PHP 8.2 | PSR2/ClassDeclaration: allow for readonly classes

Includes unit test.

Ref:
* https://wiki.php.net/rfc/readonly_classes

src/Standards/PSR2/Sniffs/Classes/ClassDeclarationSniff.php

@@ -71,7 +71,7 @@ public function processOpen(File $phpcsFile, $stackPtr)
                 $blankSpace = substr($prevContent, strpos($prevContent, $phpcsFile->eolChar));
                 $spaces     = strlen($blankSpace);
 
-                if (in_array($tokens[($stackPtr - 2)]['code'], [T_ABSTRACT, T_FINAL], true) === true
+                if (in_array($tokens[($stackPtr - 2)]['code'], [T_ABSTRACT, T_FINAL, T_READONLY], true) === true
                     && $spaces !== 1
                 ) {
                     $prevContent = strtolower($tokens[($stackPtr - 2)]['content']);
@@ -89,6 +89,7 @@ public function processOpen(File $phpcsFile, $stackPtr)
                 }
             } else if ($tokens[($stackPtr - 2)]['code'] === T_ABSTRACT
                 || $tokens[($stackPtr - 2)]['code'] === T_FINAL
+                || $tokens[($stackPtr - 2)]['code'] === T_READONLY
             ) {
                 $prevContent = strtolower($tokens[($stackPtr - 2)]['content']);
                 $error       = 'Expected 1 space between %s and %s keywords; newline found';

src/Standards/PSR2/Tests/Classes/ClassDeclarationUnitTest.inc

@@ -239,3 +239,12 @@ C8
 
 foo(new class {
 });
+
+readonly
+class Test
+{
+}
+
+readonly    class Test
+{
+}

src/Standards/PSR2/Tests/Classes/ClassDeclarationUnitTest.inc.fixed

@@ -232,3 +232,11 @@ class C8
 
 foo(new class {
 });
+
+readonly class Test
+{
+}
+
+readonly class Test
+{
+}

src/Standards/PSR2/Tests/Classes/ClassDeclarationUnitTest.php

@@ -63,6 +63,8 @@ public function getErrorList()
             216 => 1,
             231 => 2,
             235 => 1,
+            244 => 1,
+            248 => 1,
         ];
 
     }//end getErrorList()