Unit test failures on Python 3.11

[amolenaar]

Describe the bug

context

When I run the unit tests on my Linux machine (Fedora 37), 5 tests fail.

expectation I expected all tests to pass.

bug

Instead 5 tests fail.

$ pip install -e '.[testing]'
...
$ pytest
...
FAILED tests/test_execute.py::test_basic_failing_cache - AssertionError: FILES DIFFER:
FAILED tests/test_execute.py::test_basic_failing_auto - AssertionError: FILES DIFFER:
FAILED tests/test_execute.py::test_basic_failing_inline - AssertionError: FILES DIFFER:
FAILED tests/test_execute.py::test_allow_errors_cache - AssertionError: FILES DIFFER:
FAILED tests/test_execute.py::test_allow_errors_auto - AssertionError: FILES DIFFER:

$ pytest tests/test_execute.py::test_basic_failing_inline
...
## inserted before test_basic_failing_inline.ipynb/cells/1/outputs/0/traceback/2:
+  item[0]:
+    Input In [1], in <cell line: 1>()
+    ----> 1 raise Exception('oopsie!')

## deleted test_basic_failing_inline.ipynb/cells/1/outputs/0/traceback/2:
-  item[0]:
-    Input In [1], in <cell line: 0>()
-    ----> 1 raise Exception('oopsie!')

problem It looks like the first line in the cell is referred to as 0, instead of line1.

See also build job https://github.com/amolenaar/MyST-NB/actions/runs/3914854447/jobs/6692383353.

Reproduce the bug

1. check out Myst-NB
2. Install `pip install -e '.[testing]'
3. Run pytest
4. See stuff fail

List your environment

Python 3.11.1

Shortened pip list:

Package                       Version     Editable project location
----------------------------- ----------- -------------------------------
ipykernel                     5.5.6
ipython                       8.4.0
ipython-genutils              0.2.0
ipywidgets                    8.0.4
jupyter-cache                 0.5.0
jupyter_client                7.4.9
jupyter_core                  5.1.3
jupyter-events                0.6.3
jupyter_server                2.1.0
jupyter-server-mathjax        0.2.6
jupyter_server_terminals      0.4.4
jupyterlab-pygments           0.2.2
jupyterlab-widgets            3.0.5
jupytext                      1.11.5
markdown-it-py                1.1.0
MarkupSafe                    2.1.1
myst-nb                       0.17.1      /home/arjan/Development/MyST-NB
myst-parser                   0.18.1
nbclient                      0.5.13
nbconvert                     7.2.7
nbdime                        3.1.1
nbformat                      5.7.3
pytest                        7.2.0
Sphinx                        5.3.0

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