Test mailables are available

app/Mail/OrderShipped.php

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+<?php
+
+namespace App\Mail;
+
+use Illuminate\Bus\Queueable;
+use Illuminate\Contracts\Queue\ShouldQueue;
+use Illuminate\Mail\Mailable;
+use Illuminate\Mail\Mailables\Content;
+use Illuminate\Mail\Mailables\Envelope;
+use Illuminate\Queue\SerializesModels;
+
+class OrderShipped extends Mailable
+{
+    use Queueable, SerializesModels;
+
+    /**
+     * Create a new message instance.
+     *
+     * @return void
+     */
+    public function __construct()
+    {
+        //
+    }
+
+    /**
+     * Get the message envelope.
+     *
+     * @return \Illuminate\Mail\Mailables\Envelope
+     */
+    public function envelope()
+    {
+        return new Envelope(
+            subject: 'Order Shipped',
+        );
+    }
+
+    /**
+     * Get the message content definition.
+     *
+     * @return \Illuminate\Mail\Mailables\Content
+     */
+    public function content()
+    {
+        return new Content(
+            markdown: 'emails.orders.shipped',
+        );
+    }
+
+    /**
+     * Get the attachments for the message.
+     *
+     * @return array
+     */
+    public function attachments()
+    {
+        return [];
+    }
+}

app/Mail/PostPublished.php

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+<?php
+
+namespace App\Mail;
+
+use Illuminate\Bus\Queueable;
+use Illuminate\Contracts\Queue\ShouldQueue;
+use Illuminate\Mail\Mailable;
+use Illuminate\Mail\Mailables\Content;
+use Illuminate\Mail\Mailables\Envelope;
+use Illuminate\Queue\SerializesModels;
+
+class PostPublished extends Mailable
+{
+    use Queueable, SerializesModels;
+
+    /**
+     * Create a new message instance.
+     *
+     * @return void
+     */
+    public function __construct()
+    {
+        //
+    }
+
+    /**
+     * Get the message envelope.
+     *
+     * @return \Illuminate\Mail\Mailables\Envelope
+     */
+    public function envelope()
+    {
+        return new Envelope(
+            subject: 'Post Published',
+        );
+    }
+
+    /**
+     * Get the message content definition.
+     *
+     * @return \Illuminate\Mail\Mailables\Content
+     */
+    public function content()
+    {
+        return new Content(
+            markdown: 'emails.posts.published',
+        );
+    }
+
+    /**
+     * Get the attachments for the message.
+     *
+     * @return array
+     */
+    public function attachments()
+    {
+        return [];
+    }
+}

resources/views/emails/orders/shipped.blade.php

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+<x-mail::message>
+# Introduction
+
+The body of your message.
+
+<x-mail::button :url="''">
+Button Text
+</x-mail::button>
+
+Thanks,<br>
+{{ config('app.name') }}
+</x-mail::message>

resources/views/emails/posts/published.blade.php

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+<x-mail::message>
+# Introduction
+
+The body of your message.
+
+<x-mail::button :url="''">
+Button Text
+</x-mail::button>
+
+Thanks,<br>
+{{ config('app.name') }}
+</x-mail::message>

tests/Feature/MailTest.php

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+<?php
+
+namespace Tests\Feature;
+
+use App\Mail\OrderShipped;
+use App\Mail\PostPublished;
+use Illuminate\Contracts\Mail\Mailable;
+use Illuminate\Foundation\Testing\RefreshDatabase;
+use Illuminate\Foundation\Testing\WithFaker;
+use Tests\TestCase;
+
+class MailTest extends TestCase
+{
+    /** @test */
+    public function mailables_are_available()
+    {
+        $postPublished = new PostPublished();
+        $orderShipped = new OrderShipped();
+
+        $this->assertInstanceOf(Mailable::class, $postPublished);
+        $this->assertInstanceOf(Mailable::class, $orderShipped);
+    }
+}