public void testDiffClearingHasNoEffectWhileDisabled() {
   startWithStateAndDiff();
   document.startDiffRetention();
   document.clearDiffs();
   document.stopDiffRetention();
   assertFalse(state.isCompleteDiff());
   assertFalse(state.isCompleteState());
   assertTrue(OpComparators.equalDocuments(state.asOperation(), Y));
 }
 public void testDiffClearingWorksWhenEnabled() {
   startWithStateAndDiff();
   document.clearDiffs();
   assertTrue(state.isCompleteState());
   assertTrue(OpComparators.equalDocuments(state.asOperation(), Y));
 }