diff --git a/tests/converters/test_base.py b/tests/converters/test_base.py
index 25014d1..4121b0e 100644
--- a/tests/converters/test_base.py
+++ b/tests/converters/test_base.py
@@ -135,16 +135,22 @@ def test_download_auxiliary_files_if_folder_not_present(self):
         with mock.patch('pathlib.Path.is_dir', return_value=False), \
                 mock.patch('os.makedirs'), \
                 mock.patch('geospaas_processing.utils.http_request') as mock_http_request, \
-                mock.patch('tarfile.open'), \
-                mock.patch('builtins.open'), \
+                mock.patch('tarfile.open') as mock_tarfile_open, \
+                mock.patch('builtins.open') as mock_open, \
                 mock.patch('pathlib.Path.iterdir', return_value=['/baz']), \
                 mock.patch('pathlib.Path.rmdir') as mock_rmdir, \
                 mock.patch('pathlib.Path.unlink') as mock_unlink, \
                 mock.patch('shutil.move') as mock_move, \
                 mock.patch.object(TestConversionManager, 'make_symlink') as mock_make_symlink:
+            mock_chunk = mock.MagicMock()
+            (mock_http_request.return_value.__enter__.return_value
+             .iter_content.return_value) = iter([mock_chunk])
             TestConversionManager.download_auxiliary_files()
+
         mock_http_request.assert_called()
         mock_http_request.return_value.__enter__.return_value.iter_content.assert_called()
+        mock_open.return_value.__enter__.return_value.write.assert_called_with(mock_chunk)
+        mock_tarfile_open.assert_called()
         mock_rmdir.assert_called()
         mock_unlink.assert_called()
         mock_move.assert_called()