[7.x] Allow including a closure in a queued chain (#31488)

*          allow including a closure in a queued chain

*    update QueueFake

*    update QueueFake

*      serialize jobs in chain

Author: themsaid

src/Illuminate/Bus/Queueable.php

@@ -2,6 +2,9 @@
 
 namespace Illuminate\Bus;
 
+use Closure;
+use Illuminate\Queue\CallQueuedClosure;
+use Illuminate\Queue\SerializableClosure;
 use Illuminate\Support\Arr;
 
 trait Queueable
@@ -142,7 +145,11 @@ public function through($middleware)
     public function chain($chain)
     {
         $this->chained = collect($chain)->map(function ($job) {
-            return serialize($job);
+            return serialize(
+                $job instanceof Closure
+                            ? new CallQueuedClosure(new SerializableClosure($job))
+                            : $job
+            );
         })->all();
 
         return $this;