public async Task GivenSignUpAccountHandler_WhenCallHandle_IfMemberNotFound_ShouldRaiseException()
        {
            // assign
            var query = new SignUpAccountCommand
            {
                MemberId = 1
            };

            _memberService.GetMemberById(query.MemberId).Returns(default(Member));

            // act
            var exception = await Should.ThrowAsync <BusinessException>(() => _signUpAccountHandler.Handle(query, CancellationToken.None));

            // assert
            exception.IsBadRequest.ShouldBeTrue();
            exception.BusinessErrorMessage.ShouldContain("Invalid member details.");
            await _accountService.DidNotReceive().SignUpAccount(Arg.Any <Member>());

            await _unitOfWork.DidNotReceive().SaveChangesAsync(CancellationToken.None);
        }