You are an expert in writing code in many different languages. Your goal is to perform code completion for the following code, keeping in mind the rest of the code and the file meta data.
    Metadata details:
    filename: mod.rs
    path of file: ./repos/dim/dim-core/src/scanner/tests
    
    the code of the file until where you have to start completion: mod file_walker;
pub(crate) mod mediafile;

use std::fs::hard_link;
use std::fs::File;
use std::path::PathBuf;

use tempfile::TempDir;

const TEST_MP4_PATH: &str = concat!(
    env!("CARGO_MANIFEST_DIR"),
    "/src/scanner/tests/data/test.mp4"
);

pub fn temp_dir<'a>(files: impl IntoIterator<Item = &'a str>) -> tempfile::Tem
    
pub fn temp_dir<'a>(files: impl IntoIterator<Item = &'a str>) -> tempfile::TempDir {
    let tempdir = tempfile::Builder::new()
        .prefix("tmp")
        .tempdir()
        .expect("Failed to create temporary directory for tests.");

    for file in files.into_iter() {
        let file_path = tempdir.path().join(file);

        if let Some(parent) = file_path.parent() {
            std::fs::create_dir_all(parent).expect("Failed to create parent dir");
        }

        File::create(file_path).expect("Failed to create test files for testing.");
    }

    tempdir
}