test: persistence e2e and registration-relogin e2e; lint clean

Adds a lib target (soulseek_rs_tui) exposing cli/models/persist so
integration tests can drive the persistence pipeline: state and config
survive a simulated restart through the real files, with the incomplete
download flagged for auto-resume. The lib e2e suite gains a
register-then-relogin test against soulfind proving the stored-credential
flow's server assumptions. cargo clippy --all-targets and cargo fmt are
clean.

soulseek-rs-lib/tests/e2e.rs

@@ -417,6 +417,30 @@ fn wrong_password_is_rejected() {
     );
 }
 
+#[test]
+fn registered_username_can_relogin_with_same_password() {
+    let server = server_or_skip!();
+
+    // The TUI's stored-credentials flow depends on this pair of server
+    // behaviors: a fresh username is registered by simply logging in, and a
+    // later session (a "restart") with the same credentials is accepted.
+    let user = "e2e_relogin_user";
+    let mut first = Client::with_settings(server.settings(user, "pw-123"));
+    first.connect().expect("connect (registering login)");
+    assert!(
+        first.login().expect("registering login"),
+        "a fresh username should be auto-registered"
+    );
+    drop(first);
+
+    let mut second = Client::with_settings(server.settings(user, "pw-123"));
+    second.connect().expect("connect (relogin)");
+    assert!(
+        second.login().expect("relogin"),
+        "the same credentials must log in again after a restart"
+    );
+}
+
 #[test]
 fn two_clients_can_be_logged_in_together() {
     let server = server_or_skip!();

soulseek-rs/Cargo.toml

@@ -13,6 +13,13 @@ categories = ["command-line-utilities"]
 name = "soulseek-rs"
 path = "src/main.rs"
 
+# Small library target so integration tests can exercise the persistence
+# pipeline; the dependency soulseek-rs-lib already owns the `soulseek_rs`
+# crate name, hence the distinct one.
+[lib]
+name = "soulseek_rs_tui"
+path = "src/lib.rs"
+
 [lints]
 workspace = true
 

soulseek-rs/src/lib.rs

@@ -0,0 +1,6 @@
+//! Library surface of the TUI binary, exposed for integration tests.
+//! The binary itself compiles these modules directly (see `main.rs`).
+
+pub mod cli;
+pub mod models;
+pub mod persist;

soulseek-rs/src/main.rs

@@ -200,19 +200,15 @@ fn run_default_tui(
 
     let enable_listen = !resolved.disable_listener;
     let listen_port = resolved.listener_port;
-    let make_settings = move |username: String, password: String| {
-        ClientSettings {
+    let make_settings =
+        move |username: String, password: String| ClientSettings {
             username,
             password,
-            server_address: PeerAddress::new(
-                server_host.clone(),
-                server_port,
-            ),
+            server_address: PeerAddress::new(server_host.clone(), server_port),
             enable_listen,
             listen_port,
             shared_directory: shared_directory.clone(),
-        }
-    };
+        };
 
     // Clear screen and enable mouse capture before initializing TUI
     let _ =
@@ -243,8 +239,8 @@ fn run_default_tui(
 
     persist_credentials(&outcome, config_path, file_config, &secret_store);
 
-    let store = persist::paths::state_dir()
-        .map(persist::state::StateStore::new);
+    let store =
+        persist::paths::state_dir().map(persist::state::StateStore::new);
 
     launch_main_tui(
         terminal,

soulseek-rs/src/models/app_state.rs

@@ -111,6 +111,7 @@ pub struct AppState {
 }
 
 impl AppState {
+    #[must_use]
     pub fn new() -> Self {
         let mut searches_table_state = TableState::default();
         searches_table_state.select(Some(0));
@@ -166,6 +167,7 @@ impl AppState {
     }
 
     #[allow(dead_code)]
+    #[must_use]
     pub fn get_selected_search(&self) -> Option<&SearchEntry> {
         self.selected_search_index
             .and_then(|idx| self.searches.get(idx))

soulseek-rs/src/persist/config.rs

@@ -5,7 +5,7 @@ use std::path::Path;
 /// Optional settings read from `config.toml`. Every field is optional so a
 /// partial file (or none at all) is valid; unknown keys are ignored so newer
 /// configs still load in older builds.
-#[derive(Debug, Default, Clone, PartialEq, Serialize, Deserialize)]
+#[derive(Debug, Default, Clone, PartialEq, Eq, Serialize, Deserialize)]
 #[serde(default)]
 pub struct FileConfig {
     pub username: Option<String>,
@@ -54,7 +54,7 @@ impl FileConfig {
 
 /// Fully-resolved settings after layering CLI (which already includes env via
 /// clap) over the config file over built-in defaults.
-#[derive(Debug, Clone, PartialEq)]
+#[derive(Debug, Clone, PartialEq, Eq)]
 pub struct Resolved {
     pub username: Option<String>,
     pub server: String,
@@ -73,10 +73,12 @@ pub const DEFAULT_DOWNLOAD_DIR: &str = "~/Downloads";
 pub const DEFAULT_MAX_CONCURRENT_DOWNLOADS: usize = 5;
 pub const DEFAULT_SEARCH_TIMEOUT: u64 = 10;
 
-/// Layer CLI/env values over the config file over defaults. The
-/// `--disable-listener` flag can only enable the disable (a bare flag has no
-/// "explicitly off" form), so file `disable_listener = true` wins unless the
-/// flag is passed.
+/// Layer CLI/env values over the config file over defaults.
+///
+/// The `--disable-listener` flag can only enable the disable (a bare flag
+/// has no "explicitly off" form), so file `disable_listener = true` wins
+/// unless the flag is passed.
+#[must_use]
 pub fn resolve(cli: &crate::cli::Cli, file: &FileConfig) -> Resolved {
     Resolved {
         username: cli.username.clone().or_else(|| file.username.clone()),

soulseek-rs/src/persist/paths.rs

@@ -4,6 +4,7 @@ use std::path::PathBuf;
 /// Platform-appropriate locations for the config file and state directory.
 /// Overridable via `SOULSEEK_CONFIG_DIR` / `SOULSEEK_STATE_DIR` (used by the
 /// e2e tests, and handy for portable installs).
+#[must_use]
 pub fn config_file() -> Option<PathBuf> {
     if let Ok(dir) = std::env::var("SOULSEEK_CONFIG_DIR") {
         return Some(PathBuf::from(dir).join("config.toml"));
@@ -11,6 +12,7 @@ pub fn config_file() -> Option<PathBuf> {
     project_dirs().map(|d| d.config_dir().join("config.toml"))
 }
 
+#[must_use]
 pub fn state_dir() -> Option<PathBuf> {
     if let Ok(dir) = std::env::var("SOULSEEK_STATE_DIR") {
         return Some(PathBuf::from(dir));

soulseek-rs/src/persist/secret.rs

@@ -32,9 +32,10 @@ impl SecretStore for KeyringStore {
     }
 }
 
-/// Resolve the password with precedence: CLI/env (`cli_password`, already
-/// merged by clap) > OS keychain > `password_cmd` from config.toml. Returns
-/// `None` when no source has one — the caller shows the login screen.
+/// Resolve the password with precedence: CLI/env > keychain > `password_cmd`.
+///
+/// `cli_password` already has env merged in by clap. Returns `None` when no
+/// source has one — the caller shows the login screen.
 ///
 /// Keychain errors are downgraded to "not found": on headless boxes without
 /// a secret service the fallbacks must still work.

soulseek-rs/src/persist/snapshot.rs

@@ -17,6 +17,7 @@ impl Snapshot {
     /// Extract what should survive a restart. Downloads that are not yet
     /// `Completed` (including failed/timed-out ones) are marked incomplete
     /// so the next start can re-enqueue them.
+    #[must_use]
     pub fn capture(state: &AppState) -> Self {
         let downloads = state
             .downloads
@@ -25,10 +26,7 @@ impl Snapshot {
                 username: entry.download.username.clone(),
                 filename: entry.download.filename.clone(),
                 size: entry.download.size,
-                download_directory: entry
-                    .download
-                    .download_directory
-                    .clone(),
+                download_directory: entry.download.download_directory.clone(),
                 completed: matches!(
                     entry.download.status,
                     DownloadStatus::Completed
@@ -43,8 +41,12 @@ impl Snapshot {
             }
         }
 
-        let rooms =
-            state.rooms.open.iter().map(|room| room.name.clone()).collect();
+        let rooms = state
+            .rooms
+            .open
+            .iter()
+            .map(|room| room.name.clone())
+            .collect();
 
         Self {
             downloads,
@@ -80,10 +82,7 @@ mod tests {
     use std::sync::{Arc, mpsc};
     use std::time::Instant;
 
-    fn download(
-        filename: &str,
-        status: DownloadStatus,
-    ) -> DownloadEntry {
+    fn download(filename: &str, status: DownloadStatus) -> DownloadEntry {
         let (sender, _receiver) = mpsc::channel();
         DownloadEntry {
             download: Download {
@@ -114,8 +113,12 @@ mod tests {
     #[test]
     fn capture_maps_download_status_to_completed_flag() {
         let mut state = AppState::new();
-        state.downloads.push(download("done.mp3", DownloadStatus::Completed));
-        state.downloads.push(download("queued.mp3", DownloadStatus::Queued));
+        state
+            .downloads
+            .push(download("done.mp3", DownloadStatus::Completed));
+        state
+            .downloads
+            .push(download("queued.mp3", DownloadStatus::Queued));
         state.downloads.push(download(
             "failed.mp3",
             DownloadStatus::Failed(Some("nope".into())),

soulseek-rs/src/persist/state.rs

@@ -29,7 +29,8 @@ pub struct StateStore {
 }
 
 impl StateStore {
-    pub fn new(dir: PathBuf) -> Self {
+    #[must_use]
+    pub const fn new(dir: PathBuf) -> Self {
         Self { dir }
     }
 
@@ -198,9 +199,7 @@ mod tests {
     fn migrations_upgrade_old_data() {
         // Machinery test with a synthetic chain: v0 stored plain strings,
         // v1 wraps each in an object {"name": ...}.
-        #[derive(
-            Debug, PartialEq, Default, Serialize, serde::Deserialize,
-        )]
+        #[derive(Debug, PartialEq, Default, Serialize, serde::Deserialize)]
         struct Named {
             name: String,
         }
@@ -216,15 +215,11 @@ mod tests {
         }];
         let tmp = tempfile::tempdir().unwrap();
         let path = tmp.path().join("things.json");
-        std::fs::write(&path, r#"{"version": 0, "data": ["a", "b"]}"#)
-            .unwrap();
+        std::fs::write(&path, r#"{"version": 0, "data": ["a", "b"]}"#).unwrap();
         let loaded: Vec<Named> = load(&path, chain);
         assert_eq!(
             loaded,
-            vec![
-                Named { name: "a".into() },
-                Named { name: "b".into() }
-            ]
+            vec![Named { name: "a".into() }, Named { name: "b".into() }]
         );
     }
 

soulseek-rs/src/ui/login.rs

@@ -119,7 +119,7 @@ impl LoginForm {
         }
     }
 
-    fn focused_field_mut(&mut self) -> &mut String {
+    const fn focused_field_mut(&mut self) -> &mut String {
         match self.focused {
             LoginField::Username => &mut self.username,
             LoginField::Password => &mut self.password,
@@ -148,18 +148,18 @@ pub fn run_login_flow(
 ) -> Result<Option<LoginOutcome>> {
     let mut form = LoginForm::new(initial_username);
     let mut entered_via_form = false;
-    let mut attempt: Option<Receiver<Result<Client, String>>> = None;
-
-    if let Some(password) = initial_password
-        && !form.username.is_empty()
-    {
-        form.password = password;
-        form.phase = LoginPhase::Connecting;
-        attempt = Some(spawn_attempt(make_settings(
-            form.username.clone(),
-            form.password.clone(),
-        )));
-    }
+    let mut attempt: Option<Receiver<Result<Client, String>>> =
+        match initial_password {
+            Some(password) if !form.username.is_empty() => {
+                form.password = password;
+                form.phase = LoginPhase::Connecting;
+                Some(spawn_attempt(make_settings(
+                    form.username.clone(),
+                    form.password.clone(),
+                )))
+            }
+            _ => None,
+        };
 
     loop {
         terminal.draw(|frame| render(frame, &form))?;
@@ -207,9 +207,7 @@ pub fn run_login_flow(
 }
 
 /// Connect and log in on a background thread so the UI stays responsive.
-fn spawn_attempt(
-    settings: ClientSettings,
-) -> Receiver<Result<Client, String>> {
+fn spawn_attempt(settings: ClientSettings) -> Receiver<Result<Client, String>> {
     let (tx, rx) = channel();
     std::thread::spawn(move || {
         let mut client = Client::with_settings(settings);
@@ -288,13 +286,10 @@ fn render(frame: &mut Frame, form: &LoginForm) {
             "Connecting…",
             Style::default().fg(Color::Yellow),
         ))),
-        LoginPhase::Failed(message) => {
-            Paragraph::new(Line::from(Span::styled(
-                message.clone(),
-                Style::default().fg(Color::Red),
-            )))
-            .wrap(ratatui::widgets::Wrap { trim: true })
-        }
+        LoginPhase::Failed(message) => Paragraph::new(Line::from(
+            Span::styled(message.clone(), Style::default().fg(Color::Red)),
+        ))
+        .wrap(ratatui::widgets::Wrap { trim: true }),
     };
     frame.render_widget(status, rows[3]);
 

soulseek-rs/src/ui/main_tui/mod.rs

@@ -88,7 +88,8 @@ impl MainTui {
                         status: soulseek_rs::DownloadStatus::Completed,
                         sender: std::sync::mpsc::channel().0,
                         queue_position: None,
-                        metadata: Default::default(),
+                        metadata: soulseek_rs::types::DownloadMetadata::default(
+                        ),
                     },
                     receiver: None,
                 });

soulseek-rs/src/ui/mod.rs

@@ -1,6 +1,6 @@
 mod download_selector;
-pub mod login;
 mod downloads;
+pub mod login;
 mod main_tui;
 mod panes;
 mod styles;

soulseek-rs/tests/persist_e2e.rs

@@ -0,0 +1,103 @@
+//! End-to-end test of the persistence pipeline across a simulated restart:
+//! capture live-ish app state, write it through the real state files, load
+//! it back in a fresh store (a "second session"), and restore it.
+
+use soulseek_rs::DownloadStatus;
+use soulseek_rs::types::{Download, DownloadMetadata};
+use soulseek_rs_tui::models::{AppState, DownloadEntry};
+use soulseek_rs_tui::persist::config::FileConfig;
+use soulseek_rs_tui::persist::snapshot::{Snapshot, restore_searches};
+use soulseek_rs_tui::persist::state::StateStore;
+
+fn download_entry(filename: &str, status: DownloadStatus) -> DownloadEntry {
+    DownloadEntry {
+        download: Download {
+            username: "peer".into(),
+            filename: filename.into(),
+            token: 1,
+            size: 1000,
+            download_directory: "/music".into(),
+            status,
+            sender: std::sync::mpsc::channel().0,
+            queue_position: None,
+            metadata: DownloadMetadata::default(),
+        },
+        receiver: None,
+    }
+}
+
+#[test]
+fn state_survives_a_restart() {
+    let tmp = tempfile::tempdir().unwrap();
+    let state_dir = tmp.path().join("state");
+
+    // Session 1: user searched, joined rooms, and has one finished and one
+    // in-flight download when the app exits.
+    {
+        let mut state = AppState::new();
+        state
+            .downloads
+            .push(download_entry("done.flac", DownloadStatus::Completed));
+        state.downloads.push(download_entry(
+            "half.flac",
+            DownloadStatus::InProgress {
+                bytes_downloaded: 500,
+                total_bytes: 1000,
+                speed_bytes_per_sec: 1.0,
+            },
+        ));
+        restore_searches(&mut state, &["beatles".to_string()]);
+        state.rooms.focus_or_open("indie");
+
+        let store = StateStore::new(state_dir.clone());
+        let snapshot = Snapshot::capture(&state);
+        store.save_downloads(&snapshot.downloads).unwrap();
+        store.save_search_queries(&snapshot.queries).unwrap();
+        store.save_rooms(&snapshot.rooms).unwrap();
+    }
+
+    // The files on disk are versioned envelopes.
+    let raw =
+        std::fs::read_to_string(state_dir.join("downloads.json")).unwrap();
+    let parsed: serde_json::Value = serde_json::from_str(&raw).unwrap();
+    assert!(parsed.get("version").is_some(), "missing version envelope");
+
+    // Session 2: a fresh store (new process) sees the same state; the
+    // incomplete download is flagged for auto-resume.
+    let store = StateStore::new(state_dir);
+    let downloads = store.load_downloads();
+    assert_eq!(downloads.len(), 2);
+    assert!(
+        downloads
+            .iter()
+            .any(|d| d.filename == "done.flac" && d.completed)
+    );
+    assert!(
+        downloads
+            .iter()
+            .any(|d| d.filename == "half.flac" && !d.completed)
+    );
+    assert_eq!(store.load_search_queries(), vec!["beatles".to_string()]);
+    assert_eq!(store.load_rooms(), vec!["indie".to_string()]);
+
+    let mut state = AppState::new();
+    restore_searches(&mut state, &store.load_search_queries());
+    assert_eq!(state.searches[0].query, "beatles");
+}
+
+#[test]
+fn config_survives_a_restart() {
+    let tmp = tempfile::tempdir().unwrap();
+    let path = tmp.path().join("config").join("config.toml");
+
+    let config = FileConfig {
+        username: Some("alice".into()),
+        server: Some("localhost:2242".into()),
+        ..FileConfig::default()
+    };
+    config.save(&path).unwrap();
+
+    // "Second session": reload from disk.
+    let loaded = FileConfig::load(&path).unwrap();
+    assert_eq!(loaded, config);
+}