Validate invalidity of captured HTML in notification-sent Mails

tests/Watchers/MailNotificationTest.php

@@ -0,0 +1,60 @@
+<?php
+
+namespace Laravel\Telescope\Tests\Watchers;
+
+use Illuminate\Bus\Queueable;
+use Illuminate\Notifications\Messages\MailMessage;
+use Illuminate\Notifications\Notification as BaseNotification;
+use Illuminate\Support\Facades\Notification;
+use Laravel\Telescope\EntryType;
+use Laravel\Telescope\Tests\FeatureTestCase;
+use Laravel\Telescope\Watchers\MailWatcher;
+use Laravel\Telescope\Watchers\NotificationWatcher;
+
+class MailNotificationTest extends FeatureTestCase
+{
+    protected function getEnvironmentSetUp($app)
+    {
+        parent::getEnvironmentSetUp($app);
+
+        $app->get('config')->set('telescope.watchers', [
+            MailWatcher::class => true,
+            NotificationWatcher::class => true,
+        ]);
+
+        $app->get('config')->set('mail.driver', 'array');
+    }
+
+    /** @test */
+    public function test_mail_watcher_registers_valid_html()
+    {
+        Notification::route('mail', 'to@laravel.com')
+                    ->notify(new TestMailNotification());
+
+        $entry = $this->loadTelescopeEntries()->firstWhere('type', EntryType::MAIL);
+
+        $this->assertSame(EntryType::MAIL, $entry->type);
+
+        $doc = new \DOMDocument();
+        $doc->loadHTML($entry->content['html']);
+    }
+}
+
+class TestMailNotification extends BaseNotification
+{
+    use Queueable;
+
+    public function via($notifiable)
+    {
+        return ['mail'];
+    }
+
+    public function toMail($notifiable)
+    {
+        return (new MailMessage())
+            ->subject('Check out this awesome HTML and raw email!')
+            ->line('The introduction to the notification.')
+            ->action('Notification Action', url('/'))
+            ->line('Thank you for using our application!');
+    }
+}