test(helpers): add environment variable setup in explode env test

- Include setup for APP_DEBUG, APP_NAME, and REDIS_PORT environment variables
- Ensure test correctly evaluates environment explosions
- Improves test isolation and reliability by setting specific environment context

Author: guanguans

tests/Support/HelpersTest.php

@@ -34,6 +34,10 @@ classes(fn (string $file, string $class): bool => str($class)->startsWith('Recto
 })->group(__DIR__, __FILE__);
 
 it('can explode env', function (): void {
+    putenv('APP_DEBUG=false');
+    putenv('APP_NAME=Laravel Soar');
+    putenv('REDIS_PORT=6379');
+
     expect([
         'APP_',
         'APP_DEBUG',