public async void ShouldChangeMailStatusAfterSending()
        {
            List <Mail> initialMails = new List <Mail>
            {
                new Mail
                {
                    Sender     = "*****@*****.**",
                    Content    = "test",
                    Priority   = Priority.Important,
                    Status     = Status.Pending,
                    Recipients = new List <Recipient>
                    {
                        new Recipient
                        {
                            RecipientMail = "*****@*****.**"
                        }
                    }
                },
                new Mail
                {
                    Sender     = "*****@*****.**",
                    Content    = "test",
                    Priority   = Priority.Important,
                    Status     = Status.Pending,
                    Recipients = new List <Recipient>
                    {
                        new Recipient
                        {
                            RecipientMail = "*****@*****.**"
                        }
                    }
                }
            };
            int userId = 1;

            _mailRepositoryMock.Setup(x => x.GetPendingMailsByUserIdAsync(It.IsAny <int>()))
            .ReturnsAsync(() => initialMails);
            _mailRepositoryMock.Setup(x => x.GetAllMailsByUserIdAsync(It.IsAny <int>()))
            .ReturnsAsync(() => initialMails);

            await _mailSrv.SendMailAsync(userId);

            var mails = await _mailSrv.GatAllMailsByUserIdAsync(userId);

            Assert.True(mails.All((x) => x.Status == Status.Sent));
        }
        public async Task <IActionResult> Post(int id)
        {
            await _mailSrv.SendMailAsync(id);

            return(Ok());
        }