test: add already-aborted-controller test for spawn()

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-spawn-controller.js

@@ -5,18 +5,38 @@ const common = require('../common');
 constassert=require('assert');
 constcp=require('child_process');
 
-// Verify that passing an AbortSignal works
-constcontroller=newAbortController();
-const{ signal }=controller;
+{
+// Verify that passing an AbortSignal works
+constcontroller=newAbortController();
+const{ signal }=controller;
 
-constecho=cp.spawn('echo',['fun'],{
-encoding: 'utf8',
-shell: true,
- signal
-});
+constecho=cp.spawn('echo',['fun'],{
+encoding: 'utf8',
+shell: true,
+signal
+});
 
-echo.on('error',common.mustCall((e)=>{
-assert.strictEqual(e.name,'AbortError');
-}));
+echo.on('error',common.mustCall((e)=>{
+assert.strictEqual(e.name,'AbortError');
+}));
 
-controller.abort();
+controller.abort();
+}
+
+{
+// Verify that passing an already-aborted signal works.
+constcontroller=newAbortController();
+const{ signal }=controller;
+
+controller.abort();
+
+constecho=cp.spawn('echo',['fun'],{
+encoding: 'utf8',
+shell: true,
+ signal
+});
+
+echo.on('error',common.mustCall((e)=>{
+assert.strictEqual(e.name,'AbortError');
+}));
+}