package mock import ( "context" "google.golang.org/grpc/codes" "google.golang.org/grpc/status" ) type DepositServer struct { } func (*DepositServer) Deposit(ctx context.Context, req *DepositRequest) (*DepositResponse, error) { if req.GetAmount() < 0 { return nil, status.Errorf(codes.InvalidArgument, "cannot deposit %v", req.GetAmount()) } return &DepositResponse{Ok: true}, nil }