From 979b09f15e82936f59e6bfd26760c39ab7107592 Mon Sep 17 00:00:00 2001
From: robobun <117481402+robobun@users.noreply.github.com>
Date: Sat, 6 Jun 2026 02:00:40 +0000
Subject: [PATCH] test: strip inherited npm_config_user_agent from bunEnv

An outer bun run (e.g. launching the suite via bun bd test) injects
npm_config_user_agent into the test runner's environment. Spawned buns
keep a pre-existing value (put_default in run_command.rs), so the bunx
user agent test compared the outer bun's user agent against the inner
bun's Bun.version and failed whenever the two versions differ.
---
 test/harness.ts | 5 +++++
 1 file changed, 5 insertions(+)

diff --git a/test/harness.ts b/test/harness.ts
index ba13c607199b..541439ee1e90 100644
--- a/test/harness.ts
+++ b/test/harness.ts
@@ -66,6 +66,11 @@ export const bunEnv: NodeJS.Dict<string> = {
   // Strip ad-hoc JSC debug options that may be set on CI agents — they leak
   // a "WARNING: failed to parse" line to stderr that breaks snapshot tests.
   JSC_useJIT: undefined,
+  // Strip the user agent injected by an outer `bun run` (e.g. when the suite
+  // is launched via `bun bd test`). Spawned buns honor a pre-existing value
+  // (put_default in run_command.rs), so tests asserting on the user agent
+  // would otherwise see the outer bun's version instead of bunExe()'s.
+  npm_config_user_agent: undefined,
   GITHUB_ACTIONS: "false",
   BUN_DEBUG_QUIET_LOGS: "1",
   NO_COLOR: "1",