1) tests/jupyterlab_mathjax2.spec.ts:3:5 › should display notebook mathjax2 equations ──────────── TypeError: Cannot read properties of null (reading 'evaluate') 19 | ); 20 | > 21 | await page.notebook.addCell( | ^ 22 | 'markdown', 23 | `$$ 24 | \\frac{1}{\\Bigl(\\sqrt{\\phi \\sqrt{5}}-\\phi\\Bigr) e^{\\frac25 \\pi}} = 1+\\frac{e^{-2\\pi}} {1+\\frac{e^{-4\\pi}} {1+\\frac{e^{-6\\pi}} {1+\\frac{e^{-8\\pi}} {1+\\cdots} } } } at NotebookHelper.getCellCount (/home/runner/work/jupyter-renderers/jupyter-renderers/packages/mathjax2-extension/ui-tests/node_modules/@jupyterlab/galata/src/helpers/notebook.ts:460:38) at NotebookHelper.addCell (/home/runner/work/jupyter-renderers/jupyter-renderers/packages/mathjax2-extension/ui-tests/node_modules/@jupyterlab/galata/src/helpers/notebook.ts:1083:22) at /home/runner/work/jupyter-renderers/jupyter-renderers/packages/mathjax2-extension/ui-tests/tests/jupyterlab_mathjax2.spec.ts:21:3

Process completed with exit code 1.

Node.js 16 actions are deprecated. Please update the following actions to use Node.js 20: actions/checkout@v3, actions/setup-python@v4, actions/cache@v3, actions/setup-node@v3, actions/download-artifact@v3, actions/upload-artifact@v3. For more information see: https://github.blog/changelog/2023-09-22-github-actions-transitioning-from-node-16-to-node-20/.