我想测试这个函数：

def filter_df(df, column_name: str, skill: List):
    return df.query(f"{column_name} in {skill}")

这是我的考验：

def test_filter_df():
    df = pd.DataFrame({"col1": ["sap", "hi", "abc"], "col2": [3, 4, 4]})
    expected = pd.DataFrame({"col1": ["hi", "abc"], "col2": [4, 4]})
    assert_frame_equal(filter_df(df, "col1", ["hi", "abc"]), expected)

我得到一个assert_frame_equal(filter_df(df, "col1", ["hi", "abc"]), expected)错误，但我不明白为什么 Dataframe 不相同。