Game end: Player wins, with Test

src/main/java/TicTacToe/TicTacToeGame.java

@@ -5,6 +5,7 @@ import java.awt.Graphics2D;
 import java.awt.geom.Line2D;
 
 import javax.swing.JFrame;
+import javax.swing.JOptionPane;
 import javax.swing.JPanel;
 
 
@@ -67,11 +68,33 @@ public class TicTacToeGame extends JPanel {
 	}
 
 	public void endTurn() {
+		
+		if(checkPlayfield() != 0) {
+			JOptionPane.showMessageDialog(getParent(),"Player: " + player + " Wins!");	
+			System.exit(0);
+		}
+
 		player++;
 		if(player >= 3) {
 			player = 1;
 		}
+	}
+
+	public int checkPlayfield() {
+		if ((field[0].value == player && field[1].value == player && field[2].value == player)
+				|| (field[0].value == player && field[3].value == player && field[6].value == player)
+				|| (field[8].value == player && field[5].value == player && field[2].value == player)
+				|| (field[8].value == player && field[7].value == player && field[6].value == player)
+				|| (field[0].value == player && field[4].value == player && field[8].value == player)
+				|| (field[0].value == player && field[4].value == player && field[8].value == player)
+				|| (field[2].value == player && field[4].value == player && field[6].value == player)
+				|| (field[3].value == player && field[4].value == player && field[5].value == player)
+				|| (field[1].value == player && field[4].value == player && field[7].value == player)) {
+
+			return player;
+		}
 
+		return 0;
 	}
 
 

src/main/java/TicTacToe/cell.java

@@ -7,7 +7,7 @@ import javax.swing.JButton;
 
 public class cell extends JButton {
 
-	int value = 0;
+	public int value = 0;
 	private TicTacToeGame ttt;
 	
 	public cell(TicTacToeGame _ttt) {

src/test/java/TicTacToe/TicTacToeGameTest.java

@@ -1,8 +1,48 @@
 package TicTacToe;
 
 import static org.junit.jupiter.api.Assertions.*;
+
+import java.util.stream.Stream;
+
 import org.junit.jupiter.api.Test;
+import org.junit.jupiter.params.ParameterizedTest;
+import org.junit.jupiter.params.provider.Arguments;
+import org.junit.jupiter.params.provider.MethodSource;
+
+import Arcade64.Arcade64.Code;
 
 class TicTacToeGameTest {
 	
+	@ParameterizedTest
+	@MethodSource("testFieldsWinning")
+	void testGameEndWin(int[] _field, int _winner) {
+		TicTacToeGame ttt = new TicTacToeGame();
+		
+		for(int i = 0; i < ttt.field.length; i++) {
+			ttt.field[i].value = _field[i];
+		}
+		ttt.player = _winner;
+		int realWinner = ttt.checkPlayfield();
+		
+		assertEquals(_winner, realWinner);
+	}
+	
+	private static Stream<Arguments> testFieldsWinning(){
+		return Stream.of(
+				Arguments.of(new int[]{	1,2,1,
+										2,2,2,
+										1,2,1}, 2),
+				Arguments.of(new int[]{	2,1,2,
+										2,2,1,
+										1,1,1}, 1),
+				Arguments.of(new int[]{	1,1,2,
+										1,2,2,
+										1,2,1}, 1),
+				Arguments.of(new int[]{	2,1,1,
+										1,2,1,
+										1,1,2}, 2)
+				);
+				
+		
+	}
 }