TST:  Adding tests for checking Boolean series and df as indexes for series
- [ ] closes #18579
- [ ] tests added / passed
- [ ] Ensure all linting tests pass, see [here](https://pandas.pydata.org/pandas-docs/dev/development/contributing_codebase.html#pre-commit) for how to run them
- [ ] After discussion in #18579 the current tests were suggested

thanks @bdrum 