title: How to unit test methods that are void and do not take any parameters?
body: <p>Methods like selectBoardSize (int x, int y). Returns a new board size.</p>
  
  <p>This method has values and has parameters that can be unit-tested and compared in a project.</p>
  
  <p>What about methods that are void? Like void playSound. This method only plays the sound of the game. Does not take any values and does not return anything. How should we write a unit test for methods like these?</p>