public void BatchUntaggingTest()
{
var tags = _userTagService.Get();
var tag = tags.FirstOrDefault();
_userTagService.BatchTagging(tag.Id, new string[] { OpenId });
var tt = _userTagService.Get(tag.Id);
Assert.True(tt.Data.OpenIds.Contains(OpenId));
_userTagService.BatchUntagging(tag.Id, new string[] { OpenId });
tt = _userTagService.Get(tag.Id);
Assert.False(tt.Data.OpenIds.Contains(OpenId));
}