Add tests for the setAdditionalData method (#66)

* Add tests for the setAdditionalData method



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For more details, open the [Copilot Workspace session](https://copilot-workspace.githubnext.com/spatie/laravel-database-mail-templates?shareId=XXXX-XXXX-XXXX-XXXX).

* Fix styling

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Co-authored-by: AlexVanderbist <[email protected]>

.php-cs-fixer.cache

@@ -1 +1 @@
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tests/TemplateMailableTest.php

@@ -59,4 +59,20 @@ public function it_throws_an_exception_if_no_mail_template_exists_for_mailable()
 
         (new BasicMail('John'))->render();
     }
+
+    /** @test */
+    public function it_can_set_additional_data()
+    {
+        MailTemplate::create([
+            'mailable' => BasicMail::class,
+            'html_template' => 'Hello, {{ name }}. Your role is {{ role }}.',
+        ]);
+
+        $mailable = new BasicMail('John');
+        $mailable->setAdditionalData(['role' => 'admin']);
+
+        $renderedMail = $mailable->render();
+
+        $this->assertEquals('Hello, John. Your role is admin.', $renderedMail);
+    }
 }