test: refactor parallel/test-process-env.js

* Remove disabling of lint rule
* Enable commented-out test
* == -> ===
* var -> const

Author: Trott

test/parallel/test-process-env.js

@@ -1,40 +1,24 @@
 'use strict';
-/* eslint-disable max-len */
 
 require('../common');
 const assert = require('assert');
-const spawn = require('child_process').spawn;
-
-/* For the moment we are not going to support setting the timezone via the
- * environment variables. The problem is that various V8 platform backends
- * deal with timezone in different ways. The windows platform backend caches
- * the timezone value while the Linux one hits libc for every query.
-
-https://github.com/joyent/node/blob/08782931205bc4f6d28102ebc29fd806e8ccdf1f/deps/v8/src/platform-linux.cc#L339-345
-https://github.com/joyent/node/blob/08782931205bc4f6d28102ebc29fd806e8ccdf1f/deps/v8/src/platform-win32.cc#L590-596
-
-// first things first, set the timezone; see tzset(3)
-process.env.TZ = 'Europe/Amsterdam';
-
-// time difference between Greenwich and Amsterdam is +2 hours in the summer
-date = new Date('Fri, 10 Sep 1982 03:15:00 GMT');
-assert.equal(3, date.getUTCHours());
-assert.equal(5, date.getHours());
-*/
-
 
 // changes in environment should be visible to child processes
-if (process.argv[2] == 'you-are-the-child') {
-  // failed assertion results in process exiting with status code 1
+if (process.argv[2] === 'you-are-the-child') {
   assert.strictEqual(false, 'NODE_PROCESS_ENV_DELETED' in process.env);
   assert.strictEqual('42', process.env.NODE_PROCESS_ENV);
   assert.strictEqual('asdf', process.env.hasOwnProperty);
-  var hasOwnProperty = Object.prototype.hasOwnProperty;
+  const hasOwnProperty = Object.prototype.hasOwnProperty;
   const has = hasOwnProperty.call(process.env, 'hasOwnProperty');
   assert.strictEqual(true, has);
   process.exit(0);
-} else {
-  assert.strictEqual(Object.prototype.hasOwnProperty, process.env.hasOwnProperty);
+}
+
+{
+  const spawn = require('child_process').spawn;
+
+  assert.strictEqual(Object.prototype.hasOwnProperty,
+                     process.env.hasOwnProperty);
   const has = process.env.hasOwnProperty('hasOwnProperty');
   assert.strictEqual(false, has);
 
@@ -49,17 +33,37 @@ if (process.argv[2] == 'you-are-the-child') {
   delete process.env.NODE_PROCESS_ENV_DELETED;
   assert.strictEqual(false, 'NODE_PROCESS_ENV_DELETED' in process.env);
 
-  var child = spawn(process.argv[0], [process.argv[1], 'you-are-the-child']);
+  const child = spawn(process.argv[0], [process.argv[1], 'you-are-the-child']);
   child.stdout.on('data', function(data) { console.log(data.toString()); });
   child.stderr.on('data', function(data) { console.log(data.toString()); });
   child.on('exit', function(statusCode) {
-    if (statusCode != 0) {
+    if (statusCode !== 0) {
       process.exit(statusCode);  // failed assertion in child process
     }
   });
 }
 
+
 // delete should return true except for non-configurable properties
 // https://github.com/nodejs/node/issues/7960
 delete process.env.NON_EXISTING_VARIABLE;
 assert.strictEqual(true, delete process.env.NON_EXISTING_VARIABLE);
+
+/* eslint-disable max-len */
+/* For the moment we are not going to support setting the timezone via the
+ * environment variables. The problem is that various V8 platform backends
+ * deal with timezone in different ways. The windows platform backend caches
+ * the timezone value while the Linux one hits libc for every query.
+
+https://github.com/joyent/node/blob/08782931205bc4f6d28102ebc29fd806e8ccdf1f/deps/v8/src/platform-linux.cc#L339-345
+https://github.com/joyent/node/blob/08782931205bc4f6d28102ebc29fd806e8ccdf1f/deps/v8/src/platform-win32.cc#L590-596
+
+// set the timezone; see tzset(3)
+process.env.TZ = 'Europe/Amsterdam';
+
+// time difference between Greenwich and Amsterdam is +2 hours in the summer
+date = new Date('Fri, 10 Sep 1982 03:15:00 GMT');
+assert.equal(3, date.getUTCHours());
+assert.equal(5, date.getHours());
+*/
+/* eslint-enable max-len */