hello, I suppose to create simple test case using a Junit test But i keep gettin

Question

hello, I suppose to create simple test case using a Junit test

But i keep getting error, I dont know exact problem , could you f help me please

COde

package select;

public class selectionSort2 {

   public static void main(String[] args)
   {
   int n = 20;
   int[] numArray = unsortedArray(n); // re-initialize
   printArray(numArray,n);
   selectSort2(numArray, n);
   printArray(numArray, n);
   }
     
     
   //Generate data for the selection sort array
   public static int[] unsortedArray(int n) {
   int[] a = new int[n];
   for (int index = 0; index < n; index++) {
   a[index] = (n - index);
   }
   return a;
   }
   //print the array
   public static void printArray(int[] data, int n)
   {
   for (int index = 0; index < n; index++) {
   System.out.print(data[index] + " ");
   }
   System.out.println();
   } public static void selectSort2(int[] data, int n)
   {
   for (int numUnsorted = n; numUnsorted > 0; numUnsorted--) {
   int maxIndex = 0;
   for (int index = 1; index < numUnsorted; index++) {
   if (data[maxIndex] < data[index])
   maxIndex = index;
   //swap the element
   int temp = data[numUnsorted-1];
   data[numUnsorted-1] = data[maxIndex];
   data[maxIndex] = temp;
     
   }
   }
   }
   }

Junit test code

package select;

import static org.junit.Assert.*;

import org.junit.Test;

/**
* @author secc
*
*/

public static void testSelectSort2() {
      
      
       selectionSort2 test = new selectionSort2();
       int[] num = { 20, 19, 18, 17, 16, 15, 14, 13, 12, 11, 10, 9, 8, 7,
   6, 5, 4, 3, 2, 1 };
   int act=0;
   act++;
   int[] expected = { 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16,
   17, 18, 19, 20 };
   selectionSort2.selectSort2(num, act);
   assertArrayEquals(expected, num);
       }

}

I got initialzing error and test got error

Explanation / Answer

public class selectionSort2 { public static void main(String[] args) { int n = 20; int[] numArray = unsortedArray(n); // re-initialize printArray(numArray,n); selectSort2(numArray, n); printArray(numArray, n); } //Generate data for the selection sort array public static int[] unsortedArray(int n) { int[] a = new int[n]; for (int index = 0; index

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