CLN: Remove redundant index test from tests/base/test_ops.py
part of #23877
- [x] tests added / passed
- [x] passes `black pandas`
- [x] passes `git diff upstream/master -u -- "*.py" | flake8 --diff`

Boolean indexing is already thoroughly tested in `test_series_mask_boolean` in `tests/indexes/test_na_indexing.py` - [see here](https://github.com/pandas-dev/pandas/blob/master/pandas/tests/indexing/test_na_indexing.py#L7-L61)
Good point @WillAyd, I'll check that later. I was assuming that if we lose coverage, then I'd get a codecov warning here in the PR. Isn't there a bot for these sort of things? We do have codecov but it’s not generally very insightful (at least for us)

Sent from my iPhone

> On Mar 7, 2020, at 1:24 AM, Martin Winkel <notifications@github.com> wrote:
> 
> ﻿
> Good point @WillAyd, I'll check that later. I was assuming that if we lose coverage, then I'd get a codecov warning here in the PR. Isn't there a bot for these sort of things?
> 
> —
> You are receiving this because you were mentioned.
> Reply to this email directly, view it on GitHub, or unsubscribe.
 @WillAyd I think this is ready for another review now. I added an `indexer_class` parametrization to `test_series_mask_boolean` and refactored the test a little bit (which I mostly had to do to get it passing)
 looks ok, will have to look again after @WillAyd comments are addressed. @jreback I addressed all comments of @WillAyd (added the lost test cases to the parametrization of `test_series_mask_boolean`) thanks @SaturnFromTitan 