test: use const and strictEqual in test-os-homedir-no-envvar

PR-URL: https://github.com/nodejs/node/pull/9899
Reviewed-By: James M Snell <jasnell@gmail.com>
Reviewed-By: Colin Ihrig <cjihrig@gmail.com>

test/parallel/test-os-homedir-no-envvar.js

@@ -1,28 +1,28 @@
 'use strict';
-var common = require('../common');
-var assert = require('assert');
-var cp = require('child_process');
-var os = require('os');
-var path = require('path');
+const common = require('../common');
+const assert = require('assert');
+const cp = require('child_process');
+const os = require('os');
+const path = require('path');
 
 
 if (process.argv[2] === 'child') {
   if (common.isWindows)
-    assert.equal(process.env.USERPROFILE, undefined);
+    assert.strictEqual(process.env.USERPROFILE, undefined);
   else
-    assert.equal(process.env.HOME, undefined);
+    assert.strictEqual(process.env.HOME, undefined);
 
-  var home = os.homedir();
+  const home = os.homedir();
 
-  assert.ok(typeof home === 'string');
-  assert.ok(home.indexOf(path.sep) !== -1);
+  assert.strictEqual(typeof home, 'string');
+  assert(home.includes(path.sep));
 } else {
   if (common.isWindows)
     delete process.env.USERPROFILE;
   else
     delete process.env.HOME;
 
-  var child = cp.spawnSync(process.execPath, [__filename, 'child'], {
+  const child = cp.spawnSync(process.execPath, [__filename, 'child'], {
     env: process.env
   });