added test for dw.dataset
added test for dw.dataset

ThuyNTran/datawrapper,motherjones/datawrapper,grepman/datawrapper,rubensfernando/datawrapper,motherjones/datawrapper,ThuyNTran/datawrapper,elaOnMars/datawrapper,kendrick-k/datawrapper,grepman/datawrapper,grepman/datawrapper,rubensfernando/datawrapper,plusgut/datawrapper,datafunk/datawrapper,robmcloughlin/Insights,washingtonpost/datawrapper,qqming113/datawrapper,elaOnMars/datawrapper,devinit/datawrapper,devinit/datawrapper,kendrick-k/datawrapper,grepman/datawrapper,washingtonpost/datawrapper,motherjones/datawrapper,plusgut/datawrapper,elaOnMars/datawrapper,qqming113/datawrapper,rubensfernando/datawrapper,ThuyNTran/datawrapper,datafunk/datawrapper,robmcloughlin/Insights,rubensfernando/datawrapper,elaOnMars/datawrapper,devinit/datawrapper,washingtonpost/datawrapper,plusgut/datawrapper,qqming113/datawrapper,qqming113/datawrapper,devinit/datawrapper,washingtonpost/datawrapper,robmcloughlin/Insights,washingtonpost/datawrapper,qqming113/datawrapper,devinit/datawrapper,qqming113/datawrapper,kendrick-k/datawrapper,grepman/datawrapper,plusgut/datawrapper,kendrick-k/datawrapper,ThuyNTran/datawrapper,grepman/datawrapper,ThuyNTran/datawrapper,motherjones/datawrapper,datafunk/datawrapper,elaOnMars/datawrapper,kendrick-k/datawrapper,ThuyNTran/datawrapper,devinit/datawrapper,robmcloughlin/Insights,datafunk/datawrapper,motherjones/datawrapper,elaOnMars/datawrapper,rubensfernando/datawrapper,kendrick-k/datawrapper,motherjones/datawrapper,datafunk/datawrapper,robmcloughlin/Insights,washingtonpost/datawrapper,datafunk/datawrapper