Fix test_unstack

[jrm5100]

The test was failing if the ExtensionDtype had an na_value that wasn't equivalent to nan

• closes BUG: ExtensionArray test_unstack assumes missing values are nan #36986
• tests added / passed
• passes black pandas
• passes git diff upstream/master -u -- "*.py" | flake8 --diff
• whatsnew entry

[pep8speaks]

Hello @jrm5100! Thanks for updating this PR. We checked the lines you've touched for PEP 8 issues, and found:

There are currently no PEP 8 issues detected in this Pull Request. Cheers! 🍻

Comment last updated at 2020-10-08 19:24:05 UTC

[arw2019]

thanks @jrm5100 for the PR!

There's still some linting issue (according to CI you need to run black)

[TomAugspurger]

Thanks, I guess it came down to this passing

In [45]: a = pd.Series([1, np.nan], dtype=object)

In [46]: b = pd.Series([1, pd.NA], dtype=object)

In [47]: pd.testing.assert_series_equal(a, b)

FYI, we're making a list of 3rd-party extension types at https://pandas.pydata.org/pandas-docs/stable/ecosystem.html#extension-data-types, if you want to add pandas-genomics to ecosystem.rst

[TomAugspurger]

I restarted the failed numpy dev build (timed out)

[jreback]

thanks @jrm5100

[jreback]

Thanks, I guess it came down to this passing

In [45]: a = pd.Series([1, np.nan], dtype=object)

In [46]: b = pd.Series([1, pd.NA], dtype=object)

In [47]: pd.testing.assert_series_equal(a, b)

FYI, we're making a list of 3rd-party extension types at https://pandas.pydata.org/pandas-docs/stable/ecosystem.html#extension-data-types, if you want to add pandas-genomics to ecosystem.rst

shouldn't this raise as these are not equal

[TomAugspurger]

shouldn't this raise as these are not equal

I think so. Looks like it's come up in #18463 / #27613