fix CI for lwt tests

test/lwt/dune

@@ -36,9 +36,12 @@
    (= %{system} "linux")
    (>= %{ocaml_version} 5.0)))
  (action
-  (with-stdout-to
-   %{targets}
-   (run ./run_echo.sh -n 10 --n-conn=2 -v))))
+  (setenv
+   CI_MODE
+   1
+   (with-stdout-to
+    %{targets}
+    (run ./run_echo.sh -n 10 --n-conn=2 -v)))))
 
 (rule
  (alias runtest)

test/lwt/echo_client.ml

@@ -1,6 +1,7 @@
 module M_lwt = Moonpool_lwt
 module Trace = Trace_core
 
+let ci_mode = Option.is_some @@ Sys.getenv_opt "CI_MODE"
 let spf = Printf.sprintf
 let await_lwt = Moonpool_lwt.await_lwt
 let ( let@ ) = ( @@ )
@@ -68,9 +69,10 @@ let main ~port ~n ~n_conn ~verbose ~msg_per_conn () : unit =
 
   Printf.printf "all done\n%!";
   let elapsed = Unix.gettimeofday () -. t0 in
-  Printf.printf "  sent %d messages in %.4fs (%.2f msg/s)\n%!" !n_msg_total
-    elapsed
-    (float !n_msg_total /. elapsed);
+  if not ci_mode then
+    Printf.printf "  sent %d messages in %.4fs (%.2f msg/s)\n%!" !n_msg_total
+      elapsed
+      (float !n_msg_total /. elapsed);
   ()
 
 let () =

test/lwt/output_echo.expected

@@ -1,7 +1,6 @@
 run echo server on port=12346
 listening on port 12346
 run echo client -p 12346 -n 10 --n-conn=2 -v
-  sent 100 messages in 0.0175s (5720.16 msg/s)
 all done
 connecting to port 12346 (10 msg per conn, 10 conns total, 2 max at a time)
 read: hello 1