def METHOD_NAME(nb_file, tmpdir, no_jupytext_version_number):
    cm = TextFileContentsManager()
    root, file = os.path.split(nb_file)
    py_file = str(tmpdir.join(file))
    shutil.copy(nb_file, py_file)
    cm.root_dir = str(tmpdir)
    model = cm.get(file)
    model["type"] == "notebook"
    cm.save(model, file)
    # Unsign notebook
    nb = model["content"]
    for cell in nb.cells:
        cell.metadata.pop("trusted", True)
    cm.notary.unsign(nb)
    # Trust and reload
    cm.trust_notebook(file)
    model = cm.get(file)
    for cell in model["content"].cells:
        assert cell.metadata.get("trusted", True)