test: assert process.setgroups is undefined on windows

PR-URL: #21286
Reviewed-By: Michaël Zasso <[email protected]>
Reviewed-By: Richard Lau <[email protected]>
Reviewed-By: James M Snell <[email protected]>
Reviewed-By: Luigi Pinca <[email protected]>

Author: Masashi Hirano

test/parallel/test-process-setgroups.js

@@ -1,7 +1,12 @@
 'use strict';
-require('../common');
+const common = require('../common');
 const assert = require('assert');
 
+if (common.isWindows || !common.isMainThread) {
+  assert.strictEqual(process.setgroups, undefined);
+  return;
+}
+
 assert.throws(
   () => {
     process.setgroups();