Google Mock unit testing static methods c++

Question

I just started working on unit testing (using BOOST framework for testing, but for mocks I have to use Google Mock) and I have this situation :

class A
{
static int Method1(int a, int b){return a+b;}
};

class B
{
static int Method2(int a, int b){ return A::Method1(a,b);}
};

So, I need to create mock class A, and to make my class B not to use real Method1 from A class, but to use mock.

I'm not sure how to do this, and I could not find some similar example.