test: prevent extraneous HOSTNAME substitution in test-runner-output

PR-URL: #58076
Reviewed-By: Antoine du Hamel <[email protected]>
Reviewed-By: Luigi Pinca <[email protected]>
Reviewed-By: Marco Ippolito <[email protected]>
Reviewed-By: Colin Ihrig <[email protected]>
Reviewed-By: Pietro Marchini <[email protected]>
Reviewed-By: Chemi Atlow <[email protected]>

Author: Renegade334

test/parallel/test-runner-output.mjs

@@ -37,7 +37,7 @@ function replaceJunitDuration(str) {
   return str
     .replaceAll(/time="[0-9.]+"/g, 'time="*"')
     .replaceAll(/duration_ms [0-9.]+/g, 'duration_ms *')
-    .replaceAll(hostname(), 'HOSTNAME')
+    .replaceAll(`hostname="${hostname()}"`, 'hostname="HOSTNAME"')
     .replace(stackTraceBasePath, '$3');
 }