test: always suffix tmpdir

This makes temp dir names consistent whether we run in stand-alone mode, via `test.py` in single process, or in multi-process. PR-URL: #28035 Reviewed-By: Rich Trott <[email protected]> Reviewed-By: Ruben Bridgewater <[email protected]> Reviewed-By: Benjamin Gruenbaum <[email protected]> Reviewed-By: Sam Roberts <[email protected]>

Author: refack

test/common/tmpdir.js

@@ -89,11 +89,7 @@ const testRoot = process.env.NODE_TEST_DIR ?
 
 // Using a `.` prefixed name, which is the convention for "hidden" on POSIX,
 // gets tools to ignore it by default or by simple rules, especially eslint.
-lettmpdirName='.tmp';
-if(process.env.TEST_THREAD_ID){
-tmpdirName+=`.${process.env.TEST_THREAD_ID}`;
-}
-
+consttmpdirName='.tmp.'+(process.env.TEST_THREAD_ID||'0');
 consttmpPath=path.join(testRoot,tmpdirName);
 
 functionrefresh(opts={}){