test: refector parallel/test-http.js

* favor ’===’ over in ’==’
* favor ’assert.strictEqual’ over ’assert.equal’
* favor ’const’ over ’var’

PR-URL: https://github.com/nodejs/node/pull/8471
Reviewed-By: Anna Henningsen <anna@addaleax.net>
Reviewed-By: Colin Ihrig <cjihrig@gmail.com>
Reviewed-By: Rich Trott <rtrott@gmail.com>
Reviewed-By: Luigi Pinca <luigipinca@gmail.com>
Reviewed-By: James M Snell <jasnell@gmail.com>

test/parallel/test-http.js

@@ -1,30 +1,30 @@
 'use strict';
 require('../common');
-var assert = require('assert');
-var http = require('http');
-var url = require('url');
+const assert = require('assert');
+const http = require('http');
+const url = require('url');
 
 var responses_sent = 0;
 var responses_recvd = 0;
 var body0 = '';
 var body1 = '';
 
-var server = http.Server(function(req, res) {
-  if (responses_sent == 0) {
-    assert.equal('GET', req.method);
-    assert.equal('/hello', url.parse(req.url).pathname);
+const server = http.Server(function(req, res) {
+  if (responses_sent === 0) {
+    assert.strictEqual('GET', req.method);
+    assert.strictEqual('/hello', url.parse(req.url).pathname);
 
     console.dir(req.headers);
-    assert.equal(true, 'accept' in req.headers);
-    assert.equal('*/*', req.headers['accept']);
+    assert.strictEqual(true, 'accept' in req.headers);
+    assert.strictEqual('*/*', req.headers['accept']);
 
-    assert.equal(true, 'foo' in req.headers);
-    assert.equal('bar', req.headers['foo']);
+    assert.strictEqual(true, 'foo' in req.headers);
+    assert.strictEqual('bar', req.headers['foo']);
   }
 
-  if (responses_sent == 1) {
-    assert.equal('POST', req.method);
-    assert.equal('/world', url.parse(req.url).pathname);
+  if (responses_sent === 1) {
+    assert.strictEqual('POST', req.method);
+    assert.strictEqual('/world', url.parse(req.url).pathname);
     this.close();
   }
 
@@ -41,14 +41,14 @@ var server = http.Server(function(req, res) {
 server.listen(0);
 
 server.on('listening', function() {
-  var agent = new http.Agent({ port: this.address().port, maxSockets: 1 });
+  const agent = new http.Agent({ port: this.address().port, maxSockets: 1 });
   http.get({
     port: this.address().port,
     path: '/hello',
     headers: {'Accept': '*/*', 'Foo': 'bar'},
     agent: agent
   }, function(res) {
-    assert.equal(200, res.statusCode);
+    assert.strictEqual(200, res.statusCode);
     responses_recvd += 1;
     res.setEncoding('utf8');
     res.on('data', function(chunk) { body0 += chunk; });
@@ -56,13 +56,13 @@ server.on('listening', function() {
   });
 
   setTimeout(function() {
-    var req = http.request({
+    const req = http.request({
       port: server.address().port,
       method: 'POST',
       path: '/world',
       agent: agent
     }, function(res) {
-      assert.equal(200, res.statusCode);
+      assert.strictEqual(200, res.statusCode);
       responses_recvd += 1;
       res.setEncoding('utf8');
       res.on('data', function(chunk) { body1 += chunk; });
@@ -74,12 +74,11 @@ server.on('listening', function() {
 
 process.on('exit', function() {
   console.error('responses_recvd: ' + responses_recvd);
-  assert.equal(2, responses_recvd);
+  assert.strictEqual(2, responses_recvd);
 
   console.error('responses_sent: ' + responses_sent);
-  assert.equal(2, responses_sent);
+  assert.strictEqual(2, responses_sent);
 
-  assert.equal('The path was /hello', body0);
-  assert.equal('The path was /world', body1);
+  assert.strictEqual('The path was /hello', body0);
+  assert.strictEqual('The path was /world', body1);
 });
-