mfio-rt 0.1.0

//! mfio-rt test suite.
//!
//! This module contains all blocks needed for testing [`Fs`] and [`Tcp`] implementations in a
//! standard, extensive way. The main entry point for using the test suite are the
//! [`test_suite!`](crate::test_suite!) and [`net_test_suite!`](crate::net_test_suite!) macros.

use crate::util::diff_paths;
pub use crate::{DirHandle, DirHandleExt, Fs, OpenOptions, Path, Shutdown};
pub use alloc::{
    collections::BTreeSet,
    format,
    string::{String, ToString},
    vec,
    vec::Vec,
};
pub use core::future::Future;
pub use futures::StreamExt;
pub use mfio::backend::IoBackendExt;
pub use mfio::traits::{IoRead, IoWrite};
pub use once_cell::sync::Lazy;
pub use tempdir::TempDir;

#[cfg(feature = "std")]
pub use crate::{Tcp, TcpListenerHandle, TcpStreamHandle};
#[cfg(feature = "std")]
pub use std::fs;

const FILES: &[(&str, &str)] = &[
    ("Cargo.toml", include_str!("../Cargo.toml")),
    ("src/lib.rs", include_str!("lib.rs")),
    ("src/util.rs", include_str!("util.rs")),
    ("src/native/mod.rs", include_str!("native/mod.rs")),
    (
        "src/native/impls/mod.rs",
        include_str!("native/impls/mod.rs"),
    ),
    (
        "src/native/impls/thread.rs",
        include_str!("native/impls/thread.rs"),
    ),
    (
        "src/native/impls/unix_extra.rs",
        include_str!("native/impls/unix_extra.rs"),
    ),
    ("p1/p2/p3/a.txt", "TEST TEST TEST"),
];

const DIRECTORIES: &[&str] = &[
    "src/native/impls/io_uring",
    "src/native/impls/mio",
    "p1/p2/p3/p4/p5/p6",
];

pub static CTX: Lazy<TestCtx> = Lazy::new(TestCtx::new);

#[cfg(not(miri))]
const fn hash(mut x: u64) -> u64 {
    x = (x ^ (x >> 30)).wrapping_mul(0xbf58476d1ce4e5b9u64);
    x = (x ^ (x >> 27)).wrapping_mul(0x94d049bb133111ebu64);
    x ^ (x >> 31)
}

pub struct TestCtx {
    files: Vec<(String, Vec<u8>)>,
    dirs: Vec<String>,
}

impl Default for TestCtx {
    fn default() -> Self {
        Self::new()
    }
}

impl TestCtx {
    pub fn new() -> Self {
        let mut files = vec![];

        for (p, c) in FILES {
            files.push((p.to_string(), c.to_string().into_bytes()));
        }

        let mut dirs = vec![];

        for d in DIRECTORIES {
            dirs.push(d.to_string());
        }

        // Create a few "large" random files

        #[cfg(not(miri))]
        for f in 0..4 {
            files.push((
                format!("large/{f}"),
                (0..0x4000000)
                    .map(|v| hash((v as u64) << (f * 8)) as u8)
                    .collect::<Vec<_>>(),
            ))
        }

        Self { files, dirs }
    }

    pub fn list(&self, path: &str) -> BTreeSet<String> {
        let path = path.trim_start_matches('.').trim_start_matches('/');
        self.files
            .iter()
            .map(|v| v.0.as_str())
            .filter_map(move |v| v.strip_prefix(path))
            .map(|v| v.trim_start_matches('/'))
            .map(|v| v.split_once('/').map(|(a, _)| a).unwrap_or(v))
            .chain(
                self.dirs
                    .iter()
                    .map(|v| v.as_str())
                    .filter_map(move |v| v.strip_prefix(path))
                    .map(|v| v.trim_start_matches('/'))
                    .map(|v| v.split_once('/').map(|(a, _)| a).unwrap_or(v)),
            )
            .filter(|s| !s.is_empty())
            .map(|s| s.to_string())
            .collect()
    }

    pub fn dirs(&self) -> &[String] {
        &self.dirs
    }

    pub fn files(&self) -> &[(String, Vec<u8>)] {
        &self.files
    }

    pub fn all_dirs(&self) -> BTreeSet<String> {
        let mut dirs = BTreeSet::new();

        for dir in &self.dirs {
            let mut d = ".".to_string();
            dirs.insert(d.clone());
            for p in dir.split('/') {
                d.push('/');
                d.push_str(p);
                dirs.insert(d.clone());
            }
        }

        for dir in self
            .files
            .iter()
            .filter_map(|(a, _)| a.rsplit_once('/').map(|(a, _)| a))
        {
            let mut d = ".".to_string();
            dirs.insert(d.clone());
            for p in dir.split('/') {
                d.push('/');
                d.push_str(p);
                dirs.insert(d.clone());
            }
        }

        dirs
    }

    #[cfg(feature = "std")]
    pub fn build_in_path(&self, path: &Path) {
        for d in &self.dirs {
            let _ = fs::create_dir_all(path.join(d));
        }

        for (p, data) in &self.files {
            if let Some((d, _)) = p.rsplit_once('/') {
                let _ = fs::create_dir_all(path.join(d));
            }
            fs::write(path.join(p), data).unwrap();
        }
    }

    pub async fn build_in_fs(&self, fs: &impl Fs) {
        let cdir = fs.current_dir();

        for d in &self.dirs {
            #[cfg(feature = "std")]
            println!("Dir: {d:?}");
            let _ = cdir.create_dir_all(d).await;
        }

        for (p, data) in &self.files {
            #[cfg(feature = "std")]
            println!("File: {p:?}");
            if let Some((d, _)) = p.rsplit_once('/') {
                let _ = cdir.create_dir_all(d).await;
            }
            let file = cdir
                .open_file(p, OpenOptions::new().create_new(true).write(true))
                .await
                .unwrap();
            file.write_all(0, &data[..]).await.unwrap();
        }
    }
}

#[cfg(feature = "std")]
pub mod net {
    use super::*;
    use async_semaphore::Semaphore;
    use core::pin::pin;

    /// Maximum number of concurrent TCP tests (listener, client) pairs at a time.
    static TCP_SEM: Semaphore = Semaphore::new(16);

    pub struct NetTestRun<'a, T> {
        ctx: &'static TestCtx,
        rt: &'a T,
    }

    impl<'a, T: Tcp> NetTestRun<'a, T> {
        pub fn new(rt: &'a T) -> Self {
            Self { ctx: &*CTX, rt }
        }

        pub async fn tcp_connect(&self) {
            use std::net::TcpListener;

            let _sem = TCP_SEM.acquire().await;

            let listener = TcpListener::bind("127.0.0.1:0").unwrap();
            let addr = listener.local_addr().unwrap();

            let jh = std::thread::spawn(move || {
                let _ = listener.accept().unwrap();
            });

            self.rt.connect(addr).await.unwrap();

            jh.join().unwrap();
        }

        pub async fn tcp_listen(&self) {
            use std::net::TcpStream;

            let _sem = TCP_SEM.acquire().await;

            let listener = self.rt.bind("127.0.0.1:0").await.unwrap();
            let addr = listener.local_addr().unwrap();

            let jh = std::thread::spawn(move || {
                let _ = TcpStream::connect(addr).unwrap();
            });

            let mut listener = pin!(listener);

            let _ = listener.next().await.unwrap();

            jh.join().unwrap();
        }

        pub fn tcp_receive(&self) -> impl Iterator<Item = impl Future<Output = ()> + '_> + '_ {
            use mfio::io::NoPos;
            use std::net::TcpListener;

            self.ctx.files.iter().map(move |(name, data)| async move {
                let _sem = TCP_SEM.acquire().await;

                let listener = TcpListener::bind("127.0.0.1:0").unwrap();
                let addr = listener.local_addr().unwrap();

                let (tx, rx) = flume::bounded(1);

                let jh = std::thread::spawn(move || {
                    use std::io::Write;
                    let (mut sock, _) = listener.accept().unwrap();
                    sock.write_all(data).unwrap();
                    let _ = sock.shutdown(std::net::Shutdown::Both);
                    let _ = tx.send(());
                });

                let conn = self.rt.connect(addr).await.unwrap();

                let mut out = vec![];
                conn.read_to_end(NoPos::new(), &mut out).await.unwrap();
                assert!(
                    &out[..] == data,
                    "{name} does not match ({} vs {})",
                    out.len(),
                    data.len()
                );

                let _ = rx.recv_async().await;
                jh.join().unwrap();
            })
        }

        pub fn tcp_send(&self) -> impl Iterator<Item = impl Future<Output = ()> + '_> + '_ {
            use mfio::io::NoPos;
            use std::net::TcpListener;

            self.ctx.files.iter().map(move |(name, data)| async move {
                let _sem = TCP_SEM.acquire().await;

                let listener = TcpListener::bind("127.0.0.1:0").unwrap();
                let addr = listener.local_addr().unwrap();

                let (tx, rx) = flume::bounded(1);

                let jh = std::thread::spawn(move || {
                    use std::io::Read;
                    let (mut sock, _) = listener.accept().unwrap();
                    let mut out = vec![];
                    sock.read_to_end(&mut out).unwrap();
                    let _ = tx.send(());
                    out
                });

                {
                    let conn = self.rt.connect(addr).await.unwrap();
                    conn.write_all(NoPos::new(), &data[..]).await.unwrap();
                    core::mem::drop(conn);
                }

                let _ = rx.recv_async().await;

                let ret = jh.join().unwrap();
                assert!(
                    &ret == data,
                    "{name} does not match ({} vs {})",
                    ret.len(),
                    data.len()
                );
            })
        }

        pub fn tcp_echo_client(&self) -> impl Iterator<Item = impl Future<Output = ()> + '_> + '_ {
            use mfio::io::NoPos;
            use std::net::TcpListener;

            self.ctx.files.iter().map(move |(name, data)| async move {
                let _sem = TCP_SEM.acquire().await;

                let listener = TcpListener::bind("127.0.0.1:0").unwrap();
                let addr = listener.local_addr().unwrap();

                let (tx, rx) = flume::bounded(1);

                let jh = std::thread::spawn(move || {
                    let (sock, _) = listener.accept().unwrap();
                    log::trace!("Echo STD server start");
                    std::io::copy(&mut &sock, &mut &sock).unwrap();
                    log::trace!("Echo STD server end");
                    let _ = tx.send(());
                });

                let ret = {
                    let conn = self.rt.connect(addr).await.unwrap();

                    let write = async {
                        conn.write_all(NoPos::new(), &data[..]).await.unwrap();
                        log::trace!("Written");
                        conn.shutdown(Shutdown::Write).unwrap();
                    };

                    let read = async {
                        let mut ret = vec![];
                        conn.read_to_end(NoPos::new(), &mut ret).await.unwrap();
                        ret
                    };

                    futures::join!(write, read).1
                };

                let _ = rx.recv_async().await;
                jh.join().unwrap();

                assert!(
                    &ret == data,
                    "{name} does not match ({} vs {})",
                    ret.len(),
                    data.len()
                );
            })
        }

        pub fn tcp_echo_server(&self) -> impl Iterator<Item = impl Future<Output = ()> + '_> + '_ {
            use core::mem::MaybeUninit;
            use flume::SendError;
            use mfio::io::{Read, StreamIoExt, VecPacket};
            use std::net::TcpStream;

            self.ctx.files.iter().map(move |(name, data)| async move {
                let _sem = TCP_SEM.acquire().await;

                let listener = self.rt.bind("127.0.0.1:0").await.unwrap();
                let addr = listener.local_addr().unwrap();

                let (tx, rx) = flume::bounded(1);

                let jh = std::thread::spawn(move || {
                    use std::io::{Read, Write};
                    let sock = TcpStream::connect(addr).unwrap();
                    let sock = std::sync::Arc::new(sock);

                    let jh = std::thread::spawn({
                        let sock = sock.clone();
                        move || {
                            (&mut &*sock).write_all(data).unwrap();
                            sock.shutdown(Shutdown::Write.into()).unwrap();
                        }
                    });

                    let mut out = vec![];
                    let _ = (&mut &*sock).read_to_end(&mut out);

                    jh.join().unwrap();
                    let _ = tx.send(());

                    out
                });

                let mut listener = pin!(listener);

                let (sock, _) = listener.next().await.unwrap();

                // TODO: we need a much simpler std::io::copy equivalent...
                let (rtx, rrx) = flume::bounded(4);
                let (mtx, mrx) = flume::bounded(4);

                for i in 0..rtx.capacity().unwrap() {
                    let _ = rtx.send_async((i, vec![MaybeUninit::uninit(); 64])).await;
                }

                let read = {
                    let sock = &sock;
                    async move {
                        rrx.stream()
                            .then(|(i, mut v)| async move {
                                v.resize(v.len() * 2, MaybeUninit::uninit());
                                let p = VecPacket::from(v);
                                let p = sock.stream_io(p).await;
                                let len = p.simple_contiguous_slice().unwrap().len();
                                let mut v = p.take();
                                let v = unsafe {
                                    v.set_len(len);
                                    core::mem::transmute::<Vec<MaybeUninit<u8>>, Vec<u8>>(v)
                                };
                                if v.is_empty() {
                                    log::trace!("Empty @ {i}");
                                    Err(SendError((i, v)))
                                } else {
                                    log::trace!("Forward {i}");
                                    Ok((i, v))
                                }
                            })
                            .take_while(|v| core::future::ready(v.is_ok()))
                            .forward(mtx.sink())
                            .await
                    }
                };

                let write = async {
                    let sock = &sock;
                    let rtx = &rtx;
                    mrx.stream()
                        .for_each(|(i, v)| async move {
                            let p = VecPacket::<Read>::from(v);
                            let p = sock.stream_io(p).await;
                            let mut v = p.take();
                            let v = unsafe {
                                v.set_len(v.capacity());
                                core::mem::transmute::<Vec<u8>, Vec<MaybeUninit<u8>>>(v)
                            };
                            log::trace!("Forward back {i}");
                            // We can't use stream.forward(), because that might cancel the .then() in
                            // unfinished state.
                            let _ = rtx.send_async((i, v)).await;
                        })
                        .await
                };

                let _ = futures::join!(read, write);
                log::trace!("Echo server");
                core::mem::drop(sock);

                let _ = rx.recv_async().await;
                let ret = jh.join().unwrap();

                assert!(
                    &ret == data,
                    "{name} does not match ({} vs {})",
                    ret.len(),
                    data.len()
                );
            })
        }
    }
}

pub struct TestRun<'a, T, D> {
    ctx: &'a TestCtx,
    rt: &'a T,
    _drop_guard: D,
}

#[cfg(feature = "std")]
impl<'a, T: Fs> TestRun<'a, T, TempDir> {
    pub fn new(rt: &'a T, dir: TempDir) -> Self {
        CTX.build_in_path(dir.path());
        Self {
            rt,
            _drop_guard: dir,
            ctx: &CTX,
        }
    }
}

impl<'a, T: Fs, D> TestRun<'a, T, D> {
    pub async fn built_by_rt(rt: &'a T, drop_guard: D) -> TestRun<'a, T, D> {
        CTX.build_in_fs(rt).await;
        Self {
            rt,
            _drop_guard: drop_guard,
            ctx: &CTX,
        }
    }

    pub fn assume_built(rt: &'a T, drop_guard: D) -> TestRun<'a, T, D> {
        Self {
            rt,
            _drop_guard: drop_guard,
            ctx: &CTX,
        }
    }

    pub fn files_equal(&self) -> impl Iterator<Item = impl Future<Output = ()> + '_> + '_ {
        self.ctx.files.iter().map(move |(p, data)| async move {
            let cur_dir = self.rt.current_dir().path().await.unwrap();
            let path = &cur_dir.join(p);
            let fh = self
                .rt
                .open(path, OpenOptions::new().read(true))
                .await
                .unwrap();
            let mut buf = vec![];
            fh.read_to_end(0, &mut buf).await.unwrap();
            assert!(&buf == data, "File {p} does not match!");
        })
    }

    pub fn files_equal_rel(&self) -> impl Iterator<Item = impl Future<Output = ()> + '_> + '_ {
        self.ctx.files.iter().map(move |(p, data)| async move {
            let cur_dir = self.rt.current_dir().path().await.unwrap();
            let path = &cur_dir.join(p);
            let dh = self
                .rt
                .current_dir()
                .open_dir(path.parent().unwrap())
                .await
                .unwrap();
            let fh = dh
                .open_file(path.file_name().unwrap(), OpenOptions::new().read(true))
                .await
                .unwrap();
            let mut buf = vec![];
            fh.read_to_end(0, &mut buf).await.unwrap();
            if &buf != data && buf.len() == data.len() {
                for (i, (a, b)) in buf.iter().zip(data.iter()).enumerate() {
                    if a != b {
                        panic!(
                            "File {p} does not match at {i}\n{:?}\n{:?}",
                            &buf[i..(i + 20)],
                            &data[i..(i + 20)]
                        );
                    }
                }
            }
            //assert!(&buf == data, "File {p} does not match! ({:x} vs {:x}) ({:?} {:?})", buf.len(), data.len(), &buf[..128], &data[..128]);
        })
    }

    pub fn writes_equal<'b>(
        &'b self,
        tdir: &'b Path,
    ) -> impl Iterator<Item = impl Future<Output = ()> + 'b> + 'b {
        self.ctx.files.iter().map(move |(p, data)| async move {
            let tdir = self.rt.current_dir().path().await.unwrap().join(tdir);
            let path = &tdir.join(p);
            self.rt
                .current_dir()
                .create_dir_all(path.parent().unwrap())
                .await
                .unwrap();

            let fh = self
                .rt
                .open(path, OpenOptions::new().create(true).write(true))
                .await
                .unwrap();

            fh.write_all(0, &data[..]).await.unwrap();

            core::mem::drop(fh);

            let fh = self
                .rt
                .open(path, OpenOptions::new().read(true))
                .await
                .unwrap();

            let mut buf = vec![];
            fh.read_to_end(0, &mut buf).await.unwrap();

            assert_eq!(core::str::from_utf8(&buf), core::str::from_utf8(data));
            assert!(&buf == data, "File {p} does not match!");
        })
    }

    pub fn writes_equal_rel<'b>(
        &'b self,
        tdir: &'b Path,
    ) -> impl Iterator<Item = impl Future<Output = ()> + 'b> + 'b {
        self.ctx.files.iter().map(move |(p, data)| async move {
            let tdir = self.rt.current_dir().path().await.unwrap().join(tdir);
            let path = &tdir.join(p);
            self.rt
                .current_dir()
                .create_dir_all(path.parent().unwrap())
                .await
                .unwrap();

            let dh = self
                .rt
                .current_dir()
                .open_dir(path.parent().unwrap())
                .await
                .unwrap();

            let filename = path.file_name().unwrap();

            let fh = dh
                .open_file(filename, OpenOptions::new().create(true).write(true))
                .await
                .unwrap();

            fh.write_all(0, &data[..]).await.unwrap();

            core::mem::drop(fh);

            let fh = dh
                .open_file(filename, OpenOptions::new().read(true))
                .await
                .unwrap();

            let mut buf = vec![];
            fh.read_to_end(0, &mut buf).await.unwrap();

            assert!(&buf == data, "File {p} does not match!");
        })
    }

    pub fn dirs_equal(&self) -> impl Iterator<Item = impl Future<Output = ()> + '_> + '_ {
        let all_dirs = self.ctx.all_dirs();
        log::error!("{all_dirs:?}");
        all_dirs.into_iter().map(move |d| async move {
            let cur_path = self.rt.current_dir().path().await.unwrap();
            log::error!("Join with {d}");
            let path = &cur_path.join(&d);
            log::error!("Open dir: {path:?}");
            let dh = self
                .rt
                .current_dir()
                .open_dir(path)
                .await
                .unwrap_or_else(|_| panic!("{path:?}"));
            log::error!("Opened dir: {path:?}");
            let dir = dh
                .read_dir()
                .await
                .unwrap()
                .map(|v| v.unwrap().name)
                .collect::<BTreeSet<String>>()
                .await;
            assert_eq!(dir, self.ctx.list(&d), "{d}");
        })
    }

    pub fn walk_dirs(&self) -> impl Iterator<Item = impl Future<Output = ()> + '_> + '_ {
        let curdir = self.rt.current_dir();
        self.ctx.all_dirs().into_iter().flat_map(move |d1| {
            self.ctx.all_dirs().into_iter().map(move |d2| {
                let d1 = d1.clone();
                async move {
                    let cur_path = curdir.path().await.unwrap();
                    let path1 = &cur_path.join(&d1);
                    let path2 = &cur_path.join(&d2);

                    let relpath1 = diff_paths(path1, path2).unwrap();
                    let relpath2 = diff_paths(&d1, &d2).unwrap();
                    assert_eq!(&relpath1, &relpath2);

                    let dh1 = curdir.open_dir(path1).await.unwrap();
                    let dh2 = curdir.open_dir(path2).await.unwrap();

                    let relpath3 =
                        diff_paths(dh1.path().await.unwrap(), dh2.path().await.unwrap()).unwrap();

                    assert_eq!(&relpath1, &relpath3);
                }
            })
        })
    }
}

async fn seq(i: impl Iterator<Item = impl Future<Output = ()> + '_> + '_) {
    for i in i {
        i.await;
    }
}

async fn con(i: impl Iterator<Item = impl Future<Output = ()> + '_> + '_) {
    let unordered = i.collect::<futures::stream::FuturesUnordered<_>>();
    unordered.count().await;
}

pub mod fs_tests {
    use super::*;

    pub async fn all_tests_seq(run: TestRun<'_, impl Fs, impl Sized>) {
        seq(run.files_equal()).await;
        seq(run.files_equal_rel()).await;
        seq(run.dirs_equal()).await;
        seq(run.walk_dirs()).await;
        let tdir = Path::new("mfio-testsuite-writes");
        let tdir2 = Path::new("mfio-testsuite-writes2");
        seq(run.writes_equal(tdir)).await;
        seq(run.writes_equal_rel(tdir2)).await;
    }

    pub async fn all_tests_con(run: TestRun<'_, impl Fs, impl Sized>) {
        futures::join! {
            con(run.files_equal()),
            con(run.files_equal_rel()),
            con(run.dirs_equal()),
            con(run.walk_dirs()),
        };
        // We cannot put writes concurrently, because we are creating new directories, which are
        // not expected by other tests.
        let tdir = Path::new("mfio-testsuite-writes");
        let tdir2 = Path::new("mfio-testsuite-writes2");
        futures::join! {
            seq(run.writes_equal(tdir)),
            seq(run.writes_equal_rel(tdir2)),
        };
    }

    pub async fn files_equal(run: TestRun<'_, impl Fs, impl Sized>) {
        seq(run.files_equal()).await;
    }

    pub async fn files_equal_rel(run: TestRun<'_, impl Fs, impl Sized>) {
        seq(run.files_equal_rel()).await;
    }

    pub async fn dirs_equal(run: TestRun<'_, impl Fs, impl Sized>) {
        seq(run.dirs_equal()).await;
    }

    pub async fn walk_dirs(run: TestRun<'_, impl Fs, impl Sized>) {
        seq(run.walk_dirs()).await;
    }

    pub async fn writes_equal(run: TestRun<'_, impl Fs, impl Sized>) {
        let tdir = Path::new("mfio-testsuite-writes");
        seq(run.writes_equal(tdir)).await;
    }

    pub async fn writes_equal_rel(run: TestRun<'_, impl Fs, impl Sized>) {
        let tdir = Path::new("mfio-testsuite-writes");
        seq(run.writes_equal_rel(tdir)).await;
    }
}

/// Builds filesystem test suite.
///
/// Unlike [`test_suite!`](crate::test_suite!), this function does not include any tests, and they
/// must be added manually. Please see the [`fs_tests`] module for a list of available tests.
///
/// The first parameter of the macro is the name of the generated module, while the second one
/// contains a closure containing the test name and an asynchronous closure to be executed.
///
/// The third argument an onwards is a comma separated list of tests to run.
///
/// The closure that runs contains the entire test_suite modules. It accepts a `&'static mut T`,
/// where `T: Fs`. To get a static ref, use the `staticify` function. It is unsound, but necessary
/// to make test suite generation code ergonomic.
///
/// # Examples
///
/// ```no_run
/// use mfio_rt::*;
///
/// test_suite_base!(tests_default, |test_name, closure| {
///     let _ = ::env_logger::builder().is_test(true).try_init();
///     let mut rt = NativeRt::default();
///     let rt = staticify(&mut rt);
///     let dir = TempDir::new(test_name).unwrap();
///     rt.set_cwd(dir.path().to_path_buf());
///     rt.run(move |rt| {
///         let run = TestRun::new(rt, dir);
///         closure(run)
///     });
/// },
///     dirs_equal,
///     files_equal
/// );
/// ```
#[macro_export]
macro_rules! test_suite_base {
    ($test_ident:ident, $fs_builder:expr, $($(#[cfg($meta:meta)])* $test:ident),*) => {
        #[cfg(test)]
        #[allow(clippy::redundant_closure_call)]
        mod $test_ident {
            use $crate::test_suite::*;

            fn staticify<T>(val: &mut T) -> &'static mut T {
                unsafe { core::mem::transmute(val) }
            }

            macro_rules! impl_test {
                ($name:ident) => {
                    #[test]
                    fn $name() {
                        let builder: fn(&'static str, fn(TestRun<'static, _, _>) -> _) = $fs_builder;
                        builder("mfio-testsuite", fs_tests::$name);
                    }
                }
            }

            $(
                $(#[cfg($meta)])*
                impl_test!($test);
            )*
        }
    };
}

/// Builds filesystem test suite.
///
/// This includes all default tests, if you wish to not do that, please use
/// [`test_suite_base!`](crate::test_suite_base!) macro.
///
/// The first parameter of the macro is the name of the generated module, while the second one
/// contains a closure containing the test name and an asynchronous closure to be executed.
///
/// The closure that runs contains the entire test_suite modules. It accepts a `&'static mut T`,
/// where `T: Fs`. To get a static ref, use the `staticify` function. It is unsound, but necessary
/// to make test suite generation code ergonomic.
///
///
/// # Examples
///
/// ```no_run
/// use mfio_rt::*;
///
/// test_suite!(tests_default, |test_name, closure| {
///     let _ = ::env_logger::builder().is_test(true).try_init();
///     let mut rt = NativeRt::default();
///     let rt = staticify(&mut rt);
///     let dir = TempDir::new(test_name).unwrap();
///     rt.set_cwd(dir.path().to_path_buf());
///     rt.run(move |rt| {
///         let run = TestRun::new(rt, dir);
///         closure(run)
///     });
/// });
/// ```
#[macro_export]
macro_rules! test_suite {
    ($test_ident:ident, $fs_builder:expr) => {
        $crate::test_suite_base!(
            $test_ident,
            $fs_builder,
            #[cfg(not(miri))]
            all_tests_seq,
            #[cfg(not(miri))]
            all_tests_con,
            files_equal,
            files_equal_rel,
            dirs_equal,
            walk_dirs,
            writes_equal,
            writes_equal_rel
        );
    };
}

/// Builds network test suite.
///
/// The first parameter of the macro is the name of the generated module, while the second one
/// contains a closure containing the test name and an asynchronous closure to be executed.
///
/// The closure that runs contains the entire test_suite and net modules. It accepts a `&'static
/// mut T` where `T: Tcp`. To get a static ref, use the `staticify` function. It is unsound, but
/// necessary to make test suite generation code ergonomic.
///
/// # Examples
///
/// ```no_run
/// use mfio_rt::*;
///
/// net_test_suite!(net_tests_default, |closure| {
///     let _ = ::env_logger::builder().is_test(true).try_init();
///     let mut rt = NativeRt::default();
///     let rt = staticify(&mut rt);
///     rt.run(closure);
/// });
/// ```
#[cfg(feature = "std")]
#[macro_export]
macro_rules! net_test_suite {
    ($test_ident:ident, $fs_builder:expr) => {
        #[cfg(test)]
        #[allow(clippy::redundant_closure_call)]
        mod $test_ident {
            use net::*;
            use $crate::test_suite::*;

            async fn seq(i: impl Iterator<Item = impl Future<Output = ()> + '_> + '_) {
                for i in i {
                    i.await;
                }
            }

            async fn con(i: impl Iterator<Item = impl Future<Output = ()> + '_> + '_) {
                let unordered = i.collect::<futures::stream::FuturesUnordered<_>>();
                unordered.count().await;
            }

            fn staticify<T>(val: &mut T) -> &'static mut T {
                unsafe { core::mem::transmute(val) }
            }

            #[cfg(not(miri))]
            #[test]
            fn tcp_connect() {
                $fs_builder(|rt| async move {
                    let run = NetTestRun::new(rt);
                    run.tcp_connect().await;
                });
            }

            #[cfg(not(miri))]
            #[test]
            fn tcp_listen() {
                $fs_builder(|rt| async move {
                    let run = NetTestRun::new(rt);
                    run.tcp_listen().await;
                });
            }

            #[cfg(not(miri))]
            #[test]
            fn tcp_send_seq() {
                $fs_builder(|rt| async move {
                    let run = NetTestRun::new(rt);
                    seq(run.tcp_send()).await;
                });
            }

            #[cfg(not(miri))]
            #[test]
            fn tcp_send_con() {
                $fs_builder(|rt| async move {
                    let run = NetTestRun::new(rt);
                    con(run.tcp_send()).await;
                });
            }

            #[cfg(not(miri))]
            #[test]
            fn tcp_receive_seq() {
                $fs_builder(|rt| async move {
                    let run = NetTestRun::new(rt);
                    seq(run.tcp_receive()).await;
                });
            }

            #[cfg(not(miri))]
            #[test]
            fn tcp_receive_con() {
                $fs_builder(|rt| async move {
                    let run = NetTestRun::new(rt);
                    con(run.tcp_receive()).await;
                });
            }

            #[cfg(not(miri))]
            #[test]
            fn tcp_echo_client_seq() {
                $fs_builder(|rt| async move {
                    let run = NetTestRun::new(rt);
                    seq(run.tcp_echo_client()).await;
                });
            }

            #[cfg(not(miri))]
            #[test]
            fn tcp_echo_client_con() {
                $fs_builder(|rt| async move {
                    let run = NetTestRun::new(rt);
                    con(run.tcp_echo_client()).await;
                });
            }

            #[cfg(not(miri))]
            #[test]
            fn tcp_echo_server_seq() {
                $fs_builder(|rt| async move {
                    let run = NetTestRun::new(rt);
                    seq(run.tcp_echo_server()).await;
                });
            }

            #[cfg(not(miri))]
            #[test]
            fn tcp_echo_server_con() {
                $fs_builder(|rt| async move {
                    let run = NetTestRun::new(rt);
                    con(run.tcp_echo_server()).await;
                });
            }
        }
    };
}