Mock a non-virtual method in another non-virtual method in Cpp with Gmock

Question

I am running into a problem about mocking a non-virtual method that need your help. I referred to the link: Mock non-virtual method giving compilation error

I understood what they did. But I have an advanced question. Assume that I have:

 */
#include <iostream>
#include <gtest/gtest.h>
#include <gmock/gmock.h>

using ::testing::Invoke;
using ::testing::NiceMock;

template <class myclass> class Templatemyclass {
 public:
  myclass T;
  void show() ;
};

template <class myclass> void Templatemyclass<myclass>::show()
{
    T.show_text();
}

struct Test {

  void display()  { std::cout << __func__<<":-->Inside the display Test\n"; }

  void show_text()  {
      display(); // HOW to re-route it to my_display() ? (>.<)
  }
};

struct MockTest {
  MOCK_CONST_METHOD0(display, void());
  MOCK_CONST_METHOD0(show_text, void());
};

void my_display(){
    { std::cout <<__func__<<":-->Outside the display Test\n"; }
}

int main() {
  //NiceMock<Templatemyclass<Test> > obj1;
  //obj1.show();

  NiceMock<Templatemyclass<MockTest> > obj2;
  EXPECT_CALL(obj2.T, display())
      .Times(1)
      .WillOnce(Invoke(my_display));
  obj2.show();

  return 0;
}

I'd like that when show_text is called, it's going to call display . I try to mock display and re-route it to my_display , but that's failed. I got the error.

../test_program.cpp:56: Failure
Actual function call count doesn't match EXPECT_CALL(obj2.T, display())...
         Expected: to be called once
           Actual: never called - unsatisfied and active

Changing the above source code a bit. It can work, but this missed my expectation. I'd like to mock display that called in show_text .

template <class myclass> class Templatemyclass {
 public:
  myclass T;
  void show() ;
};

template <class myclass> void Templatemyclass<myclass>::show()
{
    T.display();
}

struct Test {

  void display()  { std::cout << __func__<<":-->Inside the display Test\n"; }

//  void show_text()  {
//    display(); // HOW to re-route it to my_display() ? (>.<)
//  }
};

struct MockTest {
  MOCK_CONST_METHOD0(display, void());
  MOCK_CONST_METHOD0(show_text, void());
};

void my_display(){
    { std::cout <<__func__<<":-->Outside the display Test\n"; }
}

int main() {
  NiceMock<Templatemyclass<Test> > obj1;
  obj1.show();

  NiceMock<Templatemyclass<MockTest> > obj2;
  EXPECT_CALL(obj2.T, display())
      .Times(1)
      .WillOnce(Invoke(my_display));
  obj2.show();

  return 0;
}

And the screen shows:

display:-->Inside the display Test
my_display:-->Outside the display Test

Please help me clear this problem.

Answer 1

You can't use EXPECT_CALL out of a TEST or TEST_F macro. Your main function should invoke the runner and you should place the code you now have in main within a TEST . Check the docs .