gtest EXPECT_CALL does not working when expected call is nested

Look at such code snippet:

class Foo {
 public:
  Foo() {
  }

  void invoke_init(const int i) {
    init(i);
  }

 private:
  void init(const int i) {
    std::cout << "init " << i << std::endl;
  }
};
    
class MockedFoo : public Foo {
 public:
  MOCK_METHOD(void, init, (const int));
};

TEST(Foo, TestInitCalled) {
  MockedFoo mock;
  mock.invoke_init(1);
  EXPECT_CALL(mock, init(1));
}

As expected, init() is called and i see corresponding output. But the test is failed. Why? What is wrong there?

Foo::init needs to be protected instead of private. It also needs to be virtual.

Without protected as its visibility attribute, it can't really be overridden in the inherited class. Without virtual, gmock can't do much with it either.

Instead of this:

 private:
  void init(const int i) {
    std::cout << "init " << i << std::endl;
  }

This:

 protected:
  virtual void init(const int i) {
    std::cout << "init " << i << std::endl;
  }