Cleanup test attachment after assertions

Author: b1ink0

plugins/webp-uploads/tests/test-load.php

@@ -1084,5 +1084,7 @@ public function test_it_should_generate_fallback_images_for_all_sizes_when_gener
 			$this->assertImageHasSizeSource( $attachment_id, $size_name, 'image/jpeg' );
 			$this->assertImageHasSizeSource( $attachment_id, $size_name, $mime_type );
 		}
+
+		wp_delete_attachment( $attachment_id );
 	}
 }