public async Task UpdateMailingAsync_UpdatesDataBase() { //arrange var worksId = new List <int>(); worksId.Add(5); var oldWorkCount = _mailingsDb[1].Works.Count; var oldTextCount = _mailingsDb[1].MailText.Count; var model = new UpdateMailingModel() { MailingId = 1, StartDate = "10.01", WorksId = worksId }; //act await _service.UpdateAsync(model); // assert Assert.AreEqual("10.01", _mailingsDb[1].StartDate); Assert.IsTrue(_mailingsDb[1].Works.Count > oldWorkCount); Assert.IsTrue(_mailingsDb[1].MailText.Count > oldTextCount); }