add a simple benchmark

Author: mourner

bench.js

@@ -0,0 +1,22 @@
+'use strict';
+
+var tinyQueue = require('./');
+
+var N = 1000000;
+
+var data = [];
+for (var i = 0; i < N; i++) data[i] = {value: Math.random()};
+
+var q = tinyQueue(null, compare);
+
+function compare(a, b) {
+    return a.value - b.value;
+}
+
+console.time('push ' + N);
+for (i = 0; i < 1000000; i++) q.push(data[i]);
+console.timeEnd('push ' + N);
+
+console.time('pop ' + N);
+for (i = 0; i < 1000000; i++) q.pop();
+console.timeEnd('pop ' + N);

package.json

@@ -4,7 +4,7 @@
   "description": "The smallest and simplest JavaScript priority queue",
   "main": "index.js",
   "scripts": {
-    "test": "eslint index.js test.js && tape test.js"
+    "test": "eslint index.js test.js bench.js && tape test.js"
   },
   "repository": {
     "type": "git",