test: enable mustCall() during child exit

PR-URL: #16915
Reviewed-By: Khaidi Chu <[email protected]>
Reviewed-By: Gireesh Punathil <[email protected]>
Reviewed-By: James M Snell <[email protected]>
Reviewed-By: Colin Ihrig <[email protected]>
Reviewed-By: Anatoli Papirovski <[email protected]>
Reviewed-By: Franziska Hinkelmann <[email protected]>

Author: vipinmenon

test/parallel/test-process-raw-debug.js

@@ -1,5 +1,5 @@
 'use strict';
-require('../common');
+const common = require('../common');
 const assert = require('assert');
 const os = require('os');
 
@@ -29,10 +29,10 @@ function parent() {
     console.log('ok - got expected message');
   });
 
-  child.on('exit', function(c) {
+  child.on('exit', common.mustCall(function(c) {
     assert(!c);
     console.log('ok - child exited nicely');
-  });
+  }));
 }
 
 function child() {