pub async fn test_list_files_with_deleted(op: Operator) -> Result<()> {
    if !op.info().full_capability().list_with_deleted {
        return Ok(());
    }

    let parent = TEST_FIXTURE.new_dir_path();
    let file_name = TEST_FIXTURE.new_file_path();
    let file_path = format!("{}{}", parent, file_name);
    op.write(file_path.as_str(), "1").await?;
    op.write(file_path.as_str(), "2").await?;
    op.delete(file_path.as_str()).await?;

    let file_path2 = format!("{}{}", parent, TEST_FIXTURE.new_file_path());
    op.write(file_path2.as_str(), "1").await?;

    let mut ds = op.list_with(&parent).deleted(true).await?;
    // this will fail !
    assert_eq!(ds.len(), 2);
}