11, 14, -1, -1, -1,
};
+bool Board::is_valid() {
+ bool seen[BOARD_SIZE];
+ for (int i = 0; i < BOARD_SIZE; i++) {
+ seen[i] = false;
+ }
+
+ for (int i = 0; i < BOARD_SIZE; i++) {
+ if (board[i] < 0 || board[i] >= BOARD_SIZE || seen[board[i]]) {
+ return false;
+ }
+ seen[board[i]] = true;
+ }
+
+ // Redundant because pigeon-hole-principle, but check anyway
+ for (int i = 0; i < BOARD_SIZE; i++) {
+ if (!seen[i]) {
+ return false;
+ }
+ }
+
+ return true;
+}
+
std::istream& operator>>(std::istream& is, Board& board) {
for (int i = 0; i < BOARD_SIZE; i++) {
if (!is.good()) {
is >> numeric;
board.board[i] = numeric;
}
+ if (!board.is_valid()) {
+ is.setstate(std::istream::failbit);
+ }
return is;
}
is >> b;
EXPECT_TRUE(is.fail());
}
+
+TEST(Board, RepeatedTileInput) {
+ std::istringstream is{"15,15,9,13,3,1,12,8,0,11,6,4,7,5,2,10"};
+ Board b;
+ is >> b;
+ EXPECT_TRUE(is.fail());
+}
+
+TEST(Board, LowTileInput) {
+ std::istringstream is{"-1,14,9,13,3,1,12,8,0,11,6,4,7,5,2,10"};
+ Board b;
+ is >> b;
+ EXPECT_TRUE(is.fail());
+}
+
+TEST(Board, HighTileInput) {
+ std::istringstream is{"16,14,9,13,3,1,12,8,0,11,6,4,7,5,2,10"};
+ Board b;
+ is >> b;
+ EXPECT_TRUE(is.fail());
+}