chore(repl): maybe improve repl test flakiness on the CI (denoland#23933

)

These repl tests are still a bit flaky. Let's try this.

https://github.com/denoland/deno/actions/runs/9176525869/job/25232001263

tests/util/server/src/pty.rs

@@ -9,8 +9,12 @@ use std::path::Path;
 use std::time::Duration;
 use std::time::Instant;
 
+use once_cell::sync::Lazy;
+
 use crate::strip_ansi_codes;
 
+static IS_CI: Lazy<bool> = Lazy::new(|| std::env::var("CI").is_ok());
+
 /// Points to know about when writing pty tests:
 ///
 /// - Consecutive writes cause issues where you might write while a prompt
@@ -54,7 +58,7 @@ impl Pty {
 
  pub fn is_supported() -> bool {
  let is_windows = cfg!(windows);
- if is_windows && std::env::var("CI").is_ok() {
+ if is_windows && *IS_CI {
  // the pty tests don't really start up on the windows CI for some reason
  // so ignore them for now
  eprintln!("Ignoring windows CI.");
@@ -209,7 +213,7 @@ impl Pty {
 
  #[track_caller]
  fn read_until_condition(&mut self, condition: impl FnMut(&mut Self) -> bool) {
- let duration = if std::env::var_os("CI").is_some() {
+ let duration = if *IS_CI {
  Duration::from_secs(30)
  } else {
  Duration::from_secs(15)
@@ -268,7 +272,12 @@ impl Pty {
  self.read_bytes.extend(&buf[..count]);
  }
  _ => {
- std::thread::sleep(Duration::from_millis(15));
+ // be a bit easier on the CI
+ std::thread::sleep(Duration::from_millis(if *IS_CI {
+ 100
+ } else {
+ 20
+ }));
  }
  }
  }