Track/adjust for test failure with genno 1.23.0

[khaeru]

(Apparently) with genno 1.23.0, we see failures like this:

>       assert_qty_equal(obs, demand, check_attrs=False)

message_ix/tests/test_report.py:70: 
_ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ 

left = Index(['chicago', 'new-york', 'topeka'], dtype='object', name='n')
right = MultiIndex([( 'chicago',),
            ('new-york',),
            (  'topeka',)],
           names=['n'])
obj = 'Series.index'

    def _check_types(left, right, obj: str = "Index") -> None:
        if not exact:
            return

>       assert_class_equal(left, right, exact=exact, obj=obj)
E       AssertionError: Series.index are different
E       
E       Series.index classes are different
E       [left]:  Index(['chicago', 'new-york', 'topeka'], dtype='object', name='n')
E       [right]: MultiIndex([( 'chicago',),
E                   ('new-york',),
E                   (  'topeka',)],
E                  names=['n'])

This may actually be a regression in genno due to some housekeeping in khaeru/genno#115, that adapted AttrSeries.__init__ to address deprecation warnings with pandas 2.2. What appears to have happened is that the code now skips this block that ensures a pd.MultiIndex. So obs in this test, while functionally identical to demand, has a different index class and thus fails assert_qty_equal().

This fix is probably upstream, this is just to track.

[khaeru]

@glatterf42 my preferred temporarily mitigation here would be to install genno<1.23 in the CI workflows.

[glatterf42]

We currently have two failed tests, but when all tests first started failing, there was only one. This was on Saturday and I found these version changes:

• dask 2024.1.0 -> 2024.1.1
• genno 1.22.0 -> 1.23.0
• coverage 7.4.0 -> 7.4.1

On Sunday, the second test failure was introduced when some additional dependency updates came along:

• overrides 7.6.0 -> 7.7.0
• pytest 7.4.4 -> 8.0.0

[glatterf42]

The relevant changes in pytest might be detailed here: https://docs.pytest.org/en/stable/changelog.html#old-deprecations-are-now-errors

[glatterf42]

Partially/temporarily addressed by #789.

[khaeru]

This should be addressed in genno 1.23.1, just released.