test(cli): show warm test stderr on windows

Author: miguel-heygen

.github/workflows/checkfast-measure.yml

@@ -12,7 +12,7 @@ jobs:
     strategy:
       fail-fast: false
       matrix:
-        os: [ubuntu-latest, macos-latest, windows-latest]
+        os: [windows-latest]
     env:
       HYPERFRAMES_NO_TELEMETRY: "1"
       DO_NOT_TRACK: "1"
@@ -46,7 +46,7 @@ jobs:
         run: bun run build
       - name: Measure cold vs warm, then the warm process tests
         shell: bash
-        run: bash .github/checkfast/measure.sh
+        run: cd packages/cli && npx vitest run src/warmCheck.process.test.ts --maxWorkers=1 -t "prints what a cold" 2>&1 | tail -150
       - uses: actions/upload-artifact@ea165f8d65b6e75b540449e92b4886f43607fa02 # v4
         if: always()
         with:

packages/cli/src/warmCheck.process.test.ts

@@ -62,7 +62,9 @@ function run(args: string[], env: Record<string, string>) {
   });
   let stdout = "";
   child.stdout.on("data", (data: Buffer) => (stdout += data.toString()));
-  child.stderr.on("data", () => {});
+  const tag = args[2] ?? args[0]!.split(/[\\/]/).pop();
+  child.stderr.on("data", (d: Buffer) => process.stderr.write(`[${Date.now()} ${tag} pid=${child.pid}] ${d}`));
+  child.once("close", (code) => process.stderr.write(`[${Date.now()} ${tag}] closed ${code}\n`));
   const done = new Promise<number | null>((resolve) => child.once("close", resolve));
   onTestFinished(() => stopTestProcesses(child, []));
   return { child, done, stdout: () => stdout };