I have the following code which is getting the current counter value from DB. Then it updates the counter in DB and then again it retrieves the value.
Mockito supports changing the returned value; this support extends to PowerMockito. Just use OngoingStubbing.thenReturn(T value, T... values)
OngoingStubbing<T> thenReturn(T value, T... values)
Sets consecutive return values to be returned when the method is called.
when(mock.someMethod()).thenReturn(1, 2, 3);
Last return value in the sequence (in example: 3) determines the behavior of further consecutive calls.
So, in this case, you would do:
Note: this answer assumes you already know how to mock
static methods. If you do not, see this question.