Mock non-virtual method giving compilation error

Question

I need to write the gtest to test some existing code that has a non-virtual method, hence I am testing using the below source, but I am getting the compilation error

Answer 1

There are a couple of issues in your code. I have changed it below and commented the code by way of explanation. If this is not clear enough, add a comment and I'll try and explain further.

#include 
#include 
#include 

using namespace std;

template 
class Templatemyclass {
 private:
  // Hold a non-const ref or pointer to 'myclass' so that the actual
  // object passed in the c'tor is used in 'display()'.  If a copy is
  // used instead, the mock expectations will not be met.
  myclass* T;
 public :
  // Pass 'myclass' in the c'tor by non-const ref or pointer.
  explicit Templatemyclass(myclass* t) : T(t) {}
  void display() { T->display(); }
};

class Test {
 public:
  void display() { cout << "Inside the display Test:" << endl; }
};

class MockTest {
 public:
  MOCK_METHOD0(display, void());
};

class FinalTest {
 public:
  // Templatise this function so we can pass either a Templatemyclass
  // or a Templatemyclass.  Pass using non-const ref or pointer
  // again so that the actual instance with the mock expectations set on it
  // will be used, and not a copy of that object.
  template
  void show(T& t) {
    t.display();
    cout<<"Inside the display FinalTest:" < obj1(&test);

  MockTest mock_test;
  Templatemyclass obj2(&mock_test);
  EXPECT_CALL(mock_test,display()).Times(1);

  FinalTest test1;
  test1.show(obj1);
  test1.show(obj2);

  return 0;
}

The following could possibly simplify the case:

#include 
#include 
#include 

template 
class Templatemyclass {
 public:
  myclass T;
  void show() const { T.display(); }
};

struct Test {
  void display() const { std::cout << "Inside the display Test:\n"; }
};

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

int main() {
  Templatemyclass obj1;
  obj1.show();

  Templatemyclass obj2;
  EXPECT_CALL(obj2.T, display()).Times(1);
  obj2.show();

  return 0;
}