Generic/ByteOrderMark: improve code coverage

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

@@ -0,0 +1,4 @@
+<?php
+// File in UTF-8 encoding with byte order mark (BOM) character before the opening PHP tag.
+echo 'foo';
+?>

src/Standards/Generic/Tests/Files/ByteOrderMarkUnitTest.2.inc

@@ -0,0 +1,3 @@
+<?php // File in UTF-8 encoding without a byte order mark (BOM) character before the opening PHP tag. ?>
+
+<p>Some HTML</p>

src/Standards/Generic/Tests/Files/ByteOrderMarkUnitTest.3.inc

@@ -0,0 +1 @@
+<p>Some HTML at the beginning of an ANSI/iso-8859-1 encoded file without a byte order mark (BOM) character</p>

src/Standards/Generic/Tests/Files/ByteOrderMarkUnitTest.php

@@ -26,11 +26,21 @@ final class ByteOrderMarkUnitTest extends AbstractSniffUnitTest
      * The key of the array should represent the line number and the value
      * should represent the number of errors that should occur on that line.
      *
+     * @param string $testFile The name of the file being tested.
+     *
      * @return array<int, int>
      */
-    public function getErrorList()
+    public function getErrorList($testFile='')
     {
-        return [1 => 1];
+        switch ($testFile) {
+        case 'ByteOrderMarkUnitTest.1.inc':
+        case 'ByteOrderMarkUnitTest.4.inc':
+        case 'ByteOrderMarkUnitTest.5.inc':
+            return [1 => 1];
+
+        default:
+            return [];
+        }
 
     }//end getErrorList()