test: refactor test-tls-ocsp-callback

refactor all var to either const/let
change all assert.equal to assert.strictEqual
change all assert.ok(...===...) to assert.strictEqual

PR-URL: nodejs#9970
Reviewed-By: Prince John Wesley <princejohnwesley@gmail.com>
Reviewed-By: Colin Ihrig <cjihrig@gmail.com>
Reviewed-By: James M Snell <jasnell@gmail.com>

test/parallel/test-tls-ocsp-callback.js

@@ -1,5 +1,5 @@
 'use strict';
-var common = require('../common');
+const common = require('../common');
 
 if (!process.features.tls_ocsp) {
   common.skip('node compiled without OpenSSL or ' +
@@ -15,33 +15,33 @@ if (!common.hasCrypto) {
   common.skip('missing crypto');
   return;
 }
-var tls = require('tls');
+const tls = require('tls');
 
-var assert = require('assert');
-var fs = require('fs');
-var join = require('path').join;
+const assert = require('assert');
+const fs = require('fs');
+const join = require('path').join;
 
 const SSL_OP_NO_TICKET = require('crypto').constants.SSL_OP_NO_TICKET;
 
-var pfx = fs.readFileSync(join(common.fixturesDir, 'keys', 'agent1-pfx.pem'));
+const pfx = fs.readFileSync(join(common.fixturesDir, 'keys', 'agent1-pfx.pem'));
 
 function test(testOptions, cb) {
 
-  var keyFile = join(common.fixturesDir, 'keys', 'agent1-key.pem');
-  var certFile = join(common.fixturesDir, 'keys', 'agent1-cert.pem');
-  var caFile = join(common.fixturesDir, 'keys', 'ca1-cert.pem');
-  var key = fs.readFileSync(keyFile);
-  var cert = fs.readFileSync(certFile);
-  var ca = fs.readFileSync(caFile);
-  var options = {
+  const keyFile = join(common.fixturesDir, 'keys', 'agent1-key.pem');
+  const certFile = join(common.fixturesDir, 'keys', 'agent1-cert.pem');
+  const caFile = join(common.fixturesDir, 'keys', 'ca1-cert.pem');
+  const key = fs.readFileSync(keyFile);
+  const cert = fs.readFileSync(certFile);
+  const ca = fs.readFileSync(caFile);
+  const options = {
     key: key,
     cert: cert,
     ca: [ca]
   };
-  var requestCount = 0;
-  var clientSecure = 0;
-  var ocspCount = 0;
-  var ocspResponse;
+  let requestCount = 0;
+  let clientSecure = 0;
+  let ocspCount = 0;
+  let ocspResponse;
 
   if (testOptions.pfx) {
     delete options.key;
@@ -50,7 +50,7 @@ function test(testOptions, cb) {
     options.passphrase = testOptions.passphrase;
   }
 
-  var server = tls.createServer(options, function(cleartext) {
+  const server = tls.createServer(options, function(cleartext) {
     cleartext.on('error', function(er) {
       // We're ok with getting ECONNRESET in this test, but it's
       // timing-dependent, and thus unreliable. Any other errors
@@ -73,7 +73,7 @@ function test(testOptions, cb) {
     }, 100);
   });
   server.listen(0, function() {
-    var client = tls.connect({
+    const client = tls.connect({
       port: this.address().port,
       requestOCSP: testOptions.ocsp !== false,
       secureOptions: testOptions.ocsp === false ?
@@ -94,23 +94,23 @@ function test(testOptions, cb) {
 
   process.on('exit', function() {
     if (testOptions.ocsp === false) {
-      assert.equal(requestCount, clientSecure);
-      assert.equal(requestCount, 1);
+      assert.strictEqual(requestCount, clientSecure);
+      assert.strictEqual(requestCount, 1);
       return;
     }
 
     if (testOptions.response) {
-      assert.equal(ocspResponse.toString(), testOptions.response);
+      assert.strictEqual(ocspResponse.toString(), testOptions.response);
     } else {
-      assert.ok(ocspResponse === null);
+      assert.strictEqual(ocspResponse, null);
     }
-    assert.equal(requestCount, testOptions.response ? 0 : 1);
-    assert.equal(clientSecure, requestCount);
-    assert.equal(ocspCount, 1);
+    assert.strictEqual(requestCount, testOptions.response ? 0 : 1);
+    assert.strictEqual(clientSecure, requestCount);
+    assert.strictEqual(ocspCount, 1);
   });
 }
 
-var tests = [
+const tests = [
   { response: false },
   { response: 'hello world' },
   { ocsp: false }