How to mock another method in the same class which is being tested?

I am writing JUnit Test case for a class which has two methods methodA,methodB. I would like to mock the call to the methodB from methodA in my test case I am using spy on the class which I am testing, but still the methodB gets executed. here is the class ``` public class SomeClass { public Object methodA(Object object) { object=methodB(object); return object; } public Object methodB(Object object) { //do somthing return object; } } ``` here is the test class ``` @RunWith( org.powermock.modules.junit4.legacy.PowerMockRunner.class ) @PrepareForTest(SomeClass.class) public class SomeClassTest { private SomeClass var = null; @Before public void setUp() { var=new SomeClass(); } @After public void tearDown() { var= null; } @Test public void testMethodA_1() throws Exception { Object object =new Object(); SomeClass spy_var=PowerMockito.spy(var); PowerMockito.when(spy_var.methodB(object)).thenReturn(object); Object result = var.methodA(object); assertNotNull(result); } } ``` The method B still gets the called though I have mocked it PLease suggest me a solution with the proper way of mocking the methodB call from methodA of the same class.