def METHOD_NAME(a_browser):
    a_browser.open(EMPTY_PAGE_URL)
    page_source_path = a_browser.get(query.page_source_saved())
    assert os.path.exists(page_source_path)
    assert os.path.isfile(page_source_path)
    assert page_source_path == os.path.join(
        a_browser.config.reports_folder,
        f'{next(browser.config._counter) - 1}.html',
    )