Added unittesting for #884317
Added unittesting for #884317

adamgreig/python-dateutil,pganssle/dateutil-test-codecov,sprymix/dateutil,sprymix/python-dateutil,jenshnielsen/dateutil,mjschultz/dateutil,emsoftware/python-dateutil,pganssle/dateutil-test-codecov,abalkin/dateutil,abalkin/dateutil,Bachmann1234/dateutil