test: add tests of querystring benchmark

PR-URL: nodejs/node#16052
Reviewed-By: Evan Lucas <evanlucas@me.com>
Reviewed-By: Timothy Gu <timothygu99@gmail.com>
Reviewed-By: Joyee Cheung <joyeec9h3@gmail.com>

Author: jeskew

test/parallel/test-benchmark-querystring.js

@@ -0,0 +1,11 @@
+'use strict';
+
+require('../common');
+
+const runBenchmark = require('../common/benchmark');
+
+runBenchmark('querystring', [
+  'n=1',
+  'input="there is nothing to unescape here"',
+  'type=noencode'
+]);