TST: Test resampling with NaT
TST: Test resampling with NaT

closes #13020

Author: Alex Alekseyev <alex.alekseyev@twosigma.com>

Closes #13164 from evectant/issue-13020 and squashes the following commits:

c7e6f5f [Alex Alekseyev] TST: Test resampling with NaT

louispotok/pandas,jorisvandenbossche/pandas,MJuddBooth/pandas,gfyoung/pandas,cbertinato/pandas,linebp/pandas,DGrady/pandas,rs2/pandas,jorisvandenbossche/pandas,Winand/pandas,gfyoung/pandas,TomAugspurger/pandas,amolkahat/pandas,MJuddBooth/pandas,jreback/pandas,amolkahat/pandas,nmartensen/pandas,GuessWhoSamFoo/pandas,toobaz/pandas,DGrady/pandas,Winand/pandas,nmartensen/pandas,gfyoung/pandas,GuessWhoSamFoo/pandas,MJuddBooth/pandas,datapythonista/pandas,winklerand/pandas,Winand/pandas,datapythonista/pandas,GuessWhoSamFoo/pandas,jorisvandenbossche/pandas,TomAugspurger/pandas,zfrenchee/pandas,winklerand/pandas,jmmease/pandas,kdebrab/pandas,linebp/pandas,zfrenchee/pandas,harisbal/pandas,jorisvandenbossche/pandas,toobaz/pandas,MJuddBooth/pandas,louispotok/pandas,linebp/pandas,dsm054/pandas,jreback/pandas,jmmease/pandas,harisbal/pandas,louispotok/pandas,zfrenchee/pandas,pandas-dev/pandas,jreback/pandas,jmmease/pandas,jreback/pandas,toobaz/pandas,dsm054/pandas,winklerand/pandas,toobaz/pandas,cbertinato/pandas,kdebrab/pandas,gfyoung/pandas,toobaz/pandas,jmmease/pandas,harisbal/pandas,rs2/pandas,winklerand/pandas,pratapvardhan/pandas,pandas-dev/pandas,pratapvardhan/pandas,MJuddBooth/pandas,cython-testbed/pandas,dsm054/pandas,rs2/pandas,dsm054/pandas,cython-testbed/pandas,pandas-dev/pandas,cbertinato/pandas,louispotok/pandas,DGrady/pandas,jreback/pandas,linebp/pandas,gfyoung/pandas,DGrady/pandas,harisbal/pandas,cython-testbed/pandas,DGrady/pandas,amolkahat/pandas,cbertinato/pandas,amolkahat/pandas,TomAugspurger/pandas,cbertinato/pandas,zfrenchee/pandas,nmartensen/pandas,pratapvardhan/pandas,DGrady/pandas,nmartensen/pandas,louispotok/pandas,kdebrab/pandas,GuessWhoSamFoo/pandas,amolkahat/pandas,Winand/pandas,nmartensen/pandas,jmmease/pandas,kdebrab/pandas,cython-testbed/pandas,datapythonista/pandas,harisbal/pandas,winklerand/pandas,nmartensen/pandas,zfrenchee/pandas,rs2/pandas,jmmease/pandas,kdebrab/pandas,linebp/pandas,TomAugspurger/pandas,Winand/pandas,pandas-dev/pandas,winklerand/pandas,pratapvardhan/pandas,linebp/pandas,datapythonista/pandas,cython-testbed/pandas,pratapvardhan/pandas,GuessWhoSamFoo/pandas,dsm054/pandas,Winand/pandas