test: adjust indentation for stricter linting

ESLint 4.x has stricter linting than previous versions. We are currently
using the legacy indentation rules in the test directory. This commit
changes the indentation of files to comply with the stricter 4.x linting
and enable stricter linting in the test directory.

PR-URL: https://github.com/nodejs/node/pull/14431
Reviewed-By: Refael Ackermann <refack@gmail.com>
Reviewed-By: Vse Mozhet Byt <vsemozhetbyt@gmail.com>
Reviewed-By: Trevor Norris <trev.norris@gmail.com>

test/parallel/test-buffer-isencoding.js

@@ -3,7 +3,8 @@
 require('../common');
 const assert = require('assert');
 
-[ 'hex',
+[
+  'hex',
   'utf8',
   'utf-8',
   'ascii',
@@ -13,11 +14,13 @@ const assert = require('assert');
   'ucs2',
   'ucs-2',
   'utf16le',
-  'utf-16le' ].forEach((enc) => {
-    assert.strictEqual(Buffer.isEncoding(enc), true);
-  });
+  'utf-16le'
+].forEach((enc) => {
+  assert.strictEqual(Buffer.isEncoding(enc), true);
+});
 
-[ 'utf9',
+[
+  'utf9',
   'utf-7',
   'Unicode-FTW',
   'new gnu gun',
@@ -28,6 +31,7 @@ const assert = require('assert');
   [],
   1,
   0,
-  -1 ].forEach((enc) => {
-    assert.strictEqual(Buffer.isEncoding(enc), false);
-  });
+  -1
+].forEach((enc) => {
+  assert.strictEqual(Buffer.isEncoding(enc), false);
+});