Fix import format tests/indexes/multi Part Two
- [x] partial  #23334
- [x] tests added / passed
- [ ] passes `git diff upstream/master -u -- "*.py" | flake8 --diff`
Run `isort -rc pandas/tests/indexes/`

PR is capped at 20 files. So this is not all the files modified from `pandas/tests/indexes/`. So this is Part Two of this directory `pandas/tests/indexes/`. 

Hello @thoo! Thanks for submitting the PR.

 - There are no PEP8 issues in the file [`pandas/tests/indexes/interval/test_astype.py`](https://github.com/thoo/pandas/blob/faf0446b153bb3a403c2442184a5a93070fe6902/pandas/tests/indexes/interval/test_astype.py) !

 - There are no PEP8 issues in the file [`pandas/tests/indexes/interval/test_construction.py`](https://github.com/thoo/pandas/blob/faf0446b153bb3a403c2442184a5a93070fe6902/pandas/tests/indexes/interval/test_construction.py) !

 - There are no PEP8 issues in the file [`pandas/tests/indexes/interval/test_interval.py`](https://github.com/thoo/pandas/blob/faf0446b153bb3a403c2442184a5a93070fe6902/pandas/tests/indexes/interval/test_interval.py) !

 - There are no PEP8 issues in the file [`pandas/tests/indexes/interval/test_interval_new.py`](https://github.com/thoo/pandas/blob/faf0446b153bb3a403c2442184a5a93070fe6902/pandas/tests/indexes/interval/test_interval_new.py) !

 - There are no PEP8 issues in the file [`pandas/tests/indexes/interval/test_interval_range.py`](https://github.com/thoo/pandas/blob/faf0446b153bb3a403c2442184a5a93070fe6902/pandas/tests/indexes/interval/test_interval_range.py) !

 - There are no PEP8 issues in the file [`pandas/tests/indexes/interval/test_interval_tree.py`](https://github.com/thoo/pandas/blob/faf0446b153bb3a403c2442184a5a93070fe6902/pandas/tests/indexes/interval/test_interval_tree.py) !

 - There are no PEP8 issues in the file [`pandas/tests/indexes/multi/conftest.py`](https://github.com/thoo/pandas/blob/faf0446b153bb3a403c2442184a5a93070fe6902/pandas/tests/indexes/multi/conftest.py) !

 - There are no PEP8 issues in the file [`pandas/tests/indexes/multi/test_analytics.py`](https://github.com/thoo/pandas/blob/faf0446b153bb3a403c2442184a5a93070fe6902/pandas/tests/indexes/multi/test_analytics.py) !

 - There are no PEP8 issues in the file [`pandas/tests/indexes/multi/test_astype.py`](https://github.com/thoo/pandas/blob/faf0446b153bb3a403c2442184a5a93070fe6902/pandas/tests/indexes/multi/test_astype.py) !

 - There are no PEP8 issues in the file [`pandas/tests/indexes/multi/test_compat.py`](https://github.com/thoo/pandas/blob/faf0446b153bb3a403c2442184a5a93070fe6902/pandas/tests/indexes/multi/test_compat.py) !

 - There are no PEP8 issues in the file [`pandas/tests/indexes/multi/test_constructor.py`](https://github.com/thoo/pandas/blob/faf0446b153bb3a403c2442184a5a93070fe6902/pandas/tests/indexes/multi/test_constructor.py) !

 - There are no PEP8 issues in the file [`pandas/tests/indexes/multi/test_contains.py`](https://github.com/thoo/pandas/blob/faf0446b153bb3a403c2442184a5a93070fe6902/pandas/tests/indexes/multi/test_contains.py) !

 - There are no PEP8 issues in the file [`pandas/tests/indexes/multi/test_conversion.py`](https://github.com/thoo/pandas/blob/faf0446b153bb3a403c2442184a5a93070fe6902/pandas/tests/indexes/multi/test_conversion.py) !

 - There are no PEP8 issues in the file [`pandas/tests/indexes/multi/test_copy.py`](https://github.com/thoo/pandas/blob/faf0446b153bb3a403c2442184a5a93070fe6902/pandas/tests/indexes/multi/test_copy.py) !

 - There are no PEP8 issues in the file [`pandas/tests/indexes/multi/test_drop.py`](https://github.com/thoo/pandas/blob/faf0446b153bb3a403c2442184a5a93070fe6902/pandas/tests/indexes/multi/test_drop.py) !

 - There are no PEP8 issues in the file [`pandas/tests/indexes/multi/test_duplicates.py`](https://github.com/thoo/pandas/blob/faf0446b153bb3a403c2442184a5a93070fe6902/pandas/tests/indexes/multi/test_duplicates.py) !

 - There are no PEP8 issues in the file [`pandas/tests/indexes/multi/test_equivalence.py`](https://github.com/thoo/pandas/blob/faf0446b153bb3a403c2442184a5a93070fe6902/pandas/tests/indexes/multi/test_equivalence.py) !

 - There are no PEP8 issues in the file [`pandas/tests/indexes/multi/test_get_set.py`](https://github.com/thoo/pandas/blob/faf0446b153bb3a403c2442184a5a93070fe6902/pandas/tests/indexes/multi/test_get_set.py) !

 - There are no PEP8 issues in the file [`pandas/tests/indexes/multi/test_indexing.py`](https://github.com/thoo/pandas/blob/faf0446b153bb3a403c2442184a5a93070fe6902/pandas/tests/indexes/multi/test_indexing.py) !

 - There are no PEP8 issues in the file [`pandas/tests/indexes/multi/test_integrity.py`](https://github.com/thoo/pandas/blob/faf0446b153bb3a403c2442184a5a93070fe6902/pandas/tests/indexes/multi/test_integrity.py) !

 - There are no PEP8 issues in the file [`pandas/tests/indexes/multi/test_join.py`](https://github.com/thoo/pandas/blob/faf0446b153bb3a403c2442184a5a93070fe6902/pandas/tests/indexes/multi/test_join.py) !

 - There are no PEP8 issues in the file [`pandas/tests/indexes/multi/test_missing.py`](https://github.com/thoo/pandas/blob/faf0446b153bb3a403c2442184a5a93070fe6902/pandas/tests/indexes/multi/test_missing.py) !

 - There are no PEP8 issues in the file [`pandas/tests/indexes/multi/test_monotonic.py`](https://github.com/thoo/pandas/blob/faf0446b153bb3a403c2442184a5a93070fe6902/pandas/tests/indexes/multi/test_monotonic.py) !

 - There are no PEP8 issues in the file [`pandas/tests/indexes/multi/test_reindex.py`](https://github.com/thoo/pandas/blob/faf0446b153bb3a403c2442184a5a93070fe6902/pandas/tests/indexes/multi/test_reindex.py) !

 - There are no PEP8 issues in the file [`pandas/tests/indexes/multi/test_set_ops.py`](https://github.com/thoo/pandas/blob/faf0446b153bb3a403c2442184a5a93070fe6902/pandas/tests/indexes/multi/test_set_ops.py) !

 - There are no PEP8 issues in the file [`pandas/tests/indexes/multi/test_sorting.py`](https://github.com/thoo/pandas/blob/faf0446b153bb3a403c2442184a5a93070fe6902/pandas/tests/indexes/multi/test_sorting.py) !

 - There are no PEP8 issues in the file [`pandas/tests/indexes/timedeltas/test_arithmetic.py`](https://github.com/thoo/pandas/blob/faf0446b153bb3a403c2442184a5a93070fe6902/pandas/tests/indexes/timedeltas/test_arithmetic.py) !

 - There are no PEP8 issues in the file [`pandas/tests/indexes/timedeltas/test_astype.py`](https://github.com/thoo/pandas/blob/faf0446b153bb3a403c2442184a5a93070fe6902/pandas/tests/indexes/timedeltas/test_astype.py) !

 - There are no PEP8 issues in the file [`pandas/tests/indexes/timedeltas/test_construction.py`](https://github.com/thoo/pandas/blob/faf0446b153bb3a403c2442184a5a93070fe6902/pandas/tests/indexes/timedeltas/test_construction.py) !

 - There are no PEP8 issues in the file [`pandas/tests/indexes/timedeltas/test_indexing.py`](https://github.com/thoo/pandas/blob/faf0446b153bb3a403c2442184a5a93070fe6902/pandas/tests/indexes/timedeltas/test_indexing.py) !

 - There are no PEP8 issues in the file [`pandas/tests/indexes/timedeltas/test_ops.py`](https://github.com/thoo/pandas/blob/faf0446b153bb3a403c2442184a5a93070fe6902/pandas/tests/indexes/timedeltas/test_ops.py) !

 - There are no PEP8 issues in the file [`pandas/tests/indexes/timedeltas/test_partial_slicing.py`](https://github.com/thoo/pandas/blob/faf0446b153bb3a403c2442184a5a93070fe6902/pandas/tests/indexes/timedeltas/test_partial_slicing.py) !

 - There are no PEP8 issues in the file [`pandas/tests/indexes/timedeltas/test_scalar_compat.py`](https://github.com/thoo/pandas/blob/faf0446b153bb3a403c2442184a5a93070fe6902/pandas/tests/indexes/timedeltas/test_scalar_compat.py) !

 - There are no PEP8 issues in the file [`pandas/tests/indexes/timedeltas/test_setops.py`](https://github.com/thoo/pandas/blob/faf0446b153bb3a403c2442184a5a93070fe6902/pandas/tests/indexes/timedeltas/test_setops.py) !

 - There are no PEP8 issues in the file [`pandas/tests/indexes/timedeltas/test_timedelta.py`](https://github.com/thoo/pandas/blob/faf0446b153bb3a403c2442184a5a93070fe6902/pandas/tests/indexes/timedeltas/test_timedelta.py) !

 - There are no PEP8 issues in the file [`pandas/tests/indexes/timedeltas/test_timedelta_range.py`](https://github.com/thoo/pandas/blob/faf0446b153bb3a403c2442184a5a93070fe6902/pandas/tests/indexes/timedeltas/test_timedelta_range.py) !

 - There are no PEP8 issues in the file [`pandas/tests/indexes/timedeltas/test_tools.py`](https://github.com/thoo/pandas/blob/faf0446b153bb3a403c2442184a5a93070fe6902/pandas/tests/indexes/timedeltas/test_tools.py) !

 # [Codecov](https://codecov.io/gh/pandas-dev/pandas/pull/23339?src=pr&el=h1) Report
> Merging [#23339](https://codecov.io/gh/pandas-dev/pandas/pull/23339?src=pr&el=desc) into [master](https://codecov.io/gh/pandas-dev/pandas/commit/1a7165a13299d0e911258191ebfdc685eb81d724?src=pr&el=desc) will **not change** coverage.
> The diff coverage is `n/a`.

[![Impacted file tree graph](https://codecov.io/gh/pandas-dev/pandas/pull/23339/graphs/tree.svg?width=650&token=eZ4WkYLtcO&height=150&src=pr)](https://codecov.io/gh/pandas-dev/pandas/pull/23339?src=pr&el=tree)

```diff
@@           Coverage Diff           @@
##           master   #23339   +/-   ##
=======================================
  Coverage   92.22%   92.22%           
=======================================
  Files         169      169           
  Lines       51261    51261           
=======================================
  Hits        47277    47277           
  Misses       3984     3984
```

| Flag | Coverage Δ | |
|---|---|---|
| #multiple | `90.66% <ø> (ø)` | :arrow_up: |
| #single | `42.23% <ø> (ø)` | :arrow_up: |


------

[Continue to review full report at Codecov](https://codecov.io/gh/pandas-dev/pandas/pull/23339?src=pr&el=continue).
> **Legend** - [Click here to learn more](https://docs.codecov.io/docs/codecov-delta)
> `Δ = absolute <relative> (impact)`, `ø = not affected`, `? = missing data`
> Powered by [Codecov](https://codecov.io/gh/pandas-dev/pandas/pull/23339?src=pr&el=footer). Last update [1a7165a...6c08423](https://codecov.io/gh/pandas-dev/pandas/pull/23339?src=pr&el=lastupdated). Read the [comment docs](https://docs.codecov.io/docs/pull-request-comments).
 thanks!