public void TestModifyRegion_EmptyInput(string city, string district)
{
viewModel.CityName = city;
viewModel.DistrictName = district;
viewModel.RegionName = "";
controller.ModifyRegion(viewModel);
Assert.AreEqual(controller.TempData["error"],
"保存区域:" + city + "-" + district + "-<Empty>失败。"
+ "输入条件部分为空，或者该片区已存在，或该片区与已存在的片区有冲突，且设置不允许修改！");
}
