diff --git a/src/Settings.php b/src/Settings.php
index 90124f9..eb1aeb5 100644
--- a/src/Settings.php
+++ b/src/Settings.php
@@ -32,7 +32,7 @@ class Settings implements \Iterator
 	
 	private array $settings = [];
 
-	private string $appPath;
+	private string $appPath = './';
 	private ?string $pkgPath = null;
 	private ?string $site = null;
 
diff --git a/tests/SettingsTest.php b/tests/SettingsTest.php
new file mode 100644
index 0000000..1ee2e57
--- /dev/null
+++ b/tests/SettingsTest.php
@@ -0,0 +1,46 @@
+<?php
+/* {{{  Copyright and License Notice
+ *
+ * Copyright © 2021 RaBe Websolutions
+ *
+ * This file is part of rabe/Util-Settings.
+ *
+ * rabe/Util-Settings is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU Affero General Public License as published by
+ * the Free Software Foundation, either version 3 of the License, or
+ * (at your option) any later version.
+ *
+ * rabe/Util-Settings is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU Affero General Public License for more details.
+ *
+ * You should have received a copy of the GNU Affero General Public License
+ * along with rabe/Util-Settings.  If not, see <https://www.gnu.org/licenses/>.
+ *
+ *///}}}
+declare(strict_types=1);
+namespace rabe\Util\tests;
+
+use rabe\Util\Settings;
+use PHPUnit\Framework\TestCase;
+
+class SettingsTest extends TestCase
+{
+	public function testBuildFileName()
+	{
+		$path = './config/';
+		$prefix = 'VeruA';
+		$postfix = 'conf.php';
+		$type = '';
+		$defaultName = "$path$prefix.$type$postfix";
+		
+		$cfg = new Settings();
+		
+		$this->assertEquals($defaultName, $cfg->buildFileName());
+	}
+}
+
+/* jEdit buffer local properties {{{
+  * :folding=explicit:collapseFolds=1:
+}}}*/
\ No newline at end of file