HippoMocks mocking return values by ref

Question

class IEmployeeServiceProxy
{
public:
    virtual ~IEmployeeServiceProxy() { }
    virtual void AddEmployee(const Employee&) = 0;
    virtual int GetEmployees(std::vector<Employee>&) = 0;
};

struct Employee
{
    boost::uuids::uuid Id;
    std::string Name;
};

m_Mocks.ExpectCall(m_EmpSvcMock.get(), IEmployeeServiceProxy::GetEmployees).Return???;

How do I mock it so that it'll return a std::vector via the argument instead of int (which is the return type of the method)?

Also, what if there is more than 1 ref argument?

Answer 1

you have to provide the object for the reference yourself, make sure the mock uses it using With and you can alter it passing a function to Do, which also provides the return value. It does not matter how many reference arguments there are. Example:

int AddSomeEmployees( std::vector< Employee >& v )
{
  v.push_back( Employee() );
  return 0;
}

  //test code
std::vector< int > arg;

mocks.ExpectCall( empSvcMock, IEmployeeServiceProxy::GetEmployees ).With( arg ).Do( AddSomeEmployees );

Note that Do can take any kind of function, also std::function, lambdas etc.

Answer 2

The Git version (most recent one) has an option for Out parameters which are pretty much this. To use

std::vector<int> args; args.push_back(1); args.push_back(2);
mocks.ExpectCall(mock, IInterface::function).With(Out(arg));