Nested mock functions in Jest

I'm currently trying to test out mocking some of my jest functions. One of the issues I'm having is trying to mock out a function that is called inside of another function. Here is a high level example of what I'm trying to do:

//Apple.js
function Apple(){
   return Orange(1, 2);
}

function Orange(arg1, arg2){
   return (arg1 + arg2);
}

I want to test the Apple function without making an actual call to Orange. What would be the code to mock out my orange function in a .spec.js file to make something like this happen? I was thinking something like the following but I doubt it:

//Apple.spec.js
import Apple from "Apple.js";
it("Should run Apple", () => {
   global.Orange = jest.fn().mockImplementation(() => {return 3});
   expect(Apple()).toEqual(3);
});

It's a really simple example but knowing this would definitely help me understand the next step in my project. I hope to hear from the community soon!