test: use duplex streams in duplex stream test

cjihrig · davidtaikocha · commit c083a200b07f · 2017-04-21T22:17:17.000+08:00
test-stream-duplex.js uses transform streams instead of the duplex stream base class. This leads to some code not being covered in the Duplex constructor. PR-URL: #12514 Reviewed-By: James M Snell <jasnell@gmail.com> Reviewed-By: Yuta Hiroto <hello@about-hiroppy.com> Reviewed-By: Luigi Pinca <luigipinca@gmail.com> Reviewed-By: David Cai <davidcai1993@yahoo.com> Reviewed-By: Daniel Bevenius <daniel.bevenius@gmail.com>
diff --git a/test/parallel/test-stream-duplex.js b/test/parallel/test-stream-duplex.js
@@ -22,7 +22,7 @@
 
 const common = require('../common');
 const assert = require('assert');
-const Duplex = require('stream').Transform;
+const Duplex = require('stream').Duplex;
 
 const stream = new Duplex({ objectMode: true });
 
