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

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

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

1 files changed, 12 insertions, 3 deletions

diff --git a/tests/util/server/src/pty.rs b/tests/util/server/src/pty.rs
index d6102c1d6..5d8049fee 100644
--- a/tests/util/server/src/pty.rs
+++ b/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
+        }));
       }
     }
   }