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    // Copyright 2015 The Rust Project Developers. See the COPYRIGHT
    // file at the top-level directory of this distribution and at
    // http://rust-lang.org/COPYRIGHT.
    //
    // Licensed under the Apache License, Version 2.0 <LICENSE-APACHE or
    // http://www.apache.org/licenses/LICENSE-2.0> or the MIT license
    // <LICENSE-MIT or http://opensource.org/licenses/MIT>, at your
    // option. This file may not be copied, modified, or distributed
    // except according to those terms.
    pub const DEFAULT_BUF_SIZE: usize = 8 * 1024;

    #[cfg(test)]
    #[allow(dead_code)] // not used on emscripten
    pub mod test {
        use path::{Path, PathBuf};
        use env;
        use rand::{self, Rng};
        use fs;

        pub struct TempDir(PathBuf);

        impl TempDir {
            pub fn join(&self, path: &str) -> PathBuf {
                let TempDir(ref p) = *self;
                p.join(path)
            }

            pub fn path<'a>(&'a self) -> &'a Path {
                let TempDir(ref p) = *self;
                p
            }
        }

        impl Drop for TempDir {
            fn drop(&mut self) {
                // Gee, seeing how we're testing the fs module I sure hope that we
                // at least implement this correctly!
                let TempDir(ref p) = *self;
                fs::remove_dir_all(p).unwrap();
            }
        }

        pub fn tmpdir() -> TempDir {
            let p = env::temp_dir();
            let mut r = rand::thread_rng();
            let ret = p.join(&format!("rust-{}", r.next_u32()));
            fs::create_dir(&ret).unwrap();
            TempDir(ret)
        }
    }

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