Mock class instantiated in constructor of other class in Gtest

Question

class B;

class A
{
public:
    A() { b = std::make_shared<B>(this); }
    void method() { b->methodB(); }
private:
    std::shared_ptr<B> b;
};

class B
{
public: 
    ...
    void methodB() {}
};

I want to test if methodB is called from method. How to mock class B in order to make this possible?

Can you elaborate how `b = std::make_shared(this);` should actually work without `A` being a derived class of `B` and `b` not being a `std::shared_ptr`?? Your code example doesn't make any sense for me, sorry. — πάντα ῥεῖ, Apr 18 '22 at 13:53
@πάνταῥεῖ typo, sorry. I edited question right now :) — SKorovjov, Apr 18 '22 at 13:59
`B b;` still isn't a `shared_ptr` and your code still doesn't make any sense. Maybe you abstracted the real problem a bit too far here. — πάντα ῥεῖ, Apr 18 '22 at 14:12
Yeah, I didn't see that, because I have written this to be correct, just to show what I need. So basically one typo more. But my question isn't about that. It's about gtest mocks. — SKorovjov, Apr 18 '22 at 14:15
Does that make sense in 1st place: https://stackoverflow.com/questions/625799/resolve-build-errors-due-to-circular-dependency-amongst-classes ? Because your code won't compile, no regards using a mock or not. — πάντα ῥεῖ, Apr 18 '22 at 14:16
No, because code from project doesn't have any errors, it works, and now I want to cover it with GTests, because of future changes. — SKorovjov, Apr 18 '22 at 14:20
In other words: Get `A() { b = std::make_shared(this); }` compiled 1st, before asking about gtest mocking. Post a [mcve]. — πάντα ῥεῖ, Apr 18 '22 at 14:20
If you can change `A`, you could have its constructor(s) accept a `BFactory` instead of creating its own `B` object. — aschepler, Apr 18 '22 at 14:43
I do not see polymorphism in the sample. The problem is that mocking relies on dynamic polymorphism and any code that doesn't follow that rule will be hard (and ugly) to mock. — 273K, Apr 18 '22 at 21:58

Mock class instantiated in constructor of other class in Gtest

0 Answers0