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src/Actions/LoadStructure.php

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+<?php
+
+declare(strict_types=1);
+
+namespace Pest\Actions;
+
+use Pest\Support\Str;
+use PHPUnit\TextUI\Configuration\Configuration;
+use PHPUnit\Util\FileLoader;
+use RecursiveDirectoryIterator;
+use RecursiveIteratorIterator;
+
+/**
+ * @internal
+ */
+final class LoadStructure
+{
+    /**
+     * The Pest convention.
+     *
+     * @var array<int, string>
+     */
+    private const STRUCTURE = [
+        'Datasets.php',
+        'Pest.php',
+        'Datasets',
+    ];
+
+    /**
+     * Validates the configuration in the given `configuration`.
+     */
+    public static function in(string $rootPath): void
+    {
+        $testsPath = $rootPath . DIRECTORY_SEPARATOR . 'tests';
+
+        $load = function ($filename): bool {
+            return file_exists($filename) && (bool) FileLoader::checkAndLoad($filename);
+        };
+
+        foreach (self::STRUCTURE as $filename) {
+            $filename = sprintf('%s%s%s', $testsPath, DIRECTORY_SEPARATOR, $filename);
+
+            if (!file_exists($filename)) {
+                continue;
+            }
+
+            if (is_dir($filename)) {
+                $directory = new RecursiveDirectoryIterator($filename);
+                $iterator  = new RecursiveIteratorIterator($directory);
+                foreach ($iterator as $file) {
+                    $filename = $file->__toString();
+                    if (Str::endsWith($filename, '.php') && file_exists($filename)) {
+                        require_once $filename;
+                    }
+                }
+            } else {
+                $load($filename);
+            }
+        }
+    }
+}