Merge pull request #1235 from pestphp/3.x_herd_fix

Fixes parallel mutation testing when using Laravel Herd

src/Plugins/Parallel/Paratest/WrapperRunner.php

@@ -122,6 +122,8 @@ final class WrapperRunner implements RunnerInterface
             $parameters = array_merge($parameters, $options->passthruPhp);
         }
 
+        $parameters = $this->handleLaravelHerd($parameters);
+
         $parameters[] = $wrapper;
 
         $this->parameters = $parameters;
@@ -153,6 +155,21 @@ final class WrapperRunner implements RunnerInterface
         return $this->complete($result);
     }
 
+    /**
+     * Handles Laravel Herd's debug and coverage modes.
+     *
+     * @param  array<string>  $parameters
+     * @return array<string>
+     */
+    private function handleLaravelHerd(array $parameters): array
+    {
+        if (isset($_ENV['HERD_DEBUG_INI'])) {
+            return array_merge($parameters, ['-c', $_ENV['HERD_DEBUG_INI']]);
+        }
+
+        return $parameters;
+    }
+
     private function startWorkers(): void
     {
         for ($token = 1; $token <= $this->options->processes; $token++) {