better wording

Co-authored-by: Júlia Mir Pedrol <mirp.julia@gmail.com>

tests/test_download.py

@@ -181,7 +181,7 @@ def test_singularity_pull_image_singularity_installed(self, tmp_dir, mock_rich_p
     # If Singularity is not installed, it raises a FileNotFoundError because the singularity command can't be found.
     @pytest.mark.skipif(
         shutil.which("singularity") is not None,
-        reason="Can't test how the code behaves if sungularity is not installed if it is.",
+        reason="Can't test how the code behaves when sungularity is not installed if it is.",
     )
     @with_temporary_folder
     @mock.patch("rich.progress.Progress.add_task")