Added infrastructure to do integration testing.

Cargo.toml

@@ -47,3 +47,8 @@ tracing = "0.1.40"
 
 [profile.release]
 lto = true
+
+[dev-dependencies]
+greetd-stub = "0.2.0"
+tempfile = "3.10.1"
+unicode-width = "0.1.12"

src/event.rs

@@ -1,12 +1,15 @@
 use std::time::Duration;
 
-use crossterm::event::{Event as TermEvent, EventStream, KeyEvent};
+use crossterm::event::{Event as TermEvent, KeyEvent};
 use futures::{future::FutureExt, StreamExt};
 use tokio::{
   process::Command,
   sync::mpsc::{self, Sender},
 };
 
+#[cfg(not(test))]
+use crossterm::event::EventStream;
+
 use crate::AuthStatus;
 
 const FRAME_RATE: f64 = 2.0;
@@ -31,7 +34,14 @@ impl Events {
       let tx = tx.clone();
 
       async move {
+        #[cfg(not(test))]
         let mut stream = EventStream::new();
+
+        // In tests, we are not capturing events from the terminal, so we need
+        // to replace the crossterm::EventStream with a dummy pending stream.
+        #[cfg(test)]
+        let mut stream = futures::stream::pending::<Result<TermEvent, ()>>();
+
         let mut render_interval = tokio::time::interval(Duration::from_secs_f64(1.0 / FRAME_RATE));
 
         loop {

src/greeter.rs

@@ -193,6 +193,7 @@ impl Greeter {
       selected: 0,
     };
 
+    #[cfg(not(test))]
     greeter.parse_options().await;
 
     greeter.sessions = Menu {