, -1);

					flush(function() {
						//should have a down arrow
						var des = grid.$.viewport.$.header.querySelector('strand-icon.des');
						should.exist(des);
						grid.sortBy('bar', 1);

						flush(function() {
							//should have an up arrow with a parent of foo
							var asc = grid.$.viewport.$.header.querySelector('strand-icon.asc');
							var des = grid.$.viewport.$.header.querySelector('strand-icon.des');
							should.exist(asc);
							should.exist(des);
							des.style.display.should.eq