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app/src/main/java/gui/SudokuView.java

@@ -1,6 +1,8 @@
 package gui;
 
 import javax.swing.*;
+import javax.swing.border.Border;
+
 import java.awt.*;
 import java.awt.event.*;
 
@@ -27,24 +29,42 @@ public class SudokuView extends JFrame {
         setTitle("Sudoku Solver");
         setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
         setLayout(new BorderLayout());
+        setIconImage(new ImageIcon("src/main/resources/sudoku.png").getImage());
 
         initializeGrid();
         initializeButtons();
 
-        pack();
-        setLocationRelativeTo(null);
+        setMinimumSize(new Dimension(500, 500));
+        pack(); // Resize the window to fit the components, if necessary
+        setLocationRelativeTo(null); // Center the window
     }
 
     /** Initialize the grid, called by the constructor */
     private void initializeGrid() {
         grid = new JTextField[9][9];
         JPanel gridPanel = new JPanel(new GridLayout(9, 9));
+        gridPanel.setBorder(BorderFactory.createEmptyBorder(5, 5, 5, 5));
+
+        int fontSize = 24;
+        String fontName = gridPanel.getFont().getName();
+        Border border = BorderFactory.createLineBorder(Color.BLACK);
+        Font font = new Font(fontName, Font.BOLD, fontSize);
 
         for (int row = 0; row < 9; row++) {
             for (int col = 0; col < 9; col++) {
-                grid[row][col] = new JTextField(2);
-                grid[row][col].setHorizontalAlignment(JTextField.CENTER);
-                gridPanel.add(grid[row][col]);
+                JTextField cell = new JTextField(2);
+                cell.setHorizontalAlignment(JTextField.CENTER);
+                cell.setFont(font);
+                cell.setBorder(border);
+                cell.setForeground(Color.BLACK);
+
+                // Set background color to gray for every third JTextField
+                if ((row / 3 + col / 3) % 2 == 1) {
+                    cell.setBackground(Color.LIGHT_GRAY);
+                }
+
+                grid[row][col] = cell;
+                gridPanel.add(cell);
             }
         }
 

app/src/main/java/sudoku/Solver.java

@@ -20,10 +20,18 @@ public class Solver implements SudokuSolver {
         this.board = board;
     }
 
-    /** {@inheritDoc} */
+    /**
+     * {@inheritDoc}
+     * <p>
+     * Note that this returns a copy of the board, not the actual board
+     */
     @Override
     public int[][] getBoard() {
-        return board;
+        int[][] copy = new int[9][9];
+        for (int row = 0; row < 9; row++) {
+            System.arraycopy(board[row], 0, copy[row], 0, 9);
+        }
+        return copy;
     }
 
     /** Resets the board to all zeros */
@@ -34,7 +42,6 @@ public class Solver implements SudokuSolver {
                 row[i] = 0;
             }
         }
-        // board = new int[9][9];
     }
 
     /* {@inheritDoc} */

app/src/test/java/sudoku/SolverTest.java

@@ -17,8 +17,12 @@ class SolverTest {
         Solver solver = new Solver();
         int[][] board = new int[9][9];
         solver.setBoard(board);
-        assertEquals(board, solver.getBoard());
+
+        for (int row = 0; row < 9; row++) {
+            assertArrayEquals(board[row], solver.getBoard()[row]);
         }
+    }
+    
 
     @Test
     void randomizeBoardTest() {
@@ -28,6 +32,12 @@ class SolverTest {
         assertNotEquals(board, solver.getBoard());
     }
 
+    @Test
+    void emptyTest() {
+        Solver solver = new Solver();
+        assertTrue(solver.solve());
+    }
+
     @Test
     void legalTest() {
         Solver solver = new Solver();