instances added god may help

tests/Service/Settings/SettingCacheServiceTest.php

@@ -0,0 +1,45 @@
+<?php
+
+namespace MintyPHP\Tests\Service\Settings;
+
+use MintyPHP\Service\Settings\SettingCacheService;
+use PHPUnit\Framework\TestCase;
+
+class SettingCacheServiceTest extends TestCase
+{
+    public function testGetReturnsNullForMissingKey(): void
+    {
+        $file = $this->tempFilePath();
+        file_put_contents($file, "<?php\nreturn ['app_title' => 'Demo'];\n");
+
+        $service = new SettingCacheService($file);
+        $this->assertNull($service->get('missing'));
+    }
+
+    public function testUpdateWritesAndNormalizesValues(): void
+    {
+        $file = $this->tempFilePath();
+        file_put_contents($file, "<?php\nreturn ['app_title' => 'Old'];\n");
+
+        $service = new SettingCacheService($file);
+        $this->assertTrue($service->update([
+            'app_title' => 'New',
+            'app_locale' => null,
+        ]));
+
+        $this->assertSame('New', $service->get('app_title'));
+        $this->assertNull($service->get('app_locale'));
+    }
+
+    private function tempFilePath(): string
+    {
+        $dir = sys_get_temp_dir() . '/mintyphp_settings_cache_test_' . bin2hex(random_bytes(6));
+        mkdir($dir, 0775, true);
+        $file = $dir . '/settings.php';
+
+        $this->addToAssertionCount(1);
+        $this->assertDirectoryExists($dir);
+
+        return $file;
+    }
+}