public async Task Send_Emails_Calls_Handler()
{
var result = await _controller.SendEmails(_request);
_mediator.Verify(x =>
x.Send(It.Is <SendEmailsCommand>(c => c.EmailDataList.Count == _request.EmailDataList.Count && c.EmailDataList[0].RecipientEmailAddress == _request.EmailDataList[0].RecipientEmailAddress),
It.IsAny <CancellationToken>()));
}