Check matching df indexes

Hello!

Is there any way to check that two data frames have the same index using `engarde`? In other words, suppose I have two data frames that are indexed by date times. Is there any way to assert that the indexes are the same, and if they are not, to get a "diff" of the dates? I can't seem to find anything on `checks.py` but perhaps there's a nice trick that I'm missing.

Thanks!
George