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);
}