squash: make test.js follow test style guidelines

Author: danbev

test/addons/errno-exception/test.js

@@ -1,8 +1,14 @@
 'use strict';
+
 const common = require('../../common');
+
+// Verify that the path argument to node::ErrnoException() can contain UTF-8
+// characters.
+
 const assert = require('assert');
 const binding = require(`./build/${common.buildType}/binding`);
 const err = binding.errno();
+
 assert.strictEqual(err.syscall, 'syscall');
 assert.strictEqual(err.errno, 10);
 assert.strictEqual(err.path, 'päth');