Add tests Sudoku (TheAlgorithms#5722)

* Add tests Sudoku

* Fix

* Update file

---------

Co-authored-by: Giulio Tantaro <[email protected]>
Co-authored-by: Alex Klymenko <[email protected]>

Author: 3 people

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

@@ -0,0 +1,38 @@
+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));
+    }
+}