public void PutTags(int id)
{
var updateEntity = _fixture.Build <TagModel>().With(x => x.Id, id).Create();
// Act
var controller = new TagsController(_logger, _entityBL, _commonBL);
var result = controller.PutTags(id, updateEntity) as OkNegotiatedContentResult <JsonResponse>;
// Assert
var resultEntity = result.Content.Data as Tag;
Assert.That(resultEntity.LastActivityDate, Is.Not.EqualTo(DateTime.MinValue));
Assert.That(resultEntity.Id, Is.EqualTo(1)); // hasn't changed
}