add unit test to ensure adding/removing/adding records will properly affect DataList
add unit test to ensure adding/removing/adding records will properly affect DataList

Enyo-DCO-1.1-Signed-off-by: Cole Davis <cole.davis@lge.com>

kustomzone/enyo,soapdog/enyo,bright-sparks/enyo,enyojs/enyo,kustomzone/enyo,bright-sparks/enyo,enyojs/enyo,wikieswan/enyo,beni55/enyo,beni55/enyo,PKRoma/enyo,zefsolutions/enyo,soapdog/enyo,zefsolutions/enyo,mcanthony/enyo,mcanthony/enyo,wikieswan/enyo,PKRoma/enyo