test: add mustCall() to child-process test

Add common.mustCall() check to test-child-process-stdio-big-write-end.

PR-URL: #13605
Reviewed-By: Luigi Pinca <[email protected]>
Reviewed-By: Refael Ackermann <[email protected]>
Reviewed-By: Colin Ihrig <[email protected]>
Reviewed-By: Yuta Hiroto <[email protected]>
Reviewed-By: Tobias Nießen <[email protected]>
Reviewed-By: James M Snell <[email protected]>

Author: Trott

test/parallel/test-child-process-stdio-big-write-end.js

@@ -20,7 +20,7 @@
 // USE OR OTHER DEALINGS IN THE SOFTWARE.
 
 'use strict';
-require('../common');
+const common = require('../common');
 const assert = require('assert');
 let bufsize = 0;
 
@@ -43,10 +43,10 @@ function parent() {
   child.stdout.on('data', function(c) {
     n += c;
   });
-  child.stdout.on('end', function() {
+  child.stdout.on('end', common.mustCall(function() {
     assert.strictEqual(+n, sent);
     console.log('ok');
-  });
+  }));
 
   // Write until the buffer fills up.
   let buf;