Two level grouped row test for collapse
Two level grouped row test for collapse

Gaurav0/ember-table,nomadop/ember-table,hedgeserv/ember-table,Cuiyansong/ember-table,phoebusliang/ember-table,nomadop/ember-table,Gaurav0/ember-table,Cuiyansong/ember-table,hedgeserv/ember-table,phoebusliang/ember-table