@Test public void testDigCount() throws InvalidActionException { Cell cell = new Cell(false, 0); Cell[][] cells = new Cell[SIZE][SIZE]; for (int i = 0; i < SIZE; i++) for (int j = 0; j < SIZE; j++) cells[i][j] = new Cell(false, 0); cells[0][0] = cell; Cells cellsObject = new Cells(cells); Board board = new Board(cellsObject); cell.dig(); Assert.assertEquals(board.numberOfDigCell(), 1); }