Test Backtracking NQueens

docs/test/test_backtracking_nqueen.jav

+package com.gpcoder.junit.util;
+import org.junit.Assert;
+import org.junit.Test;
+public class solveNQueensTest {
+     public void dfsTest() {
+      List<List<String>> resultList = new LinkedList<>();
+      final int[] expected = [2, 4, 6, 8, 3, 1, 7, 5];
+      final int[] result = new int[8];
+      dfs(resultList, result, 0, 8);
+      Assert.assertArrayEquals(expected, result);
+     }
+     public void dfsTest2() {
+      List<List<String>> resultList = new LinkedList<>();
+      final int[] expected = [2, 4, 1, 3];
+      final int[] result = new int[4];
+      dfs(resultList, result, 0, 4);
+      Assert.assertArrayEquals(expected, result);
+     }
+      public void dfsTest3() {
+      List<List<String>> resultList = new LinkedList<>();
+      final int[] expected = [];
+      final int[] result = new int[3];
+      dfs(resultList, result, 0, 3);
+      Assert.assertArrayEquals(expected, result);
+     }
+}