diff --git a/backend/tests/Unit/Controllers/ElementControllerTest.php b/backend/tests/Unit/Controllers/ElementControllerTest.php
index 67023d0..ee3203f 100644
--- a/backend/tests/Unit/Controllers/ElementControllerTest.php
+++ b/backend/tests/Unit/Controllers/ElementControllerTest.php
@@ -278,6 +278,17 @@ class ElementControllerTest extends TestCase
         );
     }
 
+    public function testShowPdfReturns400WhenFolderIsInvalid(): void
+    {
+        $response = $this->controller->showPdf('archive', 'baderech.pdf');
+
+        $this->assertEquals(400, $response->getStatusCode());
+        $this->assertSame(
+            ['error' => 'folder is invalid'],
+            json_decode($response->getContent(), true),
+        );
+    }
+
     public function testShowPdfReturns400WhenFolderIsMissing(): void
     {
         $response = $this->controller->showPdf(null, 'baderech.pdf');
@@ -289,6 +300,17 @@ class ElementControllerTest extends TestCase
         );
     }
 
+    public function testShowPdfReturns400WhenFileNameIsInvalid(): void
+    {
+        $response = $this->controller->showPdf('short', '../baderech.pdf');
+
+        $this->assertEquals(400, $response->getStatusCode());
+        $this->assertSame(
+            ['error' => 'fileName is invalid'],
+            json_decode($response->getContent(), true),
+        );
+    }
+
     public function testShowPdfReturns400WhenFileNameIsMissing(): void
     {
         $response = $this->controller->showPdf('short', null);
diff --git a/backend/tests/Unit/Element/UseCases/GetElementPdfTest.php b/backend/tests/Unit/Element/UseCases/GetElementPdfTest.php
index 3a88163..7a21def 100644
--- a/backend/tests/Unit/Element/UseCases/GetElementPdfTest.php
+++ b/backend/tests/Unit/Element/UseCases/GetElementPdfTest.php
@@ -63,10 +63,10 @@ class GetElementPdfTest extends TestCase
         );
     }
 
-    public function testInvalidFolderThrowsNotFound(): void
+    public function testInvalidFolderThrowsBadRequest(): void
     {
-        $this->expectException(NotFoundException::class);
-        $this->expectExceptionMessage('PDF not found');
+        $this->expectException(BadRequestException::class);
+        $this->expectExceptionMessage('folder is invalid');
 
         $this->useCase->execute(new GetElementPdfRequest(
             folder: 'archive',
@@ -96,10 +96,10 @@ class GetElementPdfTest extends TestCase
         ));
     }
 
-    public function testInvalidFileNameThrowsNotFound(): void
+    public function testInvalidFileNameThrowsBadRequest(): void
     {
-        $this->expectException(NotFoundException::class);
-        $this->expectExceptionMessage('PDF not found');
+        $this->expectException(BadRequestException::class);
+        $this->expectExceptionMessage('fileName is invalid');
 
         $this->useCase->execute(new GetElementPdfRequest(
             folder: 'short',