public async Task EssayGradedWithoutGrade()
{
var context = EssayCompetitionContextInMemoryFactory.InitializeContext();
var essay = await this.seeder.SeedEssayAsync(context);
var gradeRepository = new EfRepository <Grade>(context);
var service = new GradeService(gradeRepository);
var result = service.EssayGradet(essay.Id);
Assert.True(result == false, "EssayGraded method does not work correctly");
}