public async Task CountTest()
{
var context = EssayCompetitionContextInMemoryFactory.InitializeContext();
await this.SeedData(context);
var contestRepository = new EfDeletableEntityRepository <Contest>(context);
var essayRepository = new EfDeletableEntityRepository <Essay>(context);
var essayTeacherRepository = new EfDeletableEntityRepository <EssayTeacher>(context);
var contestantContestRepository = new EfDeletableEntityRepository <ContestantContest>(context);
var service = new ContestService(contestRepository, essayRepository, essayTeacherRepository, contestantContestRepository);
var countBefore = service.GetContestsCount();
await service.AddContestAsync(DateTime.Now, DateTime.Now, "Legion2", "Legion", context.Categories.First().Id);
var countAfter = service.GetContestsCount();
Assert.True(countAfter == countBefore + 1, "Count method does not work correctly");
}