feat: Implement cleanup methods for nonassigned article files and images in ArticleRepository

tests/Unit/Domain/Article/ArticleRepositoryTest.php

@@ -57,4 +57,46 @@ class ArticleRepositoryTest extends TestCase
 
         $this->assertNull($article);
     }
+
+    public function testDeleteNonassignedFilesDeletesDbRows(): void
+    {
+        $mockDb = $this->createMock(\medoo::class);
+
+        $mockDb->expects($this->once())
+            ->method('select')
+            ->with('pp_articles_files', '*', ['article_id' => null])
+            ->willReturn([
+                ['id' => 1, 'src' => '/this/path/does/not/exist-file.tmp']
+            ]);
+
+        $mockDb->expects($this->once())
+            ->method('delete')
+            ->with('pp_articles_files', ['article_id' => null]);
+
+        $repository = new ArticleRepository($mockDb);
+        $repository->deleteNonassignedFiles();
+
+        $this->assertTrue(true);
+    }
+
+    public function testDeleteNonassignedImagesDeletesDbRows(): void
+    {
+        $mockDb = $this->createMock(\medoo::class);
+
+        $mockDb->expects($this->once())
+            ->method('select')
+            ->with('pp_articles_images', '*', ['article_id' => null])
+            ->willReturn([
+                ['id' => 1, 'src' => '/this/path/does/not/exist-image.tmp']
+            ]);
+
+        $mockDb->expects($this->once())
+            ->method('delete')
+            ->with('pp_articles_images', ['article_id' => null]);
+
+        $repository = new ArticleRepository($mockDb);
+        $repository->deleteNonassignedImages();
+
+        $this->assertTrue(true);
+    }
 }