test: add test for reused AbortController with execfile()

Test that reusing an aborted AbortController with execfile() results in
immediate SIGTERM.
PR-URL: #36644
Reviewed-By: Benjamin Gruenbaum <benjamingr@gmail.com>
Reviewed-By: Daijiro Wachi <daijiro.wachi@gmail.com>

Author: Trott

test/parallel/test-child-process-execfile.js

@@ -54,11 +54,24 @@ const execOpts = { encoding: 'utf8', shell: true };
 constac=newAbortController();
 const{ signal }=ac;
 
-constcallback=common.mustCall((err)=>{
+constfirstCheck=common.mustCall((err)=>{
 assert.strictEqual(err.code,'ABORT_ERR');
 assert.strictEqual(err.name,'AbortError');
+assert.strictEqual(err.signal,undefined);
+});
+
+constsecondCheck=common.mustCall((err)=>{
+assert.strictEqual(err.code,null);
+assert.strictEqual(err.name,'Error');
+assert.strictEqual(err.signal,'SIGTERM');
 });
-execFile(process.execPath,[echoFixture,0],{ signal },callback);
+
+execFile(process.execPath,[echoFixture,0],{ signal },(err)=>{
+firstCheck(err);
+// Test that re-using the aborted signal results in immediate SIGTERM.
+execFile(process.execPath,[echoFixture,0],{ signal },secondCheck);
+});
+
 ac.abort();
 }