Jest/Typescript: Mock class dependencies in Jest and Typescript

I have class B which is dependent on class A. I want to test a method of class B which is internally calling a method of class A. Now, I want to unit test my method of class B by mocking class A.

My code structure:

class A {
  getSomething() {
     return "Something";
  }
}


class B {
  constructor(objectOfClassA: A) {
      this._objectOfClassA = objectOfClassA;

 }

 functionofClassBToTest() {
     const returnValueFromClassA = this.__objectOfClassA.getSomething();

     return returnValueFromClassA;
 }
}

What I have tried so far:

import ....
import { mocked } from 'jest-mock';

jest.mock("./A", () => {
    return {
        A: jest.fn().mockImplementation(() => {
            return {
                getSomething: getSomethingMock
            }
        })
    };
});

const getSomethingMock = jest.fn().mockImplementation(() => {
    return "Mock value";
});

const mockA = mocked(A, true);

test("test functionofClassBToTest", () => {
    const classBToTest = new B(mockA);

    expect(classBToTest.functionofClassBToTest.toStrictEqual("Mock value");
});

This is the error that I am getting:

TypeError: this._objectOfClassA.getSomething is not a function

Note: I don’t want to initialize an object of class A inside my test function. I only want to mock the class.

I also found some previous posts on SO : Post1 and Post2 but nothing worked.