TST: Fixturize series/test_api.py
This is in reference to issue #22550
Hello @Anjali2019! Thanks for submitting the PR.

 - There are no PEP8 issues in the file [`pandas/tests/series/test_analytics.py`](https://github.com/Anjali2019/pandas/blob/52ebfa0b416df2f1934eb902c98f522ecc899d6b/pandas/tests/series/test_analytics.py) !

 - There are no PEP8 issues in the file [`pandas/tests/series/test_api.py`](https://github.com/Anjali2019/pandas/blob/52ebfa0b416df2f1934eb902c98f522ecc899d6b/pandas/tests/series/test_api.py) !

 - There are no PEP8 issues in the file [`pandas/tests/series/test_validate.py`](https://github.com/Anjali2019/pandas/blob/52ebfa0b416df2f1934eb902c98f522ecc899d6b/pandas/tests/series/test_validate.py) !

 rebase and ping on green closing as stale. if you'd like to continue pls ping.