TST: Add tests for fixed issues
- [x] closes #5647
- [x] closes #5586
- [x] closes #5286
- [x] tests added / passed
- [x] passes `black pandas`
- [x] passes `git diff upstream/master -u -- "*.py" | flake8 --diff`

Hello @mroeschke! 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 2019-12-24 22:18:54 UTC looks like a int32 vs int64 issue? @jbrockmendel looks like that was the issue. All green the other 3 LGTM thanks @mroeschke 