assert_select "changes[starttime='#{hourago.xmlschema}'][endtime='#{now.xmlschema}']", :count => 1 do
assert_select "tile", :count => 0
end
assert_select "changes[starttime='#{hourago.xmlschema}'][endtime='#{now.xmlschema}']", :count => 1 do
assert_select "tile", :count => 0
end