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src/Actions/ValidatesEnvironment.php

@@ -0,0 +1,42 @@
+<?php
+
+declare(strict_types=1);
+
+namespace Pest\Actions;
+
+use Pest\Exceptions\FileOrFolderNotFound;
+use Pest\TestSuite;
+
+/**
+ * @internal
+ */
+final class ValidatesEnvironment
+{
+    /**
+     * The need files on the root path.
+     *
+     * @var array<int, string>
+     */
+    private const NEEDED_FILES = [
+        'composer.json',
+        'tests',
+    ];
+
+    /**
+     * Validates the environment.
+     */
+    public static function in(TestSuite $testSuite): void
+    {
+        $rootPath = $testSuite->rootPath;
+
+        $exists = function ($neededFile) use ($rootPath): bool {
+            return file_exists(sprintf('%s%s%s', $rootPath, DIRECTORY_SEPARATOR, $neededFile));
+        };
+
+        foreach (self::NEEDED_FILES as $neededFile) {
+            if (!$exists($neededFile)) {
+                throw new FileOrFolderNotFound($neededFile);
+            }
+        }
+    }
+}