Generic/ByteOrderMark: add UTF-16 BOM character tests

Author: rodrigoprimo

src/Standards/Generic/Tests/Files/ByteOrderMarkUnitTest.1.inc

@@ -1,4 +1,4 @@
 <?php
-// File with a byte order mark (BOM) character before the opening PHP tag.
+// File with a UTF-8 byte order mark (BOM) character before the opening PHP tag.
 echo 'foo';
 ?>

src/Standards/Generic/Tests/Files/ByteOrderMarkUnitTest.4.inc

@@ -34,6 +34,8 @@ public function getErrorList($testFile='')
     {
         switch ($testFile) {
         case 'ByteOrderMarkUnitTest.1.inc':
+        case 'ByteOrderMarkUnitTest.4.inc':
+        case 'ByteOrderMarkUnitTest.5.inc':
             return [1 => 1];
 
         default: