def test_markdown_pane_extensions(document, comm):
pane = Pane("""
```python
None
```
""")
# Create pane
model = pane.get_root(document, comm=comm)
assert pane._models[model.ref['id']][0] is model
assert model.text.startswith('<div class="codehilite')
pane.extensions = ["extra", "smarty"]
assert model.text.startswith('<pre><code class="python')
