Generic/LowercasedFilename: improve code coverage

src/Standards/Generic/Sniffs/Files/LowercasedFilenameSniff.php

@@ -44,7 +44,7 @@ public function process(File $phpcsFile, $stackPtr)
     {
         $filename = $phpcsFile->getFilename();
         if ($filename === 'STDIN') {
-            return $phpcsFile->numTokens;
+            return $phpcsFile->numTokens; // @codeCoverageIgnore
         }
 
         $filename          = basename($filename);

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

@@ -20,6 +20,24 @@ final class LowercasedFilenameUnitTest extends AbstractSniffUnitTest
 {
 
 
+    /**
+     * Get a list of all test files to check.
+     *
+     * @param string $testFileBase The base path that the unit tests files will have.
+     *
+     * @return string[]
+     */
+    protected function getTestFiles($testFileBase)
+    {
+        $testFileDir = dirname($testFileBase);
+        $testFiles   = parent::getTestFiles($testFileBase);
+        $testFiles[] = $testFileDir.DIRECTORY_SEPARATOR.'lowercased_filename_unit_test.inc';
+
+        return $testFiles;
+
+    }//end getTestFiles()
+
+
     /**
      * Returns the lines where errors should occur.
      *

src/Standards/Generic/Tests/Files/lowercased_filename_unit_test.inc

@@ -0,0 +1 @@
+<?php