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tests/_support/Cache/RestrictiveHandler.php

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+<?php
+
+/**
+ * This file is part of CodeIgniter 4 framework.
+ *
+ * (c) CodeIgniter Foundation <admin@codeigniter.com>
+ *
+ * For the full copyright and license information, please view
+ * the LICENSE file that was distributed with this source code.
+ */
+
+namespace Tests\Support\Cache;
+
+use CodeIgniter\Cache\Handlers\DummyHandler;
+
+/**
+ * Handler with unnecessarily restrictive
+ * key limit for testing validateKey.
+ */
+class RestrictiveHandler extends DummyHandler
+{
+    /**
+     * Maximum key length.
+     */
+    public const MAX_KEY_LENGTH = 10;
+}