feat: "only" method

src/Plugins/Only.php

@@ -0,0 +1,61 @@
+<?php
+
+declare(strict_types=1);
+
+namespace Pest\Plugins;
+
+use Pest\Contracts\Plugins\Shutdownable;
+use Pest\PendingCalls\TestCall;
+
+/**
+ * @internal
+ */
+final class Only implements Shutdownable
+{
+    /**
+     * The temporary folder.
+     */
+    private const TEMPORARY_FOLDER = __DIR__
+        .DIRECTORY_SEPARATOR
+        .'..'
+        .DIRECTORY_SEPARATOR
+        .'..'
+        .DIRECTORY_SEPARATOR
+        .'.temp';
+
+    /**
+     * {@inheritDoc}
+     */
+    public function shutdown(): void
+    {
+        $lockFile = self::TEMPORARY_FOLDER.DIRECTORY_SEPARATOR.'only.lock';
+        
+        if (file_exists($lockFile)) {
+            unlink($lockFile);
+        }
+    }
+
+    /**
+     * Creates the lock file.
+     */
+    public static function enable(TestCall $testCall): void
+    {
+        $testCall->group('__pest_only');
+
+        $lockFile = self::TEMPORARY_FOLDER.DIRECTORY_SEPARATOR.'only.lock';
+
+        if (! file_exists($lockFile)) {
+            touch($lockFile);
+        }
+    }
+
+    /**
+     * Checks if "only" mode is enabled.
+     */
+    public static function isEnabled(): bool
+    {
+        $lockFile = self::TEMPORARY_FOLDER.DIRECTORY_SEPARATOR.'only.lock';
+
+        return file_exists($lockFile);
+    }
+}