Generic/LowercasedFilename: check files using short open echo tag

Includes unit tests.

package.xml

@@ -589,7 +589,8 @@ http://pear.php.net/dtd/package-2.0.xsd">
         <file baseinstalldir="PHP/CodeSniffer" name="LineLengthUnitTest.3.inc" role="test" />
         <file baseinstalldir="PHP/CodeSniffer" name="LineLengthUnitTest.4.inc" role="test" />
         <file baseinstalldir="PHP/CodeSniffer" name="LineLengthUnitTest.php" role="test" />
-        <file baseinstalldir="PHP/CodeSniffer" name="LowercasedFilenameUnitTest.inc" role="test" />
+        <file baseinstalldir="PHP/CodeSniffer" name="LowercasedFilenameUnitTest.1.inc" role="test" />
+        <file baseinstalldir="PHP/CodeSniffer" name="LowercasedFilenameUnitTest.2.inc" role="test" />
         <file baseinstalldir="PHP/CodeSniffer" name="LowercasedFilenameUnitTest.php" role="test" />
         <file baseinstalldir="PHP/CodeSniffer" name="OneClassPerFileUnitTest.inc" role="test" />
         <file baseinstalldir="PHP/CodeSniffer" name="OneClassPerFileUnitTest.php" role="test" />

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

@@ -23,7 +23,10 @@ class LowercasedFilenameSniff implements Sniff
      */
     public function register()
     {
-        return [T_OPEN_TAG];
+        return [
+            T_OPEN_TAG,
+            T_OPEN_TAG_WITH_ECHO,
+        ];
 
     }//end register()
 

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

@@ -0,0 +1,7 @@
+<?=
+
+?>
+
+<?=
+
+?>

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

@@ -21,11 +21,19 @@ class LowercasedFilenameUnitTest 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 'LowercasedFilenameUnitTest.1.inc':
+        case 'LowercasedFilenameUnitTest.2.inc':
+            return [1 => 1];
+        default:
+            return [];
+        }
 
     }//end getErrorList()