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);
}