public async void TagsController_Edit()
{
var ctrlr = new TagsController(_dbContext);
Tag tag = _dbContext.Tag.SingleOrDefault(d => d.TagId == 1);
tag.TagName = "more stuff";
var result = await ctrlr.Edit(tag.TagId, tag);
var resultView = Assert.IsType <RedirectToActionResult>(result);
Assert.Equal(1, _dbContext.Tag.Count(d => d.TagName == "more stuff"));
}