Add a test for error.tar.gz file

Author: Andrew-S-Rosen

tests/vasp/test_handlers.py

@@ -3,6 +3,7 @@
 import datetime
 import os
 import shutil
+import tarfile
 from glob import glob
 
 import pytest
@@ -1018,6 +1019,9 @@ def test_check_correct(self) -> None:
         assert dct["errors"] == ["Positive energy"]
 
         assert os.path.isfile("error.1.tar.gz")
+        with tarfile.open("error1.tar.gz", "r:gz") as tar:
+            assert len(tar.getmembers()) > 0
+        
 
         incar = Incar.from_file("INCAR")