test nullable pdf params

backend/tests/Unit/Controllers/ElementControllerTest.php

@@ -278,6 +278,28 @@ class ElementControllerTest extends TestCase
         );
     }
 
+    public function testShowPdfReturns400WhenFolderIsMissing(): void
+    {
+        $response = $this->controller->showPdf(null, 'baderech.pdf');
+
+        $this->assertEquals(400, $response->getStatusCode());
+        $this->assertSame(
+            ['error' => 'folder is required'],
+            json_decode($response->getContent(), true),
+        );
+    }
+
+    public function testShowPdfReturns400WhenFileNameIsMissing(): void
+    {
+        $response = $this->controller->showPdf('short', null);
+
+        $this->assertEquals(400, $response->getStatusCode());
+        $this->assertSame(
+            ['error' => 'fileName is required'],
+            json_decode($response->getContent(), true),
+        );
+    }
+
     public function testUpdateWithIconImageReturnsElementPayload(): void
     {
         $set = $this->createSet(1, 'Baderech');

backend/tests/Unit/Element/UseCases/GetElementPdfTest.php

@@ -4,6 +4,7 @@ namespace Tests\Unit\Element\UseCases;
 
 use App\Element\UseCases\GetElementPdf\GetElementPdf;
 use App\Element\UseCases\GetElementPdf\GetElementPdfRequest;
+use App\Exceptions\BadRequestException;
 use App\Exceptions\NotFoundException;
 use Tests\Fakes\FakeFilesystem;
 use Tests\TestCase;
@@ -73,6 +74,28 @@ class GetElementPdfTest extends TestCase
         ));
     }
 
+    public function testMissingFolderThrowsBadRequest(): void
+    {
+        $this->expectException(BadRequestException::class);
+        $this->expectExceptionMessage('folder is required');
+
+        $this->useCase->execute(new GetElementPdfRequest(
+            folder: null,
+            fileName: 'baderech.pdf',
+        ));
+    }
+
+    public function testMissingFileNameThrowsBadRequest(): void
+    {
+        $this->expectException(BadRequestException::class);
+        $this->expectExceptionMessage('fileName is required');
+
+        $this->useCase->execute(new GetElementPdfRequest(
+            folder: 'short',
+            fileName: null,
+        ));
+    }
+
     public function testInvalidFileNameThrowsNotFound(): void
     {
         $this->expectException(NotFoundException::class);