### Question:
SlidingTilesMovementController { void increaseUndoLimitCurrent() { if (undoLimitCurrent < undoLimitPlayerSet) { undoLimitCurrent++; } } SlidingTilesMovementController();   }### Answer:
@Test public void testIncreaseUndoLimitCurrent() { SlidingTilesMovementController mController = new SlidingTilesMovementController(); mController.setUndoLimit(3); mController.setUndoLimitCurrent(2); mController.increaseUndoLimitCurrent(); assertEquals(3, mController.getUndoLimitCurrent()); }