Initial

tests/_support/Autoloader/FatalLocator.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\Autoloader;
+
+use CodeIgniter\Autoloader\FileLocator;
+use RuntimeException;
+
+/**
+ * Class FatalLocator
+ *
+ * A locator replacement designed to throw
+ * exceptions when used to indicate when
+ * a lookup actually happens.
+ */
+class FatalLocator extends FileLocator
+{
+    /**
+     * Throws.
+     *
+     * @param string $file   The namespaced file to locate
+     * @param string $folder The folder within the namespace that we should look for the file.
+     * @param string $ext    The file extension the file should have.
+     *
+     * @return false|string The path to the file, or false if not found.
+     */
+    public function locateFile(string $file, ?string $folder = null, string $ext = 'php')
+    {
+        $folder = $folder ?? 'null';
+
+        throw new RuntimeException("locateFile({$file}, {$folder}, {$ext})");
+    }
+
+    /**
+     * Searches through all of the defined namespaces looking for a file.
+     * Returns an array of all found locations for the defined file.
+     *
+     * Example:
+     *
+     *  $locator->search('Config/Routes.php');
+     *  // Assuming PSR4 namespaces include foo and bar, might return:
+     *  [
+     *      'app/Modules/foo/Config/Routes.php',
+     *      'app/Modules/bar/Config/Routes.php',
+     *  ]
+     */
+    public function search(string $path, string $ext = 'php', bool $prioritizeApp = true): array
+    {
+        $prioritizeApp = $prioritizeApp ? 'true' : 'false';
+
+        throw new RuntimeException("search({$path}, {$ext}, {$prioritizeApp})");
+    }
+}

tests/_support/Autoloader/UnnamespacedClass.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.
+ */
+
+class UnnamespacedClass
+{
+}

tests/_support/Autoloader/functions.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.
+ */
+
+if (! function_exists('autoload_foo')) {
+    function autoload_foo(): string
+    {
+        return 'I am autoloaded by Autoloader through $files!';
+    }
+}
+
+if (! defined('AUTOLOAD_CONSTANT')) {
+    define('AUTOLOAD_CONSTANT', 'foo');
+}