@Test
public void testEmpty() {
assertTrue(board.empty(0, 0));
board.put(0, 0, new Token('x'));
assertFalse(board.empty(0, 0));
board.put(0, 0, new Token('_'));
assertTrue(board.empty(0, 0));
}
@Test
public void testBoard() {
for (int i = 0; i < 3; i++) {
for (int j = 0; j < 3; j++) {
board.empty(i, j);
}
}
}