REF/TST: collect astype tests
- [ ] closes #xxxx
- [ ] tests added / passed
- [ ] passes `black pandas`
- [ ] passes `git diff upstream/master -u -- "*.py" | flake8 --diff`
- [ ] whatsnew entry

hmm

i think this one is actually failing some CI (that IS related)

e.g. CI/web and docs is failing can you rebase rebased+green