Add PropertyHook::isFinal() helper method with tests

lib/PhpParser/Node/PropertyHook.php

@@ -2,6 +2,7 @@
 
 namespace PhpParser\Node;
 
+use PhpParser\Modifiers;
 use PhpParser\Node\Stmt\Return_;
 use PhpParser\NodeAbstract;
 
@@ -58,6 +59,13 @@ public function getReturnType() {
         return null;
     }
 
+    /**
+     * Whether the property hook is final.
+     */
+    public function isFinal(): bool {
+        return (bool) ($this->flags & Modifiers::FINAL);
+    }
+
     public function getStmts(): ?array {
         if ($this->body instanceof Expr) {
             return [new Return_($this->body)];

test/PhpParser/Node/PropertyHookTest.php

@@ -0,0 +1,34 @@
+<?php declare(strict_types=1);
+
+namespace PhpParser\Node;
+
+use PhpParser\Modifiers;
+
+class PropertyHookTest extends \PHPUnit\Framework\TestCase {
+    /**
+     * @dataProvider provideModifiers
+     */
+    public function testModifiers($modifier): void {
+        $node = new PropertyHook(
+            'get',
+            null,
+            [
+                'flags' => constant(Modifiers::class . '::' . strtoupper($modifier)),
+            ]
+        );
+
+        $this->assertTrue($node->{'is' . $modifier}());
+    }
+
+    public function testNoModifiers(): void {
+        $node = new PropertyHook('get', null);
+
+        $this->assertFalse($node->isFinal());
+    }
+
+    public static function provideModifiers() {
+        return [
+            ['final'],
+        ];
+    }
+}