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def test_no_errors_or_warnings_in_output(notebook):
    with open(notebook) as fp:
        nb = nbformat.read(fp, nbformat.NO_CONVERT)
        for cell in nb.cells:
            if cell.cell_type == "code":
                for output in cell.outputs:
                    if "name" in output and output["name"] == "stderr":
                        raise AssertionError(output["text"])

# pylint: disable=wrong-import-position
# https://bugs.python.org/issue37373
import sys

if sys.platform == "win32" and sys.version_info[:2] >= (3, 7):
    import asyncio

    asyncio.set_event_loop_policy(asyncio.WindowsSelectorEventLoopPolicy())