TST: Test Loc to set Multiple Items to multiple new columns
- [x] closes #25594
- [x] tests added / passed
- [x] Ensure all linting tests pass, see [here](https://pandas.pydata.org/pandas-docs/dev/development/contributing.html#code-standards) for how to run them
- [x] whatsnew entry
added test to pandas/tests/indexing/multi/test_loc.py
Hello @GYvan! Thanks for updating this PR. We checked the lines you've touched for [PEP 8](https://www.python.org/dev/peps/pep-0008) issues, and found:



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

##### Comment last updated at 2021-07-27 15:01:12 UTC Thanks @GYvan for the PR. There are some lint failures and another git commit.

see https://pandas.pydata.org/pandas-docs/dev/development/contributing.html#working-with-the-code  > Thanks @GYvan for the PR. There are some lint failures and another git commit.
> 
> see https://pandas.pydata.org/pandas-docs/dev/development/contributing.html#working-with-the-code

Thanks, I will look through them > Thanks @GYvan for the PR. There are some lint failures and another git commit.
> 
> see https://pandas.pydata.org/pandas-docs/dev/development/contributing.html#working-with-the-code

 > > Thanks @GYvan for the PR. There are some lint failures and another git commit.
> > see https://pandas.pydata.org/pandas-docs/dev/development/contributing.html#working-with-the-code



> Thanks @GYvan for the PR. There are some lint failures and another git commit.
> 
> see https://pandas.pydata.org/pandas-docs/dev/development/contributing.html#working-with-the-code

 Hi @simonjayhawkins. I have tried to address the lint failures and reverted the unrelate changes. Can you please let me know if anything else needs changes?
 cc @phofl lgtm. @phofl merge when ready Thanks @GYvan 