@staticmethod
@pytest.fixture
def test_dataframe():
    df = pd.DataFrame({'index': [0, 1, 2], 'city': ['London', 'Sheffield', 'Brussels'], 'country': ['UK', 'United Kingdom', 'Belgium']})
    return df
@staticmethod
@pytest.fixture
def test_dataframe():
    df = pd.DataFrame({'index': [0, 1, 2], 'city': ['London', 'Sheffield', 'Brussels'], 'country': ['UK', 'United Kingdom', 'Belgium']})
    return df