(sharedPage, 'jupytereverywhere:create-copy-notebook');
+
+    // Wait for view-only header to disappear
+    await expect(sharedPage.locator('.je-ViewOnlyHeader')).toBeHidden({ timeout: 10000 });
+
+    await sharedPage.close();
+  });
+});