Add bomb placement

src/main/java/Minesweeper/MinesweeperGame.java

@@ -10,12 +10,14 @@ public class MinesweeperGame extends JPanel {
 	private static final int WIDTH = 600, HEIGTH = 600;
 	private static final int CELLSIZE = 40;
 	private int playfieldSize;
+	private int bombAmount;
 
 	public Cell[][] playfield;
 
-	public MinesweeperGame(int _playfieldSize) {
+	public MinesweeperGame(int _playfieldSize, int _bombAmount) {
 		this.setSize(WIDTH, HEIGTH);
 		playfieldSize = _playfieldSize;
+		bombAmount = _bombAmount;
 		setLayout(null);
 
 		initPlayfield();
@@ -25,19 +27,39 @@ public class MinesweeperGame extends JPanel {
 
 		playfield = new Cell[playfieldSize][playfieldSize];
 
+		int[] bPlacment = new int[bombAmount];
+		for (int i = 0; i < bPlacment.length; i++) {
+			bPlacment[i] = (int) (Math.random() * playfieldSize * playfieldSize);
+
+			for (int j = 0; j < i; j++) {
+				if (bPlacment[i] == bPlacment[j]) {
+					i--;
+					break;
+				}
+			}
+		}
+
 		for (int i = 0; i < playfieldSize; i++) {
 			for (int j = 0; j < playfieldSize; j++) {
-				Cell c = new Cell(CellType.Number);
-				c.setBounds(j * CELLSIZE + (WIDTH / 2 - playfieldSize * CELLSIZE / 2), i * CELLSIZE + (HEIGTH / 2 - playfieldSize * CELLSIZE / 2), CELLSIZE,
-						CELLSIZE);
-				add(c);
+				playfield[i][j] = new Cell(CellType.Number);
+				
+				playfield[i][j].setBounds(j * CELLSIZE + (WIDTH / 2 - playfieldSize * CELLSIZE / 2),
+						i * CELLSIZE + (HEIGTH / 2 - playfieldSize * CELLSIZE / 2), CELLSIZE, CELLSIZE);
+				add(playfield[i][j]);
+				
+				for (int k = 0; k < bPlacment.length; k++) {
+					if (bPlacment[k] == i * playfieldSize + j) {
+						playfield[i][j].type = CellType.Bomb;
+						break;
+					}
+				}
 			}
 		}
 	}
 
 	public static void main(String[] args) {
 		JFrame f = new JFrame();
-		MinesweeperGame ttt = new MinesweeperGame(8);
+		MinesweeperGame ttt = new MinesweeperGame(8, 10);
 
 		f.add(ttt);
 		f.setSize(WIDTH, HEIGTH);

src/test/java/Minesweeper/MinesweeperGameTest.java

@@ -0,0 +1,41 @@
+package Minesweeper;
+
+import static org.junit.jupiter.api.Assertions.*;
+
+import java.util.stream.Stream;
+
+import org.junit.jupiter.params.ParameterizedTest;
+import org.junit.jupiter.params.provider.Arguments;
+import org.junit.jupiter.params.provider.MethodSource;
+
+class MinesweeperGameTest {
+
+	@ParameterizedTest
+	@MethodSource("testBombs")
+	void testBombPlacement(int _playfieldSize, int _bombAmount) {
+		MinesweeperGame m = new MinesweeperGame(_playfieldSize, _bombAmount);
+		
+		int bombCounter = 0;
+		
+		for(Cell[] row : m.playfield){
+			for (Cell c : row) {
+				if(c.type == CellType.Bomb) {
+					bombCounter++;
+				}
+			}
+		}
+ 		assertEquals(_bombAmount, bombCounter); 
+	}
+
+	
+	private static Stream<Arguments> testBombs(){
+		return Stream.of(
+				Arguments.of(8, 10),
+				Arguments.of(8, 0),
+				Arguments.of(4, 12),
+				Arguments.of(10, 100),
+				Arguments.of(5, 1)	
+				);
+	}
+	
+}