benchmark: added finished benchmark

Author: avcribl

benchmark/streams/finished.js

@@ -0,0 +1,38 @@
+'use strict';
+
+const common = require('../common');
+const { Readable, Writable, Duplex, finished } = require('stream');
+
+const bench = common.createBenchmark(main, {
+  n: [1e5],
+  streamType: ['readable', 'writable', 'duplex'],
+});
+
+function main({ n, streamType }) {
+  bench.start();
+
+  for (let i = 0; i < n; i++) {
+    let stream;
+
+    switch (streamType) {
+      case 'readable':
+        stream = new Readable({ read() { this.push(null); } });
+        break;
+      case 'writable':
+        stream = new Writable({ write(chunk, enc, cb) { cb(); } });
+        stream.end();
+        break;
+      case 'duplex':
+        stream = new Duplex({
+          read() { this.push(null); },
+          write(chunk, enc, cb) { cb(); },
+        });
+        stream.end();
+        break;
+    }
+
+    finished(stream, () => {});
+  }
+
+  bench.end(n);
+}