Extracted test file handling to its own class

Closes #3995

database/factories/Uploads/AttachmentFactory.php

@@ -0,0 +1,39 @@
+<?php
+
+namespace Database\Factories\Uploads;
+
+use BookStack\Auth\User;
+use BookStack\Entities\Models\Page;
+use Illuminate\Database\Eloquent\Factories\Factory;
+
+/**
+ * @extends \Illuminate\Database\Eloquent\Factories\Factory<\BookStack\Uploads\Attachment>
+ */
+class AttachmentFactory extends Factory
+{
+    /**
+     * The name of the factory's corresponding model.
+     *
+     * @var string
+     */
+    protected $model = \BookStack\Uploads\Attachment::class;
+
+    /**
+     * Define the model's default state.
+     *
+     * @return array<string, mixed>
+     */
+    public function definition()
+    {
+        return [
+            'name' => $this->faker->words(2, true),
+            'path' => $this->faker->url(),
+            'extension' => '',
+            'external' => true,
+            'uploaded_to' => Page::factory(),
+            'created_by' => User::factory(),
+            'updated_by' => User::factory(),
+            'order' => 0,
+        ];
+    }
+}