public async Task SaveAsyncShouldInsertHistory()
{
var history = new RadarTechno.History.History("author", "entity-technology", "id1", "diff4");
await _repository.SaveAsync(history);
var result = await _repository.FindByElementIdAsync("id1", "entity-technology");
Assert.IsAssignableFrom <IEnumerable <RadarTechno.History.History> >(result);
Assert.Equal(4, Enumerable.Count(result));
}