'Junit: how to handle class level variables in junit test cases

In the below incrementId() method, I need to test id > MAX_NUM greater than the condition.

pubic class ClassATest {

  AtomicInteger atomicInt = new AtomicInteger (0)
  public static final int MAX_NUM = 1000

  pulic long incrementId() {
   long id = atomicInt.incrementAndGet();
   if (id > MAX_NUM ) {
     System.out.println("need to be tested....")
   }
}
}

Is it possible to mock the above atomicInt object? or is there any way to test above if condition without affecting the performance?

Can someone please help me on this?

javajunitmockito


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