### Question:
SlidingTilesMovementController { void decreaseUndoLimitCurrent() { undoLimitCurrent--; } SlidingTilesMovementController();   }### Answer:
@Test public void testDecreaseUndoLimitCurrent() { SlidingTilesMovementController mController = new SlidingTilesMovementController(); mController.setUndoLimit(3); mController.decreaseUndoLimitCurrent(); assertEquals(2, mController.getUndoLimitCurrent()); }