adding benchmarking tool

bench.js

@@ -0,0 +1,111 @@
+const httpNext = require('./index')
+const httpPrevious = require('0http')
+
+function getReqObject (url) {
+  const req = {}
+  req.method = 'GET'
+  req.url = url
+
+  return req
+}
+
+function getResObject () {
+  const res = {}
+  res.statusCode = null
+  res.setHeader = () => {}
+  res.writeHead = () => {}
+  res.end = () => {}
+  return res
+}
+
+function setupRouter (router) {
+  router.use((req, res, next) => {
+    return next()
+  })
+
+  router.get('/', (req, res) => {
+    return res.end('OK')
+  })
+  router.get('/:id', (req, res) => {
+    return res.end(req.params.id)
+  })
+  router.get('/:id/error', () => {
+    throw new Error('Error')
+  })
+}
+
+const { router } = httpNext({
+  cacheSize: 0,
+  id: '/'
+})
+setupRouter(router)
+
+const { router: routerPrevious } = httpPrevious({
+  cacheSize: 0
+})
+setupRouter(routerPrevious)
+
+import('mitata/src/cli.mjs').then(({ run, bench, group, baseline }) => {
+  group('Next Router', () => {
+    baseline('Base URL', () => {
+      const req = getReqObject('/')
+      const res = getResObject()
+
+      router.lookup(req, res)
+    })
+    bench('Parameter URL', () => {
+      const req = getReqObject('/0')
+      const res = getResObject()
+
+      router.lookup(req, res)
+    })
+    bench('Not Found URL', () => {
+      const req = getReqObject('/0/404')
+      const res = getResObject()
+
+      router.lookup(req, res)
+    })
+    bench('Error URL', () => {
+      const req = getReqObject('/0/error')
+      const res = getResObject()
+
+      router.lookup(req, res)
+    })
+  })
+
+  group('Previous Router', () => {
+    baseline('Base URL', () => {
+      const req = getReqObject('/')
+      const res = getResObject()
+
+      routerPrevious.lookup(req, res)
+    })
+    bench('Parameter URL', () => {
+      const req = getReqObject('/0')
+      const res = getResObject()
+
+      routerPrevious.lookup(req, res)
+    })
+    bench('Not Found URL', () => {
+      const req = getReqObject('/0/404')
+      const res = getResObject()
+
+      routerPrevious.lookup(req, res)
+    })
+    bench('Error URL', () => {
+      const req = getReqObject('/0/error')
+      const res = getResObject()
+
+      routerPrevious.lookup(req, res)
+    })
+  })
+
+  run({
+    silent: false,
+    avg: true,
+    json: false,
+    colors: true,
+    min_max: false,
+    percentiles: false
+  })
+})