diff --git a/tests/ncc/Utilities/SecurityTest.php b/tests/ncc/Utilities/SecurityTest.php
new file mode 100644
index 0000000..b8cad19
--- /dev/null
+++ b/tests/ncc/Utilities/SecurityTest.php
@@ -0,0 +1,103 @@
+<?php
+/*
+ * Copyright (c) Nosial 2022-2024, all rights reserved.
+ *
+ *  Permission is hereby granted, free of charge, to any person obtaining a copy of this software and
+ *  associated documentation files (the "Software"), to deal in the Software without restriction, including without
+ *  limitation the rights to use, copy, modify, merge, publish, distribute, sublicense, and/or sell copies of the
+ *  Software, and to permit persons to whom the Software is furnished to do so, subject to the following
+ *  conditions:
+ *
+ *  The above copyright notice and this permission notice shall be included in all copies or substantial portions
+ *  of the Software.
+ *
+ *  THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR IMPLIED,
+ *  INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, FITNESS FOR A PARTICULAR
+ *  PURPOSE AND NON-INFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE
+ *  LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR
+ *  OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER
+ *  DEALINGS IN THE SOFTWARE.
+ *
+ */
+
+namespace ncc\Utilities;
+
+use PHPUnit\Framework\TestCase;
+
+/**
+ * PHPUnit test case for the Security class
+ */
+class SecurityTest extends TestCase
+{
+    /**
+     * Test sanitizeFilename with beautify set to true
+     */
+    public function testSanitizeFilenameWithBeautify(): void
+    {
+        $filename = '[]unsafe..FILE//NAM*E_.php';
+        $expected = 'unsafe.file-nam-e.php';
+        $result = Security::sanitizeFilename($filename, true);
+
+        $this->assertEquals($expected, $result);
+    }
+
+    /**
+     * Test sanitizeFilename with beautify set to false
+     */
+    public function testSanitizeFilenameWithoutBeautify(): void
+    {
+        $filename = '[]unsafe..FILE//NAM*E_.php';
+        $expected = 'unsafe..FILE--NAM-E_.php';
+        $result = Security::sanitizeFilename($filename, false);
+
+        $this->assertEquals($expected, $result);
+    }
+
+    /**
+     * Test sanitizeFilename with unicode characters
+     */
+    public function testSanitizeFilenameWithUnicode(): void
+    {
+        $filename = 'оȕȵȴȁȕfȅ_-.php';
+        $expected = 'оȕȵȴȁȕfȅ.php';
+        $result = Security::sanitizeFilename($filename, true);
+
+        $this->assertEquals($expected, $result);
+    }
+
+    /**
+     * Test sanitizeFilename with a very long file name
+     */
+    public function testSanitizeFilenameWithLongFileName(): void
+    {
+        $filename = str_repeat("a", 300) . '.php';
+        $expected = str_repeat("a", 251) . '.php';
+        $result = Security::sanitizeFilename($filename, true);
+
+        $this->assertEquals(strlen($expected), strlen($result));
+    }
+
+    /**
+     * Test beautifyFilename with multiple special characters
+     */
+    public function testBeautifyFilenameWithSpecialChars(): void
+    {
+        $filename = '..unnecessary//_underscores___and..dots//extra..stuff..';
+        $expected = 'unnecessary//-underscores-and.dots//extra.stuff';
+        $result = Security::beautifyFilename($filename);
+
+        $this->assertEquals($expected, $result);
+    }
+
+    /**
+     * Test beautifyFilename with lowercase-leters and special charecters
+     */
+    public function testBeautifyFilenameWithLowerCaseAndSpecial(): void
+    {
+        $filename = '..__Some__TEXT__with....CAPITALS__and..dots//extra..stuff__..';
+        $expected = 'some-text-with.capitals-and.dots//extra.stuff';
+        $result = Security::beautifyFilename($filename);
+
+        $this->assertEquals($expected, $result);
+    }
+}