BDD pattern is clarified

6 files changed, 485 insertions, 673 deletions

diff --git a/tests/common/constants.rs b/tests/common/constants.rs
new file mode 100644
index 0000000..c11a04d
--- /dev/null
+++ b/tests/common/constants.rs
@@ -0,0 +1,54 @@
+use std::time;
+
+pub static SMALL_DELAY: time::Duration = time::Duration::from_millis(200);
+
+pub static EMAIL1: &[u8] = b"Date: Sat, 8 Jul 2023 07:14:29 +0200\r
+From: Bob Robert <bob@example.tld>\r
+To: Alice Malice <alice@example.tld>\r
+CC: =?ISO-8859-1?Q?Andr=E9?= Pirard <PIRARD@vm1.ulg.ac.be>\r
+Subject: =?ISO-8859-1?B?SWYgeW91IGNhbiByZWFkIHRoaXMgeW8=?=\r
+    =?ISO-8859-2?B?dSB1bmRlcnN0YW5kIHRoZSBleGFtcGxlLg==?=\r
+X-Unknown: something something\r
+Bad entry\r
+  on multiple lines\r
+Message-ID: <NTAxNzA2AC47634Y366BAMTY4ODc5MzQyODY0ODY5@www.grrrndzero.org>\r
+MIME-Version: 1.0\r
+Content-Type: multipart/alternative;\r
+ boundary=\"b1_e376dc71bafc953c0b0fdeb9983a9956\"\r
+Content-Transfer-Encoding: 7bit\r
+\r
+This is a multi-part message in MIME format.\r
+\r
+--b1_e376dc71bafc953c0b0fdeb9983a9956\r
+Content-Type: text/plain; charset=utf-8\r
+Content-Transfer-Encoding: quoted-printable\r
+\r
+GZ\r
+OoOoO\r
+oOoOoOoOo\r
+oOoOoOoOoOoOoOoOo\r
+oOoOoOoOoOoOoOoOoOoOoOo\r
+oOoOoOoOoOoOoOoOoOoOoOoOoOoOo\r
+OoOoOoOoOoOoOoOoOoOoOoOoOoOoOoOoO\r
+\r
+--b1_e376dc71bafc953c0b0fdeb9983a9956\r
+Content-Type: text/html; charset=us-ascii\r
+\r
+<div style=\"text-align: center;\"><strong>GZ</strong><br />\r
+OoOoO<br />\r
+oOoOoOoOo<br />\r
+oOoOoOoOoOoOoOoOo<br />\r
+oOoOoOoOoOoOoOoOoOoOoOo<br />\r
+oOoOoOoOoOoOoOoOoOoOoOoOoOoOo<br />\r
+OoOoOoOoOoOoOoOoOoOoOoOoOoOoOoOoO<br />\r
+</div>\r
+\r
+--b1_e376dc71bafc953c0b0fdeb9983a9956--\r
+";
+
+pub static EMAIL2: &[u8] = b"From: alice@example.com\r
+To: alice@example.tld\r
+Subject: Test\r
+\r
+Hello world!\r
+";
diff --git a/tests/common/fragments.rs b/tests/common/fragments.rs
new file mode 100644
index 0000000..530f1f7
--- /dev/null
+++ b/tests/common/fragments.rs
@@ -0,0 +1,366 @@
+use anyhow::{bail, Result};
+use std::io::Write;
+use std::net::TcpStream;
+use std::thread;
+
+use crate::common::constants::*;
+use crate::common::*;
+
+/// These fragments are not a generic IMAP client
+/// but specialized to our specific tests. They can't take
+/// arbitrary values, only enum for which the code is known
+/// to be correct. The idea is that the generated message is more
+/// or less hardcoded by the developer, so its clear what's expected,
+/// and not generated by a library.
+
+pub fn connect(imap: &mut TcpStream) -> Result<()> {
+    let mut buffer: [u8; 1500] = [0; 1500];
+
+    let read = read_lines(imap, &mut buffer, None)?;
+    assert_eq!(&read[..4], &b"* OK"[..]);
+
+    Ok(())
+}
+
+pub enum Account {
+    Alice,
+}
+
+pub enum Extension {
+    None,
+    Unselect,
+    Move,
+    CondStore,
+}
+
+pub enum Mailbox {
+    Inbox,
+    Archive,
+    Drafts,
+}
+
+pub enum Flag {
+    Deleted,
+    Important
+}
+
+pub enum Email {
+    Basic,
+    Multipart,
+}
+
+pub enum Selection {
+    FirstId,
+    SecondId,
+}
+
+pub fn capability(imap: &mut TcpStream, ext: Extension) -> Result<()> {
+    imap.write(&b"5 capability\r\n"[..])?;
+
+    let maybe_ext = match ext {
+        Extension::None => None,
+        Extension::Unselect => Some("UNSELECT"),
+        Extension::Move => Some("MOVE"),
+        Extension::CondStore => Some("CONDSTORE"),
+    };
+
+    let mut buffer: [u8; 1500] = [0; 1500];
+    let read = read_lines(imap, &mut buffer, Some(&b"5 OK"[..]))?;
+    let srv_msg = std::str::from_utf8(read)?;
+    assert!(srv_msg.contains("IMAP4REV1"));
+    if let Some(ext) = maybe_ext {
+        assert!(srv_msg.contains(ext));
+    }
+
+    Ok(())
+}
+
+pub fn login(imap: &mut TcpStream, account: Account) -> Result<()> {
+    let mut buffer: [u8; 1500] = [0; 1500];
+
+    assert!(matches!(account, Account::Alice));
+    imap.write(&b"10 login alice hunter2\r\n"[..])?;
+
+    let read = read_lines(imap, &mut buffer, None)?;
+    assert_eq!(&read[..5], &b"10 OK"[..]);
+
+    Ok(())
+}
+
+pub fn create_mailbox(imap: &mut TcpStream, mbx: Mailbox) -> Result<()> {
+    let mut buffer: [u8; 1500] = [0; 1500];
+
+    let mbx_str = match mbx {
+        Mailbox::Inbox => "INBOX",
+        Mailbox::Archive => "Archive",
+        Mailbox::Drafts => "Drafts",
+    };
+
+    let cmd = format!("15 create {}\r\n", mbx_str);
+    imap.write(cmd.as_bytes())?;
+    let read = read_lines(imap, &mut buffer, None)?;
+    assert_eq!(&read[..12], &b"15 OK CREATE"[..]);
+
+    Ok(())
+}
+
+pub fn select(imap: &mut TcpStream, mbx: Mailbox, maybe_exists: Option<u64>) -> Result<()> {
+    let mut buffer: [u8; 6000] = [0; 6000];
+
+    let mbx_str = match mbx {
+        Mailbox::Inbox => "INBOX",
+        Mailbox::Archive => "Archive",
+        Mailbox::Drafts => "Drafts",
+    };
+    imap.write(format!("20 select {}\r\n", mbx_str).as_bytes())?;
+
+    let read = read_lines(imap, &mut buffer, Some(&b"20 OK"[..]))?;
+    let srv_msg = std::str::from_utf8(read)?;
+    if let Some(exists) = maybe_exists {
+        let expected = format!("* {} EXISTS", exists);
+        assert!(srv_msg.contains(&expected));
+    }
+
+    Ok(())
+}
+
+pub fn unselect(imap: &mut TcpStream) -> Result<()> {
+    imap.write(&b"70 unselect\r\n"[..])?;
+    let mut buffer: [u8; 1500] = [0; 1500];
+    let _read = read_lines(imap, &mut buffer, Some(&b"70 OK"[..]))?;
+
+    Ok(())
+}
+
+pub fn check(imap: &mut TcpStream) -> Result<()> {
+    let mut buffer: [u8; 1500] = [0; 1500];
+
+    imap.write(&b"21 check\r\n"[..])?;
+    let _read = read_lines(imap, &mut buffer, Some(&b"21 OK"[..]))?;
+
+    Ok(())
+}
+
+pub fn status_mailbox(imap: &mut TcpStream, mbx: Mailbox) -> Result<()> {
+    assert!(matches!(mbx, Mailbox::Archive));
+    imap.write(&b"25 STATUS Archive (UIDNEXT MESSAGES)\r\n"[..])?;
+    let mut buffer: [u8; 6000] = [0; 6000];
+    let _read = read_lines(imap, &mut buffer, Some(&b"25 OK"[..]))?;
+
+    Ok(())
+}
+
+pub fn lmtp_handshake(lmtp: &mut TcpStream) -> Result<()> {
+    let mut buffer: [u8; 1500] = [0; 1500];
+
+    let _read = read_lines(lmtp, &mut buffer, None)?;
+    assert_eq!(&buffer[..4], &b"220 "[..]);
+
+    lmtp.write(&b"LHLO example.tld\r\n"[..])?;
+    let _read = read_lines(lmtp, &mut buffer, Some(&b"250 "[..]))?;
+
+    Ok(())
+}
+
+pub fn lmtp_deliver_email(lmtp: &mut TcpStream, email_type: Email) -> Result<()> {
+    let mut buffer: [u8; 1500] = [0; 1500];
+
+    let email = match email_type {
+        Email::Basic => EMAIL2,
+        Email::Multipart => EMAIL1,
+    };
+    lmtp.write(&b"MAIL FROM:<bob@example.tld>\r\n"[..])?;
+    let _read = read_lines(lmtp, &mut buffer, Some(&b"250 2.0.0"[..]))?;
+
+    lmtp.write(&b"RCPT TO:<alice@example.tld>\r\n"[..])?;
+    let _read = read_lines(lmtp, &mut buffer, Some(&b"250 2.1.5"[..]))?;
+
+    lmtp.write(&b"DATA\r\n"[..])?;
+    let _read = read_lines(lmtp, &mut buffer, Some(&b"354 "[..]))?;
+
+    lmtp.write(email)?;
+    lmtp.write(&b"\r\n.\r\n"[..])?;
+    let _read = read_lines(lmtp, &mut buffer, Some(&b"250 2.0.0"[..]))?;
+
+    Ok(())
+}
+
+pub fn noop_exists(imap: &mut TcpStream) -> Result<()> {
+    let mut buffer: [u8; 6000] = [0; 6000];
+
+    let mut max_retry = 20;
+    loop {
+        max_retry -= 1;
+        imap.write(&b"30 NOOP\r\n"[..])?;
+        let read = read_lines(imap, &mut buffer, Some(&b"30 OK"[..]))?;
+        let srv_msg = std::str::from_utf8(read)?;
+
+        match (max_retry, srv_msg.lines().count()) {
+            (_, cnt) if cnt > 1 => break,
+            (0, _) => bail!("no more retry"),
+            _ => (),
+        }
+
+        thread::sleep(SMALL_DELAY);
+    }
+
+    Ok(())
+}
+
+pub fn fetch_rfc822(imap: &mut TcpStream, selection: Selection, r#ref: Email) -> Result<()> {
+    let mut buffer: [u8; 65535] = [0; 65535];
+
+    assert!(matches!(selection, Selection::FirstId));
+    imap.write(&b"40 fetch 1 rfc822\r\n"[..])?;
+
+    let read = read_lines(imap, &mut buffer, Some(&b"40 OK FETCH"[..]))?;
+    let srv_msg = std::str::from_utf8(read)?;
+
+    let ref_mail = match r#ref {
+        Email::Basic => EMAIL2,
+        Email::Multipart => EMAIL1,
+    };
+    let orig_email = std::str::from_utf8(ref_mail)?;
+    assert!(srv_msg.contains(orig_email));
+
+    Ok(())
+}
+
+pub fn copy(imap: &mut TcpStream, selection: Selection, to: Mailbox) -> Result<()> {
+    let mut buffer: [u8; 65535] = [0; 65535];
+    assert!(matches!(selection, Selection::FirstId));
+    assert!(matches!(to, Mailbox::Archive));
+
+    imap.write(&b"45 copy 1 Archive\r\n"[..])?;
+    let read = read_lines(imap, &mut buffer, None)?;
+    assert_eq!(&read[..5], &b"45 OK"[..]);
+
+    Ok(())
+}
+
+pub fn append_email(imap: &mut TcpStream, content: Email) -> Result<()> {
+    let mut buffer: [u8; 6000] = [0; 6000];
+
+    let ref_mail = match content {
+        Email::Multipart => EMAIL1,
+        Email::Basic => EMAIL2,
+    };
+
+    let append_cmd = format!("47 append inbox (\\Seen) {{{}}}\r\n", ref_mail.len());
+    println!("append cmd: {}", append_cmd);
+    imap.write(append_cmd.as_bytes())?;
+
+    // wait for continuation
+    let read = read_lines(imap, &mut buffer, None)?;
+    assert_eq!(read[0], b'+');
+
+    // write our stuff
+    imap.write(ref_mail)?;
+    imap.write(&b"\r\n"[..])?;
+    let read = read_lines(imap, &mut buffer, None)?;
+    assert_eq!(&read[..5], &b"47 OK"[..]);
+
+    // we check that noop detects the change
+    noop_exists(imap)?;
+
+    Ok(())
+}
+
+
+
+pub fn add_flags_email(imap: &mut TcpStream, selection: Selection, flag: Flag) -> Result<()> {
+    let mut buffer: [u8; 1500] = [0; 1500];
+    assert!(matches!(selection, Selection::FirstId));
+    assert!(matches!(flag, Flag::Deleted));
+    imap.write(&b"50 store 1 +FLAGS (\\Deleted)\r\n"[..])?;
+    let _read = read_lines(imap, &mut buffer, Some(&b"50 OK STORE"[..]))?;
+
+    Ok(())
+}
+
+#[allow(dead_code)]
+/// Not yet implemented
+pub fn search(imap: &mut TcpStream) -> Result<()> {
+    imap.write(&b"55 search text \"OoOoO\"\r\n"[..])?;
+    let mut buffer: [u8; 1500] = [0; 1500];
+    let _read = read_lines(imap, &mut buffer, Some(&b"55 OK SEARCH"[..]))?;
+    Ok(())
+}
+
+pub fn expunge(imap: &mut TcpStream) -> Result<()> {
+    imap.write(&b"60 expunge\r\n"[..])?;
+    let mut buffer: [u8; 1500] = [0; 1500];
+    let _read = read_lines(imap, &mut buffer, Some(&b"60 OK EXPUNGE"[..]))?;
+
+    Ok(())
+}
+
+pub fn rename_mailbox(imap: &mut TcpStream, from: Mailbox, to: Mailbox) -> Result<()> {
+    assert!(matches!(from, Mailbox::Archive));
+    assert!(matches!(to, Mailbox::Drafts));
+
+    imap.write(&b"70 rename Archive Drafts\r\n"[..])?;
+    let mut buffer: [u8; 1500] = [0; 1500];
+    let read = read_lines(imap, &mut buffer, None)?;
+    assert_eq!(&read[..5], &b"70 OK"[..]);
+
+    imap.write(&b"71 list \"\" *\r\n"[..])?;
+    let read = read_lines(imap, &mut buffer, Some(&b"71 OK LIST"[..]))?;
+    let srv_msg = std::str::from_utf8(read)?;
+    assert!(!srv_msg.contains(" Archive\r\n"));
+    assert!(srv_msg.contains(" INBOX\r\n"));
+    assert!(srv_msg.contains(" Drafts\r\n"));
+
+    Ok(())
+}
+
+pub fn delete_mailbox(imap: &mut TcpStream, mbx: Mailbox) -> Result<()> {
+    let mbx_str = match mbx {
+        Mailbox::Inbox => "INBOX",
+        Mailbox::Archive => "Archive",
+        Mailbox::Drafts => "Drafts",
+    };
+    let cmd = format!("80 delete {}\r\n", mbx_str);
+
+    imap.write(cmd.as_bytes())?;
+    let mut buffer: [u8; 1500] = [0; 1500];
+    let read = read_lines(imap, &mut buffer, None)?;
+    assert_eq!(&read[..5], &b"80 OK"[..]);
+
+    imap.write(&b"81 list \"\" *\r\n"[..])?;
+    let read = read_lines(imap, &mut buffer, Some(&b"81 OK"[..]))?;
+    let srv_msg = std::str::from_utf8(read)?;
+    assert!(srv_msg.contains(" INBOX\r\n"));
+    assert!(!srv_msg.contains(format!(" {}\r\n", mbx_str).as_str()));
+
+    Ok(())
+}
+
+pub fn close(imap: &mut TcpStream) -> Result<()> {
+    imap.write(&b"60 close\r\n"[..])?;
+    let mut buffer: [u8; 1500] = [0; 1500];
+    let _read = read_lines(imap, &mut buffer, Some(&b"60 OK"[..]))?;
+
+    Ok(())
+}
+
+pub fn r#move(imap: &mut TcpStream, selection: Selection, to: Mailbox) -> Result<()> {
+    let mut buffer: [u8; 1500] = [0; 1500];
+    assert!(matches!(to, Mailbox::Archive));
+    assert!(matches!(selection, Selection::FirstId));
+
+    imap.write(&b"35 move 1 Archive\r\n"[..])?;
+    let read = read_lines(imap, &mut buffer, Some(&b"35 OK"[..]))?;
+    let srv_msg = std::str::from_utf8(read)?;
+    assert!(srv_msg.contains("* 1 EXPUNGE"));
+
+    Ok(())
+}
+
+pub fn logout(imap: &mut TcpStream) -> Result<()> {
+    imap.write(&b"99 logout\r\n"[..])?;
+    let mut buffer: [u8; 1500] = [0; 1500];
+    let read = read_lines(imap, &mut buffer, None)?;
+    assert_eq!(&read[..5], &b"* BYE"[..]);
+    Ok(())
+}
diff --git a/tests/common.rs b/tests/common/mod.rs
index f89f26c..d0f4ed8 100644
--- a/tests/common.rs
+++ b/tests/common/mod.rs
@@ -1,33 +1,55 @@
+#![allow(dead_code)]
+pub mod constants;
+pub mod fragments;
+
 use anyhow::{bail, Context, Result};
 use std::io::Read;
 use std::net::{Shutdown, TcpStream};
 use std::process::Command;
-use std::{thread, time};
+use std::thread;
 
-static SMALL_DELAY: time::Duration = time::Duration::from_millis(200);
+use constants::SMALL_DELAY;
 
 pub fn aerogramme_provider_daemon_dev(
     mut fx: impl FnMut(&mut TcpStream, &mut TcpStream) -> Result<()>,
 ) -> Result<()> {
+    // Check port is not used (= free) before starting the test
+    let mut max_retry = 20;
+    loop {
+        max_retry -= 1;
+        match (TcpStream::connect("[::1]:1143"), max_retry) {
+            (Ok(_), 0) => bail!("something is listening on [::1]:1143 and prevent the test from starting"),
+            (Ok(_), _) => println!("something is listening on [::1]:1143, maybe a previous daemon quitting, retrying soon..."),
+            (Err(_), _) => {
+                println!("test ready to start, [::1]:1143 is free!");
+                break
+            }
+        }
+        thread::sleep(SMALL_DELAY);
+    }
+
+    // Start daemon
     let mut daemon = Command::new(env!("CARGO_BIN_EXE_aerogramme"))
         .arg("--dev")
         .arg("provider")
         .arg("daemon")
         .spawn()?;
 
+    // Check that our daemon is correctly listening on the free port
     let mut max_retry = 20;
     let mut imap_socket = loop {
         max_retry -= 1;
         match (TcpStream::connect("[::1]:1143"), max_retry) {
             (Err(e), 0) => bail!("no more retry, last error is: {}", e),
             (Err(e), _) => {
-                println!("unable to connect: {} ; will retry in 1 sec", e);
+                println!("unable to connect: {} ; will retry soon...", e);
             }
             (Ok(v), _) => break v,
         }
         thread::sleep(SMALL_DELAY);
     };
 
+    // Assuming now it's safe to open a LMTP socket
     let mut lmtp_socket =
         TcpStream::connect("[::1]:1025").context("lmtp socket must be connected")?;
 
diff --git a/tests/rfc3501_imap4rev1_base.rs b/tests/rfc3501_imap4rev1_base.rs
index c0985dd..690913a 100644
--- a/tests/rfc3501_imap4rev1_base.rs
+++ b/tests/rfc3501_imap4rev1_base.rs
@@ -1,341 +1,33 @@
-use anyhow::{bail, Context, Result};
-use std::io::Write;
-use std::net::TcpStream;
-use std::{thread, time};
+use anyhow::Context;
 
 mod common;
-use crate::common::read_lines;
-
-static SMALL_DELAY: time::Duration = time::Duration::from_millis(200);
+use crate::common::fragments::*;
 
 fn main() {
     common::aerogramme_provider_daemon_dev(|imap_socket, lmtp_socket| {
         connect(imap_socket).context("server says hello")?;
-        capability(imap_socket).context("check server capabilities")?;
-        login(imap_socket).context("login test")?;
-        create_mailbox(imap_socket).context("created mailbox archive")?;
+        capability(imap_socket, Extension::None).context("check server capabilities")?;
+        login(imap_socket, Account::Alice).context("login test")?;
+        create_mailbox(imap_socket, Mailbox::Archive).context("created mailbox archive")?;
         // UNSUBSCRIBE IS NOT IMPLEMENTED YET
         //unsubscribe_mailbox(imap_socket).context("unsubscribe from archive")?;
-        select_inbox(imap_socket).context("select inbox")?;
+        select(imap_socket, Mailbox::Inbox, None).context("select inbox")?;
         check(imap_socket).context("check must run")?;
-        status_mailbox(imap_socket).context("status of archive from inbox")?;
+        status_mailbox(imap_socket, Mailbox::Archive).context("status of archive from inbox")?;
         lmtp_handshake(lmtp_socket).context("handshake lmtp done")?;
-        lmtp_deliver_email(lmtp_socket, EMAIL1).context("mail delivered successfully")?;
+        lmtp_deliver_email(lmtp_socket, Email::Multipart).context("mail delivered successfully")?;
         noop_exists(imap_socket).context("noop loop must detect a new email")?;
-        fetch_rfc822(imap_socket, EMAIL1).context("fetch rfc822 message")?;
-        copy_email(imap_socket).context("copy message to the archive mailbox")?;
-        append_email(imap_socket, EMAIL2).context("insert email in INBOX")?;
+        fetch_rfc822(imap_socket, Selection::FirstId, Email::Multipart).context("fetch rfc822 message, should be our first message")?;
+        copy(imap_socket, Selection::FirstId, Mailbox::Archive).context("copy message to the archive mailbox")?;
+        append_email(imap_socket, Email::Basic).context("insert email in INBOX")?;
         // SEARCH IS NOT IMPLEMENTED YET
         //search(imap_socket).expect("search should return something");
-        add_flags_email(imap_socket)
-            .context("should add delete and important flags to the email")?;
+        add_flags_email(imap_socket, Selection::FirstId, Flag::Deleted)
+            .context("should add delete flag to the email")?;
         expunge(imap_socket).context("expunge emails")?;
-        rename_mailbox(imap_socket).context("archive mailbox is renamed my-archives")?;
-        delete_mailbox(imap_socket).context("my-archives mailbox is deleted")?;
+        rename_mailbox(imap_socket, Mailbox::Archive, Mailbox::Drafts).context("Archive mailbox is renamed Drafts")?;
+        delete_mailbox(imap_socket, Mailbox::Drafts).context("Drafts mailbox is deleted")?;
         Ok(())
     })
     .expect("test fully run");
 }
-
-fn connect(imap: &mut TcpStream) -> Result<()> {
-    let mut buffer: [u8; 1500] = [0; 1500];
-
-    let read = read_lines(imap, &mut buffer, None)?;
-    assert_eq!(&read[..4], &b"* OK"[..]);
-
-    Ok(())
-}
-
-fn capability(imap: &mut TcpStream) -> Result<()> {
-    imap.write(&b"5 capability\r\n"[..])?;
-
-    let mut buffer: [u8; 1500] = [0; 1500];
-    let read = read_lines(imap, &mut buffer, Some(&b"5 OK"[..]))?;
-    let srv_msg = std::str::from_utf8(read)?;
-    assert!(srv_msg.contains("IMAP4REV1"));
-
-    Ok(())
-}
-
-fn login(imap: &mut TcpStream) -> Result<()> {
-    let mut buffer: [u8; 1500] = [0; 1500];
-
-    imap.write(&b"10 login alice hunter2\r\n"[..])?;
-
-    let read = read_lines(imap, &mut buffer, None)?;
-    assert_eq!(&read[..5], &b"10 OK"[..]);
-
-    Ok(())
-}
-
-fn create_mailbox(imap: &mut TcpStream) -> Result<()> {
-    let mut buffer: [u8; 1500] = [0; 1500];
-
-    imap.write(&b"15 create archive\r\n"[..])?;
-    let read = read_lines(imap, &mut buffer, None)?;
-    assert_eq!(&read[..12], &b"15 OK CREATE"[..]);
-
-    Ok(())
-}
-
-#[allow(dead_code)]
-fn unsubscribe_mailbox(imap: &mut TcpStream) -> Result<()> {
-    let mut buffer: [u8; 6000] = [0; 6000];
-
-    imap.write(&b"16 lsub \"\" *\r\n"[..])?;
-    let read = read_lines(imap, &mut buffer, Some(&b"16 OK LSUB"[..]))?;
-    let srv_msg = std::str::from_utf8(read)?;
-    assert!(srv_msg.contains(" INBOX\r\n"));
-    assert!(srv_msg.contains(" archive\r\n"));
-
-    imap.write(&b"17 unsubscribe archive\r\n"[..])?;
-    let read = read_lines(imap, &mut buffer, None)?;
-    assert_eq!(&read[..5], &b"17 OK"[..]);
-
-    imap.write(&b"18 lsub \"\" *\r\n"[..])?;
-    let read = read_lines(imap, &mut buffer, Some(&b"18 OK LSUB"[..]))?;
-    let srv_msg = std::str::from_utf8(read)?;
-    assert!(srv_msg.contains(" INBOX\r\n"));
-    assert!(!srv_msg.contains(" archive\r\n"));
-
-    Ok(())
-}
-
-fn select_inbox(imap: &mut TcpStream) -> Result<()> {
-    let mut buffer: [u8; 6000] = [0; 6000];
-
-    imap.write(&b"20 select inbox\r\n"[..])?;
-    let _read = read_lines(imap, &mut buffer, Some(&b"20 OK"[..]))?;
-
-    Ok(())
-}
-
-fn check(imap: &mut TcpStream) -> Result<()> {
-    let mut buffer: [u8; 1500] = [0; 1500];
-
-    imap.write(&b"21 check\r\n"[..])?;
-    let _read = read_lines(imap, &mut buffer, Some(&b"21 OK"[..]))?;
-
-    Ok(())
-}
-
-fn status_mailbox(imap: &mut TcpStream) -> Result<()> {
-    imap.write(&b"25 STATUS archive (UIDNEXT MESSAGES)\r\n"[..])?;
-    let mut buffer: [u8; 6000] = [0; 6000];
-    let _read = read_lines(imap, &mut buffer, Some(&b"25 OK"[..]))?;
-
-    Ok(())
-}
-
-fn lmtp_handshake(lmtp: &mut TcpStream) -> Result<()> {
-    let mut buffer: [u8; 1500] = [0; 1500];
-
-    let _read = read_lines(lmtp, &mut buffer, None)?;
-    assert_eq!(&buffer[..4], &b"220 "[..]);
-
-    lmtp.write(&b"LHLO example.tld\r\n"[..])?;
-    let _read = read_lines(lmtp, &mut buffer, Some(&b"250 "[..]))?;
-
-    Ok(())
-}
-
-fn lmtp_deliver_email(lmtp: &mut TcpStream, email: &[u8]) -> Result<()> {
-    let mut buffer: [u8; 1500] = [0; 1500];
-
-    lmtp.write(&b"MAIL FROM:<bob@example.tld>\r\n"[..])?;
-    let _read = read_lines(lmtp, &mut buffer, Some(&b"250 2.0.0"[..]))?;
-
-    lmtp.write(&b"RCPT TO:<alice@example.tld>\r\n"[..])?;
-    let _read = read_lines(lmtp, &mut buffer, Some(&b"250 2.1.5"[..]))?;
-
-    lmtp.write(&b"DATA\r\n"[..])?;
-    let _read = read_lines(lmtp, &mut buffer, Some(&b"354 "[..]))?;
-
-    lmtp.write(email)?;
-    lmtp.write(&b"\r\n.\r\n"[..])?;
-    let _read = read_lines(lmtp, &mut buffer, Some(&b"250 2.0.0"[..]))?;
-
-    Ok(())
-}
-
-fn noop_exists(imap: &mut TcpStream) -> Result<()> {
-    let mut buffer: [u8; 6000] = [0; 6000];
-
-    let mut max_retry = 20;
-    loop {
-        max_retry -= 1;
-        imap.write(&b"30 NOOP\r\n"[..])?;
-        let read = read_lines(imap, &mut buffer, Some(&b"30 OK NOOP"[..]))?;
-        let srv_msg = std::str::from_utf8(read)?;
-
-        match (max_retry, srv_msg.contains("* 1 EXISTS")) {
-            (_, true) => break,
-            (0, _) => bail!("no more retry"),
-            _ => (),
-        }
-
-        thread::sleep(SMALL_DELAY);
-    }
-
-    Ok(())
-}
-
-fn fetch_rfc822(imap: &mut TcpStream, ref_mail: &[u8]) -> Result<()> {
-    let mut buffer: [u8; 65535] = [0; 65535];
-    imap.write(&b"40 fetch 1 rfc822\r\n"[..])?;
-
-    let read = read_lines(imap, &mut buffer, Some(&b"40 OK FETCH"[..]))?;
-    let srv_msg = std::str::from_utf8(read)?;
-    let orig_email = std::str::from_utf8(ref_mail)?;
-    assert!(srv_msg.contains(orig_email));
-
-    Ok(())
-}
-
-fn copy_email(imap: &mut TcpStream) -> Result<()> {
-    let mut buffer: [u8; 65535] = [0; 65535];
-    imap.write(&b"45 copy 1 archive\r\n"[..])?;
-    let read = read_lines(imap, &mut buffer, None)?;
-    assert_eq!(&read[..5], &b"45 OK"[..]);
-
-    Ok(())
-}
-
-fn append_email(imap: &mut TcpStream, ref_mail: &[u8]) -> Result<()> {
-    let mut buffer: [u8; 6000] = [0; 6000];
-    assert_ne!(ref_mail.len(), 0);
-    let append_cmd = format!("47 append inbox (\\Seen) {{{}}}\r\n", ref_mail.len());
-    println!("append cmd: {}", append_cmd);
-    imap.write(append_cmd.as_bytes())?;
-
-    // wait for continuation
-    let read = read_lines(imap, &mut buffer, None)?;
-    assert_eq!(read[0], b'+');
-
-    // write our stuff
-    imap.write(ref_mail)?;
-    imap.write(&b"\r\n"[..])?;
-    let read = read_lines(imap, &mut buffer, None)?;
-    assert_eq!(&read[..5], &b"47 OK"[..]);
-
-    // noop to force a sync
-    imap.write(&b"48 NOOP\r\n"[..])?;
-    let _read = read_lines(imap, &mut buffer, Some(&b"48 OK NOOP"[..]))?;
-
-    // check it is stored successfully
-    imap.write(&b"49 fetch 2 rfc822.size\r\n"[..])?;
-    let read = read_lines(imap, &mut buffer, Some(&b"49 OK"[..]))?;
-    let expected = format!("* 2 FETCH (RFC822.SIZE {})", ref_mail.len());
-    let expbytes = expected.as_bytes();
-    assert_eq!(&read[..expbytes.len()], expbytes);
-
-    Ok(())
-}
-
-fn add_flags_email(imap: &mut TcpStream) -> Result<()> {
-    let mut buffer: [u8; 1500] = [0; 1500];
-    imap.write(&b"50 store 1 +FLAGS (\\Deleted \\Important)\r\n"[..])?;
-    let _read = read_lines(imap, &mut buffer, Some(&b"50 OK STORE"[..]))?;
-
-    Ok(())
-}
-
-#[allow(dead_code)]
-/// Not yet implemented
-fn search(imap: &mut TcpStream) -> Result<()> {
-    imap.write(&b"55 search text \"OoOoO\"\r\n"[..])?;
-    let mut buffer: [u8; 1500] = [0; 1500];
-    let _read = read_lines(imap, &mut buffer, Some(&b"55 OK SEARCH"[..]))?;
-    Ok(())
-}
-
-fn expunge(imap: &mut TcpStream) -> Result<()> {
-    imap.write(&b"60 expunge\r\n"[..])?;
-    let mut buffer: [u8; 1500] = [0; 1500];
-    let _read = read_lines(imap, &mut buffer, Some(&b"60 OK EXPUNGE"[..]))?;
-
-    Ok(())
-}
-
-fn rename_mailbox(imap: &mut TcpStream) -> Result<()> {
-    imap.write(&b"70 rename archive my-archives\r\n"[..])?;
-    let mut buffer: [u8; 1500] = [0; 1500];
-    let read = read_lines(imap, &mut buffer, None)?;
-    assert_eq!(&read[..5], &b"70 OK"[..]);
-
-    imap.write(&b"71 list \"\" *\r\n"[..])?;
-    let read = read_lines(imap, &mut buffer, Some(&b"71 OK LIST"[..]))?;
-    let srv_msg = std::str::from_utf8(read)?;
-    assert!(!srv_msg.contains(" archive\r\n"));
-    assert!(srv_msg.contains(" INBOX\r\n"));
-    assert!(srv_msg.contains(" my-archives\r\n"));
-
-    Ok(())
-}
-
-fn delete_mailbox(imap: &mut TcpStream) -> Result<()> {
-    imap.write(&b"80 delete my-archives\r\n"[..])?;
-    let mut buffer: [u8; 1500] = [0; 1500];
-    let read = read_lines(imap, &mut buffer, None)?;
-    assert_eq!(&read[..5], &b"80 OK"[..]);
-
-    imap.write(&b"81 list \"\" *\r\n"[..])?;
-    let read = read_lines(imap, &mut buffer, Some(&b"81 OK LIST"[..]))?;
-    let srv_msg = std::str::from_utf8(read)?;
-    assert!(!srv_msg.contains(" archive\r\n"));
-    assert!(!srv_msg.contains(" my-archives\r\n"));
-    assert!(srv_msg.contains(" INBOX\r\n"));
-
-    Ok(())
-}
-
-static EMAIL1: &[u8] = b"Date: Sat, 8 Jul 2023 07:14:29 +0200\r
-From: Bob Robert <bob@example.tld>\r
-To: Alice Malice <alice@example.tld>\r
-CC: =?ISO-8859-1?Q?Andr=E9?= Pirard <PIRARD@vm1.ulg.ac.be>\r
-Subject: =?ISO-8859-1?B?SWYgeW91IGNhbiByZWFkIHRoaXMgeW8=?=\r
-    =?ISO-8859-2?B?dSB1bmRlcnN0YW5kIHRoZSBleGFtcGxlLg==?=\r
-X-Unknown: something something\r
-Bad entry\r
-  on multiple lines\r
-Message-ID: <NTAxNzA2AC47634Y366BAMTY4ODc5MzQyODY0ODY5@www.grrrndzero.org>\r
-MIME-Version: 1.0\r
-Content-Type: multipart/alternative;\r
- boundary=\"b1_e376dc71bafc953c0b0fdeb9983a9956\"\r
-Content-Transfer-Encoding: 7bit\r
-\r
-This is a multi-part message in MIME format.\r
-\r
---b1_e376dc71bafc953c0b0fdeb9983a9956\r
-Content-Type: text/plain; charset=utf-8\r
-Content-Transfer-Encoding: quoted-printable\r
-\r
-GZ\r
-OoOoO\r
-oOoOoOoOo\r
-oOoOoOoOoOoOoOoOo\r
-oOoOoOoOoOoOoOoOoOoOoOo\r
-oOoOoOoOoOoOoOoOoOoOoOoOoOoOo\r
-OoOoOoOoOoOoOoOoOoOoOoOoOoOoOoOoO\r
-\r
---b1_e376dc71bafc953c0b0fdeb9983a9956\r
-Content-Type: text/html; charset=us-ascii\r
-\r
-<div style=\"text-align: center;\"><strong>GZ</strong><br />\r
-OoOoO<br />\r
-oOoOoOoOo<br />\r
-oOoOoOoOoOoOoOoOo<br />\r
-oOoOoOoOoOoOoOoOoOoOoOo<br />\r
-oOoOoOoOoOoOoOoOoOoOoOoOoOoOo<br />\r
-OoOoOoOoOoOoOoOoOoOoOoOoOoOoOoOoO<br />\r
-</div>\r
-\r
---b1_e376dc71bafc953c0b0fdeb9983a9956--\r
-";
-
-static EMAIL2: &[u8] = b"From: alice@example.com\r
-To: alice@example.tld\r
-Subject: Test\r
-\r
-Hello world!\r
-";
diff --git a/tests/rfc3691_imapext_unselect.rs b/tests/rfc3691_imapext_unselect.rs
index 28e4bc8..4c5a45d 100644
--- a/tests/rfc3691_imapext_unselect.rs
+++ b/tests/rfc3691_imapext_unselect.rs
@@ -1,190 +1,28 @@
-use anyhow::{bail, Context, Result};
-use std::io::Write;
-use std::net::TcpStream;
-use std::{thread, time};
+use anyhow::Context;
 
 mod common;
-use crate::common::read_lines;
-
-static SMALL_DELAY: time::Duration = time::Duration::from_millis(200);
-static EMAIL: &[u8] = b"From: alice@example.com\r
-To: alice@example.tld\r
-Subject: Test\r
-\r
-Hello world!\r
-";
+use crate::common::fragments::*;
 
 fn main() {
     common::aerogramme_provider_daemon_dev(|imap_socket, lmtp_socket| {
+        connect(imap_socket).context("server says hello")?;
+
         lmtp_handshake(lmtp_socket).context("handshake lmtp done")?;
-        lmtp_deliver_email(lmtp_socket, EMAIL).context("mail delivered successfully")?;
+        lmtp_deliver_email(lmtp_socket, Email::Basic).context("mail delivered successfully")?;
 
-        connect(imap_socket).context("server says hello")?;
-        capability(imap_socket).context("check server capabilities")?;
-        login(imap_socket).context("login test")?;
-        select_inbox(imap_socket).context("select inbox")?;
+        capability(imap_socket, Extension::Unselect).context("check server capabilities")?;
+        login(imap_socket, Account::Alice).context("login test")?;
+        select(imap_socket, Mailbox::Inbox, None).context("select inbox")?;
         noop_exists(imap_socket).context("noop loop must detect a new email")?;
-        add_flags_email(imap_socket).context("add delete flags to the email")?;
+        add_flags_email(imap_socket, Selection::FirstId, Flag::Deleted).context("add delete flags to the email")?;
         unselect(imap_socket)
             .context("unselect inbox while preserving email with the \\Delete flag")?;
-        select_inbox_one_msg(imap_socket).context("select inbox again")?;
-        fetch_rfc822(imap_socket, EMAIL).context("message is still present")?;
+        select(imap_socket, Mailbox::Inbox, Some(1)).context("select inbox again")?;
+        fetch_rfc822(imap_socket, Selection::FirstId, Email::Basic).context("message is still present")?;
         close(imap_socket).context("close inbox and expunge message")?;
-        select_inbox_zero_msg(imap_socket).context("select inbox again and check it's empty")?;
+        select(imap_socket, Mailbox::Inbox, Some(0)).context("select inbox again and check it's empty")?;
 
         Ok(())
     })
     .expect("test fully run");
 }
-
-fn connect(imap: &mut TcpStream) -> Result<()> {
-    let mut buffer: [u8; 1500] = [0; 1500];
-
-    let read = read_lines(imap, &mut buffer, None)?;
-    assert_eq!(&read[..4], &b"* OK"[..]);
-
-    Ok(())
-}
-
-fn capability(imap: &mut TcpStream) -> Result<()> {
-    imap.write(&b"5 capability\r\n"[..])?;
-
-    let mut buffer: [u8; 1500] = [0; 1500];
-    let read = read_lines(imap, &mut buffer, Some(&b"5 OK"[..]))?;
-    let srv_msg = std::str::from_utf8(read)?;
-    assert!(srv_msg.contains("IMAP4REV1"));
-    assert!(srv_msg.contains("UNSELECT"));
-
-    Ok(())
-}
-
-fn login(imap: &mut TcpStream) -> Result<()> {
-    let mut buffer: [u8; 1500] = [0; 1500];
-
-    imap.write(&b"10 login alice hunter2\r\n"[..])?;
-
-    let read = read_lines(imap, &mut buffer, None)?;
-    assert_eq!(&read[..5], &b"10 OK"[..]);
-
-    Ok(())
-}
-
-fn select_inbox_one_msg(imap: &mut TcpStream) -> Result<()> {
-    let mut buffer: [u8; 6000] = [0; 6000];
-
-    imap.write(&b"22 select inbox\r\n"[..])?;
-    let read = read_lines(imap, &mut buffer, Some(&b"22 OK"[..]))?;
-    let srv_msg = std::str::from_utf8(read)?;
-    assert!(srv_msg.contains("* 1 EXISTS"));
-
-    Ok(())
-}
-
-fn select_inbox_zero_msg(imap: &mut TcpStream) -> Result<()> {
-    let mut buffer: [u8; 6000] = [0; 6000];
-
-    imap.write(&b"21 select inbox\r\n"[..])?;
-    let read = read_lines(imap, &mut buffer, Some(&b"21 OK"[..]))?;
-    let srv_msg = std::str::from_utf8(read)?;
-    assert!(srv_msg.contains("* 0 EXISTS"));
-
-    Ok(())
-}
-
-fn select_inbox(imap: &mut TcpStream) -> Result<()> {
-    let mut buffer: [u8; 6000] = [0; 6000];
-
-    imap.write(&b"20 select inbox\r\n"[..])?;
-    let _read = read_lines(imap, &mut buffer, Some(&b"20 OK"[..]))?;
-
-    Ok(())
-}
-
-fn noop_exists(imap: &mut TcpStream) -> Result<()> {
-    let mut buffer: [u8; 6000] = [0; 6000];
-
-    let mut max_retry = 20;
-    loop {
-        max_retry -= 1;
-        imap.write(&b"30 NOOP\r\n"[..])?;
-        let read = read_lines(imap, &mut buffer, Some(&b"30 OK NOOP"[..]))?;
-        let srv_msg = std::str::from_utf8(read)?;
-
-        match (max_retry, srv_msg.contains("* 1 EXISTS")) {
-            (_, true) => break,
-            (0, _) => bail!("no more retry"),
-            _ => (),
-        }
-
-        thread::sleep(SMALL_DELAY);
-    }
-
-    Ok(())
-}
-
-fn lmtp_handshake(lmtp: &mut TcpStream) -> Result<()> {
-    let mut buffer: [u8; 1500] = [0; 1500];
-
-    let _read = read_lines(lmtp, &mut buffer, None)?;
-    assert_eq!(&buffer[..4], &b"220 "[..]);
-
-    lmtp.write(&b"LHLO example.tld\r\n"[..])?;
-    let _read = read_lines(lmtp, &mut buffer, Some(&b"250 "[..]))?;
-
-    Ok(())
-}
-
-fn lmtp_deliver_email(lmtp: &mut TcpStream, email: &[u8]) -> Result<()> {
-    let mut buffer: [u8; 1500] = [0; 1500];
-
-    lmtp.write(&b"MAIL FROM:<bob@example.tld>\r\n"[..])?;
-    let _read = read_lines(lmtp, &mut buffer, Some(&b"250 2.0.0"[..]))?;
-
-    lmtp.write(&b"RCPT TO:<alice@example.tld>\r\n"[..])?;
-    let _read = read_lines(lmtp, &mut buffer, Some(&b"250 2.1.5"[..]))?;
-
-    lmtp.write(&b"DATA\r\n"[..])?;
-    let _read = read_lines(lmtp, &mut buffer, Some(&b"354 "[..]))?;
-
-    lmtp.write(email)?;
-    lmtp.write(&b"\r\n.\r\n"[..])?;
-    let _read = read_lines(lmtp, &mut buffer, Some(&b"250 2.0.0"[..]))?;
-
-    Ok(())
-}
-
-fn fetch_rfc822(imap: &mut TcpStream, ref_mail: &[u8]) -> Result<()> {
-    let mut buffer: [u8; 65535] = [0; 65535];
-    imap.write(&b"40 fetch 1 rfc822\r\n"[..])?;
-
-    let read = read_lines(imap, &mut buffer, Some(&b"40 OK FETCH"[..]))?;
-    let srv_msg = std::str::from_utf8(read)?;
-    let orig_email = std::str::from_utf8(ref_mail)?;
-    assert!(srv_msg.contains(orig_email));
-
-    Ok(())
-}
-
-fn add_flags_email(imap: &mut TcpStream) -> Result<()> {
-    let mut buffer: [u8; 1500] = [0; 1500];
-    imap.write(&b"50 store 1 +FLAGS (\\Deleted)\r\n"[..])?;
-    let _read = read_lines(imap, &mut buffer, Some(&b"50 OK STORE"[..]))?;
-
-    Ok(())
-}
-
-fn close(imap: &mut TcpStream) -> Result<()> {
-    imap.write(&b"60 close\r\n"[..])?;
-    let mut buffer: [u8; 1500] = [0; 1500];
-    let _read = read_lines(imap, &mut buffer, Some(&b"60 OK"[..]))?;
-
-    Ok(())
-}
-
-fn unselect(imap: &mut TcpStream) -> Result<()> {
-    imap.write(&b"70 unselect\r\n"[..])?;
-    let mut buffer: [u8; 1500] = [0; 1500];
-    let _read = read_lines(imap, &mut buffer, Some(&b"70 OK"[..]))?;
-
-    Ok(())
-}
diff --git a/tests/rfc6851_imapext_move.rs b/tests/rfc6851_imapext_move.rs
index d379f8d..a535bce 100644
--- a/tests/rfc6851_imapext_move.rs
+++ b/tests/rfc6851_imapext_move.rs
@@ -1,190 +1,30 @@
-use anyhow::{bail, Context, Result};
-use std::io::Write;
-use std::net::TcpStream;
-use std::{thread, time};
+use anyhow::Context;
 
 mod common;
-use crate::common::read_lines;
-
-static SMALL_DELAY: time::Duration = time::Duration::from_millis(200);
-static EMAIL: &[u8] = b"From: alice@example.com\r
-To: alice@example.tld\r
-Subject: Test\r
-\r
-Hello world!\r
-";
-
-enum Mailbox {
-    Inbox,
-    Archive,
-}
+use common::fragments::*;
 
 fn main() {
     common::aerogramme_provider_daemon_dev(|imap_socket, lmtp_socket| {
+        connect(imap_socket).context("server says hello")?;
+
+        capability(imap_socket, Extension::Move).context("check server capabilities")?;
+        login(imap_socket, Account::Alice).context("login test")?;
+        create_mailbox(imap_socket, Mailbox::Archive).context("created mailbox archive")?;
+        select(imap_socket, Mailbox::Inbox, None).context("select inbox")?;
+
         lmtp_handshake(lmtp_socket).context("handshake lmtp done")?;
-        lmtp_deliver_email(lmtp_socket, EMAIL).context("mail delivered successfully")?;
+        lmtp_deliver_email(lmtp_socket, Email::Basic).context("mail delivered successfully")?;
 
-        connect(imap_socket).context("server says hello")?;
-        capability(imap_socket).context("check server capabilities")?;
-        login(imap_socket).context("login test")?;
-        create_mailbox(imap_socket).context("created mailbox archive")?;
-        select(imap_socket, Mailbox::Inbox).context("select inbox")?;
         noop_exists(imap_socket).context("noop loop must detect a new email")?;
-
-        r#move(imap_socket).context("message from inbox moved to archive")?;
+        r#move(imap_socket, Selection::FirstId, Mailbox::Archive).context("message from inbox moved to archive")?;
 
         unselect(imap_socket)
             .context("unselect inbox while preserving email with the \\Delete flag")?;
-        select(imap_socket, Mailbox::Archive).context("select archive")?;
-        fetch_rfc822(imap_socket, EMAIL).context("check mail exists")?;
+        select(imap_socket, Mailbox::Archive, Some(1)).context("select archive")?;
+        fetch_rfc822(imap_socket, Selection::FirstId, Email::Basic).context("check mail exists")?;
         logout(imap_socket).context("must quit")?;
 
         Ok(())
     })
     .expect("test fully run");
 }
-
-fn connect(imap: &mut TcpStream) -> Result<()> {
-    let mut buffer: [u8; 1500] = [0; 1500];
-
-    let read = read_lines(imap, &mut buffer, None)?;
-    assert_eq!(&read[..4], &b"* OK"[..]);
-
-    Ok(())
-}
-
-fn create_mailbox(imap: &mut TcpStream) -> Result<()> {
-    let mut buffer: [u8; 1500] = [0; 1500];
-
-    imap.write(&b"15 create archive\r\n"[..])?;
-    let read = read_lines(imap, &mut buffer, None)?;
-    assert_eq!(&read[..12], &b"15 OK CREATE"[..]);
-
-    Ok(())
-}
-
-fn capability(imap: &mut TcpStream) -> Result<()> {
-    imap.write(&b"5 capability\r\n"[..])?;
-
-    let mut buffer: [u8; 1500] = [0; 1500];
-    let read = read_lines(imap, &mut buffer, Some(&b"5 OK"[..]))?;
-    let srv_msg = std::str::from_utf8(read)?;
-    assert!(srv_msg.contains("IMAP4REV1"));
-    assert!(srv_msg.contains("UNSELECT"));
-
-    Ok(())
-}
-
-fn login(imap: &mut TcpStream) -> Result<()> {
-    let mut buffer: [u8; 1500] = [0; 1500];
-
-    imap.write(&b"10 login alice hunter2\r\n"[..])?;
-
-    let read = read_lines(imap, &mut buffer, None)?;
-    assert_eq!(&read[..5], &b"10 OK"[..]);
-
-    Ok(())
-}
-
-fn select(imap: &mut TcpStream, mbx: Mailbox) -> Result<()> {
-    let mut buffer: [u8; 6000] = [0; 6000];
-
-    match mbx {
-        Mailbox::Inbox => imap.write(&b"20 select inbox\r\n"[..])?,
-        Mailbox::Archive => imap.write(&b"20 select archive\r\n"[..])?,
-    };
-    let _read = read_lines(imap, &mut buffer, Some(&b"20 OK"[..]))?;
-
-    Ok(())
-}
-
-fn noop_exists(imap: &mut TcpStream) -> Result<()> {
-    let mut buffer: [u8; 6000] = [0; 6000];
-
-    let mut max_retry = 20;
-    loop {
-        max_retry -= 1;
-        imap.write(&b"30 NOOP\r\n"[..])?;
-        let read = read_lines(imap, &mut buffer, Some(&b"30 OK NOOP"[..]))?;
-        let srv_msg = std::str::from_utf8(read)?;
-
-        match (max_retry, srv_msg.contains("* 1 EXISTS")) {
-            (_, true) => break,
-            (0, _) => bail!("no more retry"),
-            _ => (),
-        }
-
-        thread::sleep(SMALL_DELAY);
-    }
-
-    Ok(())
-}
-
-fn r#move(imap: &mut TcpStream) -> Result<()> {
-    let mut buffer: [u8; 1500] = [0; 1500];
-    imap.write(&b"35 move 1 archive\r\n"[..])?;
-    let read = read_lines(imap, &mut buffer, Some(&b"35 OK"[..]))?;
-    let srv_msg = std::str::from_utf8(read)?;
-    assert!(srv_msg.contains("* 1 EXPUNGE"));
-
-    Ok(())
-}
-
-fn lmtp_handshake(lmtp: &mut TcpStream) -> Result<()> {
-    let mut buffer: [u8; 1500] = [0; 1500];
-
-    let _read = read_lines(lmtp, &mut buffer, None)?;
-    assert_eq!(&buffer[..4], &b"220 "[..]);
-
-    lmtp.write(&b"LHLO example.tld\r\n"[..])?;
-    let _read = read_lines(lmtp, &mut buffer, Some(&b"250 "[..]))?;
-
-    Ok(())
-}
-
-fn lmtp_deliver_email(lmtp: &mut TcpStream, email: &[u8]) -> Result<()> {
-    let mut buffer: [u8; 1500] = [0; 1500];
-
-    lmtp.write(&b"MAIL FROM:<bob@example.tld>\r\n"[..])?;
-    let _read = read_lines(lmtp, &mut buffer, Some(&b"250 2.0.0"[..]))?;
-
-    lmtp.write(&b"RCPT TO:<alice@example.tld>\r\n"[..])?;
-    let _read = read_lines(lmtp, &mut buffer, Some(&b"250 2.1.5"[..]))?;
-
-    lmtp.write(&b"DATA\r\n"[..])?;
-    let _read = read_lines(lmtp, &mut buffer, Some(&b"354 "[..]))?;
-
-    lmtp.write(email)?;
-    lmtp.write(&b"\r\n.\r\n"[..])?;
-    let _read = read_lines(lmtp, &mut buffer, Some(&b"250 2.0.0"[..]))?;
-
-    Ok(())
-}
-
-fn fetch_rfc822(imap: &mut TcpStream, ref_mail: &[u8]) -> Result<()> {
-    let mut buffer: [u8; 65535] = [0; 65535];
-    imap.write(&b"40 fetch 1 rfc822\r\n"[..])?;
-
-    let read = read_lines(imap, &mut buffer, Some(&b"40 OK FETCH"[..]))?;
-    let srv_msg = std::str::from_utf8(read)?;
-    let orig_email = std::str::from_utf8(ref_mail)?;
-    assert!(srv_msg.contains(orig_email));
-
-    Ok(())
-}
-
-fn logout(imap: &mut TcpStream) -> Result<()> {
-    imap.write(&b"99 logout\r\n"[..])?;
-    let mut buffer: [u8; 1500] = [0; 1500];
-    let read = read_lines(imap, &mut buffer, None)?;
-    assert_eq!(&read[..5], &b"* BYE"[..]);
-    Ok(())
-}
-
-fn unselect(imap: &mut TcpStream) -> Result<()> {
-    imap.write(&b"70 unselect\r\n"[..])?;
-    let mut buffer: [u8; 1500] = [0; 1500];
-    let _read = read_lines(imap, &mut buffer, Some(&b"70 OK"[..]))?;
-
-    Ok(())
-}