This is the second win condition, which is pretty similar to the previous one.
If a player inserts a disc and connects more than three discs of his color in a straight horizontal line, then that player wins.
This time, we are trying to win the game by inserting discs into adjacent columns:
@Test
public void when4HorizontalDiscsAreConnectedThenPlayerWins() {
int column;
for (column = 0; column < 3; column++) {
tested.putDiscInColumn(column); // R
tested.putDiscInColumn(column); // G
}
assertThat(tested.getWinner(), isEmptyString());
tested.putDiscInColumn(column); // R
assertThat(tested.getWinner(), is("R"));
}
The code to pass this test is put into the checkWinners method:
if (winner.isEmpty()) {
String horizontal = Stream
.of(board[row])
.reduce(String::concat).get();
if (winPattern.matcher(horizontal).matches())
winner = colour;
}