improve: add queue method to pending mail

src/mail/src/Contracts/Mailable.php

@@ -49,5 +49,5 @@ public function locale(string $locale): static;
     /**
      * Set the name of the mailer that should be used to send the message.
      */
-    public function mailer(string $mailer): static;
+    public function mailer(?string $mailer): static;
 }

src/mail/src/Mailable.php

@@ -143,7 +143,7 @@ class Mailable implements MailableContract, Renderable
     /**
      * The name of the mailer that should send the message.
      */
-    public string $mailer = '';
+    public ?string $mailer = null;
 
     /**
      * The rendered mailable views for testing / assertions.
@@ -1470,7 +1470,7 @@ private function ensureAttachmentsAreHydrated(): void
     /**
      * Set the name of the mailer that should send the message.
      */
-    public function mailer(string $mailer): static
+    public function mailer(?string $mailer): static
     {
         $this->mailer = $mailer;
 

src/mail/src/PendingMail.php

@@ -4,6 +4,8 @@
 
 namespace Hypervel\Mail;
 
+use DateInterval;
+use DateTimeInterface;
 use Hyperf\Conditionable\Conditionable;
 use Hypervel\Mail\Contracts\Mailable as MailableContract;
 use Hypervel\Mail\Contracts\Mailer as MailerContract;
@@ -102,6 +104,29 @@ public function sendNow(MailableContract $mailable): ?SentMessage
         return $this->mailer->sendNow($this->fill($mailable));
     }
 
+    /**
+     * Push the given mailable onto the queue.
+     */
+    public function queue(MailableContract $mailable): mixed
+    {
+        /* @phpstan-ignore-next-line */
+        return $this->mailer->queue(
+            $this->fill($mailable)
+        );
+    }
+
+    /**
+     * Deliver the queued message after (n) seconds.
+     */
+    public function later(DateInterval|DateTimeInterface|int $delay, MailableContract $mailable): mixed
+    {
+        /* @phpstan-ignore-next-line */
+        return $this->mailer->later(
+            $delay,
+            $this->fill($mailable)
+        );
+    }
+
     /**
      * Populate the mailable with the addresses.
      */

src/support/src/Testing/Fakes/MailFake.php

@@ -460,7 +460,7 @@ public function later(DateInterval|DateTimeInterface|int $delay, array|Mailable|
     /**
      * Infer mailable class using reflection if a typehinted closure is passed to assertion.
      */
-    protected function prepareMailableAndCallback(Closure|string $mailable, ?callable $callback): array
+    protected function prepareMailableAndCallback(Closure|string $mailable, callable|string|null $callback): array
     {
         if ($mailable instanceof Closure) {
             return [$this->firstClosureParameterType($mailable), $mailable];