add failing test for invalid Date object
add failing test for invalid Date object

ck-lee/joi,myndzi/joi,jagoda/joi,naitsric/joi,geminiyellow/joi,opyate/joi,tpiecora/joi,cesarmarinhorj/joi,danielb2/joi,myndzi/joi,davidbenko9/joi,olistic/joi-extended,bananaoomarang/joi,thethanghn/react-native-joi,pikselpalette/joi,pandeysoni/joi,jeffbski/joi,lloydbenson/joi,rmoorman/joi,robertherber/joi-extended