def test_can_uncheck_a_checkbox(browser, app_url):
    """should provide a way to uncheck a radio checkbox"""
    browser.visit(app_url)
    elem = browser.find_by_name("checked-checkbox")
    assert elem.checked
    elem.uncheck()
    assert not elem.checked
should provide a way to uncheck a radio checkbox
tests/test_all_drivers/test_form_elements.py