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system/Test/ReflectionHelper.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;
+
+use Closure;
+use ReflectionClass;
+use ReflectionException;
+use ReflectionMethod;
+use ReflectionObject;
+use ReflectionProperty;
+
+/**
+ * Testing helper.
+ */
+trait ReflectionHelper
+{
+    /**
+     * Find a private method invoker.
+     *
+     * @param object|string $obj    object or class name
+     * @param string        $method method name
+     *
+     * @throws ReflectionException
+     *
+     * @return Closure
+     */
+    public static function getPrivateMethodInvoker($obj, $method)
+    {
+        $refMethod = new ReflectionMethod($obj, $method);
+        $refMethod->setAccessible(true);
+        $obj = (gettype($obj) === 'object') ? $obj : null;
+
+        return static function (...$args) use ($obj, $refMethod) {
+            return $refMethod->invokeArgs($obj, $args);
+        };
+    }
+
+    /**
+     * Find an accessible property.
+     *
+     * @param object|string $obj
+     * @param string        $property
+     *
+     * @throws ReflectionException
+     *
+     * @return ReflectionProperty
+     */
+    private static function getAccessibleRefProperty($obj, $property)
+    {
+        $refClass = is_object($obj) ? new ReflectionObject($obj) : new ReflectionClass($obj);
+
+        $refProperty = $refClass->getProperty($property);
+        $refProperty->setAccessible(true);
+
+        return $refProperty;
+    }
+
+    /**
+     * Set a private property.
+     *
+     * @param object|string $obj      object or class name
+     * @param string        $property property name
+     * @param mixed         $value    value
+     *
+     * @throws ReflectionException
+     */
+    public static function setPrivateProperty($obj, $property, $value)
+    {
+        $refProperty = self::getAccessibleRefProperty($obj, $property);
+        $refProperty->setValue($obj, $value);
+    }
+
+    /**
+     * Retrieve a private property.
+     *
+     * @param object|string $obj      object or class name
+     * @param string        $property property name
+     *
+     * @throws ReflectionException
+     *
+     * @return mixed value
+     */
+    public static function getPrivateProperty($obj, $property)
+    {
+        $refProperty = self::getAccessibleRefProperty($obj, $property);
+
+        return is_string($obj) ? $refProperty->getValue() : $refProperty->getValue($obj);
+    }
+}