diff --git a/overrides/Runner/ResultCache/DefaultResultCache.php b/overrides/Runner/ResultCache/DefaultResultCache.php
index 581a4c7f..fde6bad9 100644
--- a/overrides/Runner/ResultCache/DefaultResultCache.php
+++ b/overrides/Runner/ResultCache/DefaultResultCache.php
@@ -46,6 +46,7 @@ declare(strict_types=1);
 namespace PHPUnit\Runner\ResultCache;
 
 use const DIRECTORY_SEPARATOR;
+use const LOCK_EX;
 
 use PHPUnit\Framework\TestStatus\TestStatus;
 use PHPUnit\Runner\DirectoryCannotBeCreatedException;
@@ -65,6 +66,8 @@ use function json_encode;
 use function Pest\version;
 
 /**
+ * @no-named-arguments Parameter names are not covered by the backward compatibility promise for PHPUnit
+ *
  * @internal This class is not covered by the backward compatibility promise for PHPUnit
  */
 final class DefaultResultCache implements ResultCache
@@ -77,12 +80,12 @@ final class DefaultResultCache implements ResultCache
     private readonly string $cacheFilename;
 
     /**
-     * @psalm-var array<string, TestStatus>
+     * @var array<string, TestStatus>
      */
     private array $defects = [];
 
     /**
-     * @psalm-var array<string, float>
+     * @var array<string, float>
      */
     private array $times = [];
 
@@ -119,6 +122,17 @@ final class DefaultResultCache implements ResultCache
         return $this->times[$id] ?? 0.0;
     }
 
+    public function mergeWith(self $other): void
+    {
+        foreach ($other->defects as $id => $defect) {
+            $this->defects[$id] = $defect;
+        }
+
+        foreach ($other->times as $id => $time) {
+            $this->times[$id] = $time;
+        }
+    }
+
     public function load(): void
     {
         if (! is_file($this->cacheFilename)) {