diff --git a/tests/Unit/SecureFileUploadTest.php b/tests/Unit/SecureFileUploadTest.php
new file mode 100644
index 000000000..7f2d76123
--- /dev/null
+++ b/tests/Unit/SecureFileUploadTest.php
@@ -0,0 +1,114 @@
+<?php
+
+namespace Tests\Unit;
+
+use Tests\TestCase;
+use App\Rules\SecureFileUpload;
+use Illuminate\Http\UploadedFile;
+
+class SecureFileUploadTest extends TestCase
+{
+    /** @test */
+    public function test_validasi_pass_untuk_file_valid()
+    {
+        $rule = new SecureFileUpload(['image/jpeg'], 2048);
+        $file = UploadedFile::fake()->image('test.jpg', 100, 100);
+        
+        $hasFailed = false;
+        $rule->validate('file', $file, function($message) use (&$hasFailed) {
+            $hasFailed = true;
+        });
+        
+        $this->assertFalse($hasFailed, 'File valid seharusnya lolos validasi');
+    }
+
+    /** @test */
+    public function test_tolak_ekstensi_berbahaya_php()
+    {
+        $rule = new SecureFileUpload();
+        $file = UploadedFile::fake()->create('malicious.php', 100);
+        
+        $failMessage = null;
+        $rule->validate('file', $file, function($message) use (&$failMessage) {
+            $failMessage = $message;
+        });
+        
+        $this->assertNotNull($failMessage);
+        $this->assertStringContainsString('forbidden file extension', $failMessage);
+    }
+
+    /** @test */
+    public function test_tolak_ekstensi_berbahaya_exe()
+    {
+        $rule = new SecureFileUpload();
+        $file = UploadedFile::fake()->create('virus.exe', 100);
+        
+        $failMessage = null;
+        $rule->validate('file', $file, function($message) use (&$failMessage) {
+            $failMessage = $message;
+        });
+        
+        $this->assertStringContainsString('forbidden file extension', $failMessage);
+    }
+
+    /** @test */
+    public function test_tolak_mime_type_tidak_sesuai()
+    {
+        $rule = new SecureFileUpload(['image/jpeg'], 2048);
+        $file = UploadedFile::fake()->create('document.pdf', 100);
+        
+        $failMessage = null;
+        $rule->validate('file', $file, function($message) use (&$failMessage) {
+            $failMessage = $message;
+        });
+        
+        $this->assertNotNull($failMessage);
+        $this->assertStringContainsString('must be one of', $failMessage);
+    }
+
+    /** @test */
+    public function test_tolak_file_terlalu_besar()
+    {
+        $rule = new SecureFileUpload(['image/jpeg'], 100); // Max 100KB
+        $file = UploadedFile::fake()->create('large.jpg', 500); // 500KB
+        
+        $failMessage = null;
+        $rule->validate('file', $file, function($message) use (&$failMessage) {
+            $failMessage = $message;
+        });
+        
+        $this->assertNotNull($failMessage);
+        $this->assertStringContainsString('may not be greater than', $failMessage);
+    }
+
+    /** @test */
+    public function test_tolak_bukan_uploaded_file()
+    {
+        $rule = new SecureFileUpload();
+        
+        $failMessage = null;
+        $rule->validate('file', 'not-a-file', function($message) use (&$failMessage) {
+            $failMessage = $message;
+        });
+        
+        $this->assertStringContainsString('must be a valid file', $failMessage);
+    }
+
+    /** @test */
+    public function test_semua_ekstensi_berbahaya_ditolak()
+    {
+        $dangerousExtensions = ['php', 'phtml', 'php3', 'php4', 'php5', 'exe', 'bat', 'sh'];
+        $rule = new SecureFileUpload();
+        
+        foreach ($dangerousExtensions as $ext) {
+            $file = UploadedFile::fake()->create("malicious.{$ext}", 100);
+            
+            $failMessage = null;
+            $rule->validate('file', $file, function($message) use (&$failMessage) {
+                $failMessage = $message;
+            });
+            
+            $this->assertNotNull($failMessage, "Extension .{$ext} should be rejected");
+        }
+    }
+}
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