test: change var to const for require and strict equality checks

PR-URL: #9892 Reviewed-By: Colin Ihrig <[email protected]> Reviewed-By: Luigi Pinca <[email protected]> Reviewed-By: James M Snell <[email protected]>

Author: harishtejwani

test/parallel/test-require-extensions-same-filename-as-dir.js

@@ -1,9 +1,9 @@
 'use strict';
-varcommon=require('../common');
-varassert=require('assert');
+constcommon=require('../common');
+constassert=require('assert');
 
-varcontent=require(common.fixturesDir+
+constcontent=require(common.fixturesDir+
 '/json-with-directory-name-module/module-stub/one/two/three.js');
 
-assert.notEqual(content.rocko,'artischocko');
-assert.equal(content,'hello from module-stub!');
+assert.notStrictEqual(content.rocko,'artischocko');
+assert.strictEqual(content,'hello from module-stub!');