fix(cli): limit test parallelism on Windows to avoid pipe error (#22776)

One last attempt to fix the parallelism issue on Windows.

1 files changed, 7 insertions, 0 deletions

diff --git a/cli/lsp/testing/execution.rs b/cli/lsp/testing/execution.rs
index 3c7921c88..02d037996 100644
--- a/cli/lsp/testing/execution.rs
+++ b/cli/lsp/testing/execution.rs
@@ -245,6 +245,13 @@ impl TestRun {
       unreachable!("Should always be Test subcommand.");
     };
 
+    // TODO(mmastrac): Temporarily limit concurrency in windows testing to avoid named pipe issue:
+    // *** Unexpected server pipe failure '"\\\\.\\pipe\\deno_pipe_e30f45c9df61b1e4.1198.222\\0"': 3
+    // This is likely because we're hitting some sort of invisible resource limit
+    // This limit is both in cli/lsp/testing/execution.rs and cli/tools/test/mod.rs
+    #[cfg(windows)]
+    let concurrent_jobs = std::cmp::min(concurrent_jobs, 4);
+
     let (test_event_sender_factory, mut receiver) = create_test_event_channel();
     let fail_fast_tracker = FailFastTracker::new(fail_fast);