diff --git a/Tests/BackCompat/BCFile/FindExtendedClassNameTest.inc b/Tests/BackCompat/BCFile/FindExtendedClassNameTest.inc
index d8bb1b58..d4669254 100644
--- a/Tests/BackCompat/BCFile/FindExtendedClassNameTest.inc
+++ b/Tests/BackCompat/BCFile/FindExtendedClassNameTest.inc
@@ -47,6 +47,12 @@ class testFECNClassThatImplementsAndExtends implements InterfaceA, InterfaceB ex
 /* testInterfaceMultiExtends */
 interface Multi extends \Package\FooInterface, \BarInterface {};
 
+/* testExtendedReadonlyAnonClass */
+$anon = new readonly class() extends \Fully\Qualified\MyClass {};
+
+/* testExtendedAnonClassWithAttributes */
+$anon = new #[SomeAttribute] class( $p ) extends Partially\Qualified\MyClass {};
+
 /* testMissingExtendsName */
 class testMissingExtendsName extends { /* missing classname */ } // Intentional parse error.
 
diff --git a/Tests/BackCompat/BCFile/FindExtendedClassNameTest.php b/Tests/BackCompat/BCFile/FindExtendedClassNameTest.php
index 2adc29cf..293681cf 100644
--- a/Tests/BackCompat/BCFile/FindExtendedClassNameTest.php
+++ b/Tests/BackCompat/BCFile/FindExtendedClassNameTest.php
@@ -161,6 +161,14 @@ public static function dataExtendedClass()
                 'identifier' => '/* testInterfaceMultiExtends */',
                 'expected'   => '\Package\FooInterface',
             ],
+            'readonly anon class extends fully qualified class'           => [
+                'identifier' => '/* testExtendedReadonlyAnonClass */',
+                'expected'   => '\Fully\Qualified\MyClass',
+            ],
+            'anon class with attribute extends partially qualified class' => [
+                'identifier' => '/* testExtendedAnonClassWithAttributes */',
+                'expected'   => 'Partially\Qualified\MyClass',
+            ],
             'parse error - extends keyword, but no class name' => [
                 'identifier' => '/* testMissingExtendsName */',
                 'expected'   => false,