I am trying to unit test a class A, where I call a method in its Constructor getB(). I want to Unit test this class A without calling this method inside the constructor in order to test other methods inside the class.

class A{
   B b;
 public A(){
  B = getB();
  }
  doSomething(){
  b.doOtherThing();
}
getB(){
   return somethingThatReturnB;
}
}

@Test
class TestA{
  @Spy
  A a;

  @Mock
  B b;

@BeforeMethod
public void beforeMethod(){
 MockiyoAnnotations.openMocks(this);
}

@Test
public void testMethod(){
  doReturn(smt).when(b).doOtherThing();
  a.doSomething();
}

}

I tried the mocking constructor but this doesn’t call the real Method I want to test.