test: Add test for the Sprout facade

tests/Unit/Facades/SproutFacadeTest.php

@@ -0,0 +1,19 @@
+<?php
+declare(strict_types=1);
+
+namespace Sprout\Tests\Unit\Facades;
+
+use PHPUnit\Framework\Attributes\Test;
+use Sprout\Facades\Sprout;
+use Sprout\Tests\Unit\UnitTestCase;
+
+class SproutFacadeTest extends UnitTestCase
+{
+    #[Test]
+    public function usesCorrectInstance(): void
+    {
+        $sprout = $this->app->make('sprout');
+
+        $this->assertEquals($sprout, Sprout::getFacadeRoot());
+    }
+}