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system/Test/Mock/MockFileLogger.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 CodeIgniter\Test\Mock;
+
+use CodeIgniter\Log\Handlers\FileHandler;
+
+/**
+ * Class MockFileLogger
+ *
+ * Extends FileHandler, exposing some inner workings
+ */
+class MockFileLogger extends FileHandler
+{
+    /**
+     * Where would the log be written?
+     */
+    public $destination;
+
+    public function __construct(array $config)
+    {
+        parent::__construct($config);
+        $this->handles     = $config['handles'] ?? [];
+        $this->destination = $this->path . 'log-' . date('Y-m-d') . '.' . $this->fileExtension;
+    }
+}