Allow for creating an Auditable model even if application is not spun up

src/Auditable.php

@@ -71,7 +71,22 @@ trait Auditable
      */
     public static function bootAuditable()
     {
-        if (static::isAuditingEnabled()) {
+        try {
+            $isAuditingEnabled = static::isAuditingEnabled();
+        } catch (\RuntimeException $e) {
+            if ($e->getMessage() !== 'A facade root has not been set.') {
+                throw $e;
+            }
+
+            /**
+             * Facade root has not been set. The user may be attempting to use
+             * their Auditable outside of the application context. We will
+             * just skip booting for now.
+             */
+            return;
+        }
+
+        if ($isAuditingEnabled) {
             static::observe(new AuditableObserver());
         }
     }

tests/Unit/OutsideOfAppContextTest.php

@@ -0,0 +1,15 @@
+<?php
+
+namespace OwenIt\Auditing\Tests\Unit;
+
+use OwenIt\Auditing\Tests\Models\Article;
+use PHPUnit\Framework\TestCase;
+
+class OutsideOfAppContextTest extends TestCase
+{
+    public function test_can_create_new_model(): void
+    {
+        $article = new Article();
+        $this->assertInstanceOf(Article::class, $article);
+    }
+}