Gaps in ExtensionArray test coverage

[TomAugspurger]

We need tests that assert

1. fillna raises when passed an array of the wrong length
2. fillna returns a copy when there are no missing value
3. take raises when passed an invalid object for fill_value (may be somewhat tricky to do in a base test).

These tests would go in https://github.com/pandas-dev/pandas/blob/master/pandas/tests/extension/base/methods.py and https://github.com/pandas-dev/pandas/blob/master/pandas/tests/extension/base/getitem.py

[thoo]

@TomAugspurger I am going to work on this.

[TomAugspurger]

OK thanks. If writing a test for take seems difficult, feel free to just fix the fillna ones.

…

On Fri, Oct 19, 2018 at 1:13 PM Thein Oo ***@***.***> wrote: @TomAugspurger <https://github.com/TomAugspurger> I am going to work on this. — You are receiving this because you were mentioned. Reply to this email directly, view it on GitHub <#23241 (comment)>, or mute the thread <https://github.com/notifications/unsubscribe-auth/ABQHItiGr5sDuw4WbkNK4NrmPQi-sSvpks5umhRLgaJpZM4XxGVP> .

[thoo]

@TomAugspurger Thanks.

[thoo]

@TomAugspurger It is not done yet. I just want to make sure I am on the right track. Could you please take a look? Thanks.