public async Task Post_DebitApplicationRequest_Debits_Application()
        {
            await _controller.DebitApplication(_request);

            _mediator.Verify(x =>
                             x.Send(It.Is <DebitApplicationCommand>(c => c.ApplicationId == _request.ApplicationId && c.Amount == _request.Amount && c.NumberOfApprentices == _request.NumberOfApprentices),
                                    It.IsAny <CancellationToken>()));
        }