test: add test-benchmark-buffer

Add minimal test forbuffer benchmarks.

PR-URL: https://github.com/nodejs/node/pull/15175
Reviewed-By: James M Snell <jasnell@gmail.com>
Reviewed-By: Michael Dawson <michael_dawson@ca.ibm.com

test/parallel/test-benchmark-buffer.js

@@ -0,0 +1,34 @@
+'use strict';
+
+require('../common');
+
+// Minimal test for buffer benchmarks. This makes sure the benchmarks aren't
+// completely broken but nothing more than that.
+
+const assert = require('assert');
+const fork = require('child_process').fork;
+const path = require('path');
+
+const runjs = path.join(__dirname, '..', '..', 'benchmark', 'run.js');
+const argv = ['--set', 'aligned=true',
+              '--set', 'args=1',
+              '--set', 'buffer=fast',
+              '--set', 'encoding=utf8',
+              '--set', 'len=2',
+              '--set', 'method=',
+              '--set', 'n=1',
+              '--set', 'noAssert=true',
+              '--set', 'pieces=1',
+              '--set', 'pieceSize=1',
+              '--set', 'search=@',
+              '--set', 'size=1',
+              '--set', 'source=array',
+              '--set', 'type=',
+              '--set', 'withTotalLength=0',
+              'buffers'];
+
+const child = fork(runjs, argv);
+child.on('exit', (code, signal) => {
+  assert.strictEqual(code, 0);
+  assert.strictEqual(signal, null);
+});