refactor: convert var to const / let

lib/test.js

@@ -4,12 +4,11 @@
  * Module dependencies.
  */
 
-var request = require('superagent');
-var util = require('util');
-var http = require('http');
-var https = require('https');
-var assert = require('assert');
-var Request = request.Request;
+const { inspect } = require('util');
+const { STATUS_CODES } = require('http');
+const { Server } = require('https');
+const { deepStrictEqual } = require('assert');
+const { Request } = require('superagent');
 
 class Test extends Request {
   /**
@@ -42,13 +41,11 @@ class Test extends Request {
    * @api private
    */
   serverAddress(app, path) {
-    var addr = app.address();
-    var port;
-    var protocol;
+    const addr = app.address();
 
     if (!addr) this._server = app.listen(0);
-    port = app.address().port;
-    protocol = app instanceof https.Server ? 'https' : 'http';
+    const port = app.address().port;
+    const protocol = app instanceof Server ? 'https' : 'http';
     return protocol + '://127.0.0.1:' + port + path;
   }
 
@@ -114,9 +111,9 @@ class Test extends Request {
    * @api public
    */
   end(fn) {
-    var self = this;
-    var server = this._server;
-    var end = Request.prototype.end;
+    const self = this;
+    const server = this._server;
+    const end = Request.prototype.end;
 
     end.call(this, function (err, res) {
       if (server && server._handle) return server.close(localAssert);
@@ -140,14 +137,13 @@ class Test extends Request {
    * @api private
    */
   assert(resError, res, fn) {
-    var errorObj;
-    var i;
+    let errorObj;
 
     // check for unexpected network errors or server not running/reachable errors
     // when there is no response and superagent sends back a System Error
     // do not check further for other asserts, if any, in such case
     // https://nodejs.org/api/errors.html#errors_common_system_errors
-    var sysErrors = {
+    const sysErrors = {
       ECONNREFUSED: 'Connection refused',
       ECONNRESET: 'Connection reset by peer',
       EPIPE: 'Broken pipe',
@@ -164,7 +160,7 @@ class Test extends Request {
     }
 
     // asserts
-    for (i = 0; i < this._asserts.length && !errorObj; i += 1) {
+    for (let i = 0; i < this._asserts.length && !errorObj; i += 1) {
       errorObj = this._assertFunction(this._asserts[i], res);
     }
 
@@ -185,26 +181,24 @@ class Test extends Request {
    * @api private
    */// eslint-disable-next-line class-methods-use-this
   _assertBody(body, res) {
-    var isregexp = body instanceof RegExp;
-    var a;
-    var b;
+    const isRegexp = body instanceof RegExp;
 
     // parsed
-    if (typeof body === 'object' && !isregexp) {
+    if (typeof body === 'object' && !isRegexp) {
       try {
-        assert.deepStrictEqual(body, res.body);
+        deepStrictEqual(body, res.body);
       } catch (err) {
-        a = util.inspect(body);
-        b = util.inspect(res.body);
+        const a = inspect(body);
+        const b = inspect(res.body);
         return error('expected ' + a + ' response body, got ' + b, body, res.body);
       }
     } else if (body !== res.text) {
       // string
-      a = util.inspect(body);
-      b = util.inspect(res.text);
+      const a = inspect(body);
+      const b = inspect(res.text);
 
       // regexp
-      if (isregexp) {
+      if (isRegexp) {
         if (!body.test(res.text)) {
           return error('expected body ' + b + ' to match ' + body, body, res.body);
         }
@@ -223,9 +217,9 @@ class Test extends Request {
    * @api private
    */// eslint-disable-next-line class-methods-use-this
   _assertHeader(header, res) {
-    var field = header.name;
-    var actual = res.header[field.toLowerCase()];
-    var fieldExpected = header.value;
+    const field = header.name;
+    const actual = res.header[field.toLowerCase()];
+    const fieldExpected = header.value;
 
     if (typeof actual === 'undefined') return new Error('expected "' + field + '" header field');
     // This check handles header values that may be a String or single element Array
@@ -252,11 +246,9 @@ class Test extends Request {
    * @api private
    */// eslint-disable-next-line class-methods-use-this
   _assertStatus(status, res) {
-    var a;
-    var b;
     if (res.status !== status) {
-      a = http.STATUS_CODES[status];
-      b = http.STATUS_CODES[res.status];
+      const a = STATUS_CODES[status];
+      const b = STATUS_CODES[res.status];
       return new Error('expected ' + status + ' "' + a + '", got ' + res.status + ' "' + b + '"');
     }
   }
@@ -270,11 +262,9 @@ class Test extends Request {
    * @api private
    */// eslint-disable-next-line class-methods-use-this
   _assertStatusArray(statusArray, res) {
-    var b;
-    var expectedList;
     if (!statusArray.includes(res.status)) {
-      b = http.STATUS_CODES[res.status];
-      expectedList = statusArray.join(', ');
+      const b = STATUS_CODES[res.status];
+      const expectedList = statusArray.join(', ');
       return new Error(
         'expected one of "' + expectedList + '", got ' + res.status + ' "' + b + '"'
       );
@@ -290,7 +280,7 @@ class Test extends Request {
    * @api private
    */// eslint-disable-next-line class-methods-use-this
   _assertFunction(fn, res) {
-    var err;
+    let err;
     try {
       err = fn(res);
     } catch (e) {
@@ -309,11 +299,11 @@ class Test extends Request {
  */
 
 function wrapAssertFn(assertFn) {
-  var savedStack = new Error().stack.split('\n').slice(3);
+  const savedStack = new Error().stack.split('\n').slice(3);
 
   return function(res) {
-    var badStack;
-    var err = assertFn(res);
+    let badStack;
+    const err = assertFn(res);
     if (err instanceof Error && err.stack) {
       badStack = err.stack.replace(err.message, '').split('\n').slice(1);
       err.stack = [err.toString()]
@@ -337,7 +327,7 @@ function wrapAssertFn(assertFn) {
  */
 
 function error(msg, expected, actual) {
-  var err = new Error(msg);
+  const err = new Error(msg);
   err.expected = expected;
   err.actual = actual;
   err.showDiff = true;