test_markdown_cell is failing

[echarles]

This is the error details.

=================================== FAILURES ===================================
______________________________ test_markdown_cell ______________________________

prefill_notebook = <function prefill_notebook.<locals>.inner at 0x7fa4a899c940>

    def test_markdown_cell(prefill_notebook):
        notebook_frontend = prefill_notebook([new_markdown_cell(md) for md in [
            '# Foo', '**Bar**', '*Baz*', '```\nx = 1\n```', '```aaaa\nx = 1\n```',
            '```python\ns = "$"\nt = "$"\n```'
        ]])
    
>       assert get_rendered_contents(notebook_frontend) == [
            '<h1 id="Foo">Foo<a class="anchor-link" href="#Foo">¶</a></h1>',
            '<p><strong>Bar</strong></p>',
            '<p><em>Baz</em></p>',
            '<pre><code>x = 1</code></pre>',
            '<pre><code class="cm-s-ipython language-aaaa">x = 1</code></pre>',
            '<pre><code class="cm-s-ipython language-python">' +
            '<span class="cm-variable">s</span> <span class="cm-operator">=</span> <span class="cm-string">"$"</span>\n' +
            '<span class="cm-variable">t</span> <span class="cm-operator">=</span> <span class="cm-string">"$"</span></code></pre>'
        ]
E       assert ['<h1 id="Foo.../code></pre>'] == ['<h1 id="Foo.../code></pre>']
E         At index 3 diff: '<pre><code>x = 1\n</code></pre>' != '<pre><code>x = 1</code></pre>'
E         Full diff:
E           [
E            '<h1 id="Foo">Foo<a class="anchor-link" href="#Foo">¶</a></h1>',
E            '<p><strong>Bar</strong></p>',
E            '<p><em>Baz</em></p>',
E         -  '<pre><code>x = 1</code></pre>',
E         +  '<pre><code>x = 1\n'
E         +  '</code></pre>',
E         -  '<pre><code class="cm-s-ipython language-aaaa">x = 1</code></pre>',
E         ?                                                      ^^^^^^^^^^^^^ -
E         +  '<pre><code class="cm-s-ipython language-aaaa">x = 1\n'
E         ?                                                      ^^
E         +  '</code></pre>',
E            '<pre><code class="cm-s-ipython language-python"><span '
E            'class="cm-variable">s</span> <span class="cm-operator">=</span> <span '
E            'class="cm-string">"$"</span>\n'
E            '<span class="cm-variable">t</span> <span class="cm-operator">=</span> <span '
E         -  'class="cm-string">"$"</span></code></pre>',
E         ?                               ^^^^^^^^^^^^^ -
E         +  'class="cm-string">"$"</span>\n'
E         ?                               ^^
E         +  '</code></pre>',
E           ]

nbclassic/tests/end_to_end/test_markdown.py:26: AssertionError
=========================== short test summary info ============================
FAILED nbclassic/tests/end_to_end/test_markdown.py::test_markdown_cell - assert ['<h1 id="Foo.../code></pre>'] == ['<h1 id="Foo.../code></pre>']
  At index 3 diff: '<pre><code>x = 1\n</code></pre>' != '<pre><code>x = 1</code></pre>'
  Full diff:
    [
     '<h1 id="Foo">Foo<a class="anchor-link" href="#Foo">¶</a></h1>',
     '<p><strong>Bar</strong></p>',
     '<p><em>Baz</em></p>',
  -  '<pre><code>x = 1</code></pre>',
  +  '<pre><code>x = 1\n'
  +  '</code></pre>',
  -  '<pre><code class="cm-s-ipython language-aaaa">x = 1</code></pre>',
  ?                                                      ^^^^^^^^^^^^^ -
  +  '<pre><code class="cm-s-ipython language-aaaa">x = 1\n'
  ?                                                      ^^
  +  '</code></pre>',
     '<pre><code class="cm-s-ipython language-python"><span '
     'class="cm-variable">s</span> <span class="cm-operator">=</span> <span '
     'class="cm-string">"$"</span>\n'
     '<span class="cm-variable">t</span> <span class="cm-operator">=</span> <span '
  -  'class="cm-string">"$"</span></code></pre>',
  ?                               ^^^^^^^^^^^^^ -
  +  'class="cm-string">"$"</span>\n'
  ?                               ^^
  +  '</code></pre>',
    ]
=================== 1 failed, 30 passed in 269.13s (0:04:29) ===================
Error: Process completed