Added isCellInBoard for checking positions with test

src/main/java/Game/ChessObj/ChessBoard.java

@@ -70,12 +70,18 @@ public class ChessBoard {
         String[][] cellSymbol = new String[8][8];
         for (int y = 0; y < board.length; y++) {
             for (int x = 0; x < board[0].length; x++) {
-                cellSymbol[y][x] = (board[y][x] == null)?"   ": board[y][x].getSymbol();
+                cellSymbol[y][x] = (board[y][x] == null) ? "   " : board[y][x].getSymbol();
             }
         }
         return cellSymbol;
     }
 
+    public boolean isCellInBoard(int x, int y){
+        if(x >= 0 && x < board[0].length && y >= 0 && y < board.length)
+            return true;
+        return false;
+    }
+
     public ChessFigure[][] getBoard() {
         return this.board;
     }

src/test/java/Game/ChessObj/ChessBoardTest.java

@@ -66,4 +66,15 @@ class ChessBoardTest {
         };
         assertArrayEquals(expectedArray, chessBoard.getCellSymbols());
     }
+
+    @Test
+    void isCellInBoard() {
+        assertTrue(chessBoard.isCellInBoard(0, 0));
+        assertTrue(chessBoard.isCellInBoard(7, 7));
+        assertTrue(chessBoard.isCellInBoard(2, 1));
+        assertTrue(chessBoard.isCellInBoard(5, 7));
+        assertFalse(chessBoard.isCellInBoard(-1, 0));
+        assertFalse(chessBoard.isCellInBoard(4, 8));
+        assertFalse(chessBoard.isCellInBoard(10, 20));
+    }
 }