Update to Xeus 4.3.4

lite/requirements.txt

@@ -1,3 +1,3 @@
 jupyterlite==0.7.0
 jupyterlite-pyodide-kernel==0.7
-jupyterlite-xeus==4.2.0
+jupyterlite-xeus==4.3.4

ui-tests/playwright.config.js

@@ -15,7 +15,12 @@ module.exports = {
     autoGoto: false,
     baseURL: 'http://localhost:3000',
     trace: 'retain-on-failure',
-    video: 'retain-on-failure'
+    video: 'retain-on-failure',
+    screenshot: 'only-on-failure',
+    // Capture browser console logs
+    launchOptions: {
+      args: process.env.CI ? ['--disable-dev-shm-usage'] : []
+    }
   },
   webServer: {
     command: 'jlpm start',

ui-tests/tests/jupytereverywhere.spec.ts

@@ -1,3 +1,3 @@
 import { test, expect, Page } from '@playwright/test';
 import path from 'path';
 import fs from 'fs';
@@ -1044,16 +1044,37 @@
 });
 
 test('Should switch to R kernel and run R code', async ({ page }) => {
+  const consoleMessages: string[] = [];
+  const pageErrors: string[] = [];
+
+  page.on('console', msg => {
+    const text = `[${msg.type()}] ${msg.text()}`;
+    consoleMessages.push(text);
+    console.log(text);
+  });
+
+  page.on('pageerror', error => {
+    const errorText = `Page error: ${error.message}\n${error.stack}`;
+    pageErrors.push(errorText);
+    console.error(errorText);
+  });
+
+  page.on('crash', () => {
+    console.error('PAGE CRASHED!');
+  });
+
   await page.goto('lab/index.html');
   await page.waitForSelector('.jp-NotebookPanel');
 
+  // Wait for Python kernel to fully initialise
+  await page.waitForTimeout(30000);
+
   await runCommand(page, 'jupytereverywhere:switch-kernel', { kernel: 'xr' });
-  await page.waitForTimeout(10000);
-  await runCommand(page, 'notebook:insert-cell-below');
+  await page.waitForTimeout(30000);
 
   const code = 'lm(mpg ~ wt + hp + disp + cyl, data=mtcars)';
   const cell = page.locator('.jp-Cell').last();
   await cell.getByRole('textbox').fill(code);
 
   await runCommand(page, 'notebook:run-cell');
 
@@ -1074,6 +1095,25 @@
   const expectedContent = 'col1';
 
   test('R kernel should be able to fetch from a remote URL', async ({ page }) => {
+    const consoleMessages: string[] = [];
+    const pageErrors: string[] = [];
+
+    page.on('console', msg => {
+      const text = `[${msg.type()}] ${msg.text()}`;
+      consoleMessages.push(text);
+      console.log(text);
+    });
+
+    page.on('pageerror', error => {
+      const errorText = `Page error: ${error.message}\n${error.stack}`;
+      pageErrors.push(errorText);
+      console.error(errorText);
+    });
+
+    page.on('crash', () => {
+      console.error('PAGE CRASHED!');
+    });
+
     await page.goto('lab/index.html?kernel=r');
     await page.waitForSelector('.jp-NotebookPanel');
 
@@ -1084,7 +1124,7 @@
     await runCommand(page, 'notebook:run-cell');
 
     const output = cell.locator('.jp-Cell-outputArea');
     await expect(output).toBeVisible({
       timeout: 20000 // shouldn't take too long to run but just to be safe
     });