### Question:
Game2048BoardManager implements Serializable { boolean isGameOver() { boolean flag = true; if (hasEmpty()) { flag = false; } for (int i = 0; i < complexity; i++) { for (int j = 0; j < complexity; j++) { Game2048Item item = game2048Items[i][j]; if ((j + 1) != complexity) { Game2048Item itemRight = game2048Items[i][j + 1]; if (item.getNumber() == itemRight.getNumber()) flag = false; } if ((i + 1) != complexity) { Game2048Item itemBottom = game2048Items[i + 1][j]; if (item.getNumber() == itemBottom.getNumber()) flag = false; } if (j != 0) { Game2048Item itemLeft = game2048Items[i][j - 1]; if (itemLeft.getNumber() == item.getNumber()) flag = false; } if (i != 0) { Game2048Item itemTop = game2048Items[i - 1][j]; if (item.getNumber() == itemTop.getNumber()) flag = false; } } } return flag; } Game2048BoardManager(User user, int complexity, Context context); User getUser(); void undo(Context context);  }### Answer:
@Test public void testIsGameOver() { initializeBoard(); fillBoardWithZero(); assertFalse(boardManager.isGameOver()); fillBoardWithAllNumber(); assertFalse(boardManager.isGameOver()); }