test: add signal check to test-esm-cjs-main

PR-URL: https://github.com/nodejs/node/pull/25073
Reviewed-By: Richard Lau <riclau@uk.ibm.com>
Reviewed-By: Anto Aravinth <anto.aravinth.cse@gmail.com>
Reviewed-By: Colin Ihrig <cjihrig@gmail.com>
Reviewed-By: Daijiro Wachi <daijiro.wachi@gmail.com>
Reviewed-By: Luigi Pinca <luigipinca@gmail.com>
Reviewed-By: James M Snell <jasnell@gmail.com>

test/es-module/test-esm-cjs-main.js

@@ -21,7 +21,8 @@ child.stdout.on('data', (data) => {
   assert.strictEqual(data.toString(), 'executed\n');
   validatedExecution = true;
 });
-child.on('close', common.mustCall((code, stdout) => {
+child.on('close', common.mustCall((code, signal) => {
   assert.strictEqual(validatedExecution, true);
   assert.strictEqual(code, 0);
+  assert.strictEqual(signal, null);
 }));