feat: pytest fixtures

[dmadisetti]

📝 Summary

Allows @pytest.fixture definitions in the same cell as the pytest cell + adds documentation for fixtures. E.g.

@pytest.fixture
def example():
    return 7

def uses_fixture(example):
    assert example == 7

Aside: Noticed a little bug in pytest, and realized that fixtures were not a large a lift as I initially thought.

closes #6560 #5231 #3569 + related #3683

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Project	Deployment	Review	Updated (UTC)
marimo-docs	Ready	Preview, Comment	Jan 2, 2026 5:14pm