public async Task When2UsersVotesForSameArticleTheAverageShoultBeCorrect()
{
var list = new List <Vote>();
var mockRepo = new Mock <IRepository <Vote> >();
mockRepo.Setup(x => x.All()).Returns(list.AsQueryable());
mockRepo.Setup(x => x.AddAsync(It.IsAny <Vote>())).Callback((Vote vote) => list.Add(vote));
var service = new VotesService(mockRepo.Object);
await service.VoteAsync(2, "Gosho", 5);
await service.VoteAsync(2, "Tosho", 1);
await service.VoteAsync(2, "Gosho", 2);
mockRepo.Verify(x => x.AddAsync(It.IsAny <Vote>()), Times.Exactly(2));
Assert.Equal(2, list.Count);
Assert.Equal(1.5, service.GetAverageStarsFromVotes(2));
}