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>())); }