Increment the totalJobs property for the BatchFake when add some jobs (#51742)

Author: yankewei

src/Illuminate/Support/Testing/Fakes/BatchFake.php

@@ -86,6 +86,8 @@ public function add($jobs)
             $this->added[] = $job;
         }
 
+        $this->totalJobs += $jobs->count();
+
         return $this;
     }