Add tests Sudoku

Author: gtantaro

src/test/java/com/thealgorithms/others/SudokuTest.java

@@ -0,0 +1,74 @@
+package com.thealgorithms.others;
+
+import static org.junit.jupiter.api.Assertions.assertEquals;
+import static org.junit.jupiter.api.Assertions.assertFalse;
+import static org.junit.jupiter.api.Assertions.assertThrows;
+import static org.junit.jupiter.api.Assertions.assertTrue;
+
+import org.junit.jupiter.api.Test;
+
+public class SudokuTest {
+
+    @Test
+    void testIsSafe2() {
+        int[][] board = {
+            {3, 0, 6, 5, 0, 8, 4, 0, 0},
+            {5, 2, 0, 0, 0, 0, 0, 0, 0},
+            {0, 8, 7, 0, 0, 0, 0, 3, 1},
+            {0, 0, 3, 0, 1, 0, 0, 8, 0},
+            {9, 0, 0, 8, 6, 3, 0, 0, 5},
+            {0, 5, 0, 0, 9, 0, 6, 0, 0},
+            {1, 3, 0, 0, 0, 0, 2, 5, 0},
+            {0, 0, 0, 0, 0, 0, 0, 7, 4},
+            {0, 0, 5, 2, 0, 6, 3, 0, 0}
+        };
+
+        assertFalse(Sudoku.isSafe(board, 0, 1, 3));
+        assertTrue(Sudoku.isSafe(board, 1, 2, 1));
+        assertThrows(ArrayIndexOutOfBoundsException.class, () -> {
+            Sudoku.isSafe(board, 10, 10, 5);
+        });
+        assertThrows(ArrayIndexOutOfBoundsException.class, () -> {
+            Sudoku.isSafe(board, -1, 0, 5);
+        });
+    }
+
+    @Test
+    void testSolveSudoku() {
+        int[][] board = {
+            {3, 0, 6, 5, 0, 8, 4, 0, 0},
+            {5, 2, 0, 0, 0, 0, 0, 0, 0},
+            {0, 8, 7, 0, 0, 0, 0, 3, 1},
+            {0, 0, 3, 0, 1, 0, 0, 8, 0},
+            {9, 0, 0, 8, 6, 3, 0, 0, 5},
+            {0, 5, 0, 0, 9, 0, 6, 0, 0},
+            {1, 3, 0, 0, 0, 0, 2, 5, 0},
+            {0, 0, 0, 0, 0, 0, 0, 7, 4},
+            {0, 0, 5, 2, 0, 6, 3, 0, 0}
+        };
+
+        assertTrue(Sudoku.solveSudoku(board, board.length));
+        assertEquals(1, board[0][1]);
+        assertThrows(ArrayIndexOutOfBoundsException.class, () -> {
+            Sudoku.solveSudoku(board, 10);
+        });
+        assertTrue(Sudoku.solveSudoku(board, -1));
+    }
+
+    @Test
+    void testUnsolvableSudoku() {
+        int[][] unsolvableBoard = {
+            {5, 1, 6, 8, 4, 9, 7, 3, 2},
+            {3, 0, 7, 6, 0, 5, 0, 0, 0},
+            {8, 0, 9, 7, 0, 0, 0, 6, 5},
+            {1, 3, 5, 0, 6, 0, 9, 0, 7},
+            {4, 7, 2, 5, 9, 1, 0, 0, 6},
+            {9, 6, 8, 3, 7, 0, 0, 5, 0},
+            {2, 5, 3, 1, 8, 6, 0, 7, 4},
+            {6, 8, 4, 2, 5, 7, 3, 9, 0},
+            {7, 9, 1, 4, 3, 0, 5, 0, 0}
+        };
+
+        assertFalse(Sudoku.solveSudoku(unsolvableBoard, unsolvableBoard.length));
+    }
+}