Gather data

src/test/java/puzzle/MainTest.java

@@ -29,35 +29,36 @@ public class MainTest {
             grid.setCharAt(r, c, C_DASH);
          }
       }
-
+      
       // Test set/get
       grid.setCharAt(0, 0, 'A');
       grid.setCharAt(1, 2, '5');
       grid.setCharAt(2, 3, 'Z');
-
+      
       Assertions.assertEquals('A', grid.getCharAt(0, 0));
       Assertions.assertEquals('5', grid.getCharAt(1, 2));
       Assertions.assertEquals('Z', grid.getCharAt(2, 3));
       Assertions.assertEquals(C_DASH, grid.getCharAt(1, 1));
-
+      
       // Test isLetterAt
       Assertions.assertTrue(grid.isLetterAt(0, 0));
       Assertions.assertFalse(grid.isLetterAt(1, 2));
       Assertions.assertTrue(grid.isLetterAt(2, 3));
       Assertions.assertFalse(grid.isLetterAt(1, 1));
-
+      
       // Test isDigitAt
       Assertions.assertFalse(grid.isDigitAt(0, 0));
       Assertions.assertTrue(grid.isDigitAt(1, 2));
+      Assertions.assertEquals(5, grid.digitAt(1, 2));
       Assertions.assertFalse(grid.isDigitAt(2, 3));
       Assertions.assertFalse(grid.isDigitAt(1, 1));
-
+      
       // Test isLettercell
       Assertions.assertTrue(grid.isLettercell(0, 0)); // 'A' is letter
       Assertions.assertFalse(grid.isLettercell(1, 2)); // '5' is digit
       Assertions.assertTrue(grid.isLettercell(1, 1)); // '#' is lettercell
    }
-
+   
    @Test
    public void testGridDeepCopy() {
       var grid = new Grid(new byte[2 * 2], 2, 2);
@@ -65,7 +66,7 @@ public class MainTest {
       grid.setCharAt(0, 1, 'B');
       grid.setCharAt(1, 0, 'C');
       grid.setCharAt(1, 1, 'D');
-
+      
       var copy = grid.deepCopyGrid();
       Assertions.assertEquals('A', copy.getCharAt(0, 0));
       
@@ -73,8 +74,7 @@ public class MainTest {
       Assertions.assertEquals('X', copy.getCharAt(0, 0));
       Assertions.assertEquals('A', grid.getCharAt(0, 0)); // Original should be unchanged
    }
-
-
+   
    @Test
    public void testMini() {
       var grid = new Grid(new byte[3 * 3], 3, 3);