How do I write a test code for this? Also, I need to add one extra method for ma

Question

 How do I write a test code for this? Also, I need to add one extra method for manipulating an int array.  public class IAM {    public static void rotateDown( int[] a )   {     int temp = a[a.length-1];          for( int i=a.length-2; i >= 0; i-- )     {       a[i+1] = a[i];     }          a[0] = temp;   }         public static void print( int[] a )   {     for( int i=0; i < a.length; i++ )     {       System.out.print( a[i] + " " );     }     System.out.println(); // move cursor to new line   }      public static int search( int[] a, int n )   {     int rv=-1; // not found return value     int i=0; // array index     boolean found=false;          while( i < a.length && !found)     {       if ( a[i] == n )       {         found=true;         rv=i;       }              i++;     }// while          return rv;   }// method  } 

Explanation / Answer

import java.util.Scanner;

import java.util.Scanner;

public class IAM
{
   public static final int MAX = 10;
   public static Scanner input = new Scanner(System.in);
  
  
public static void rotateDown( int[] a )
{
    int temp = a[a.length-1];
  
    for( int i=a.length-2; i >= 0; i-- )
    {
      a[i+1] = a[i];
    }
  
    a[0] = temp;
}


public static void print( int[] a )
{
    for( int i=0; i < a.length; i++ )
    {
      System.out.print( a[i] + " " );
    }
    System.out.println(); // move cursor to new line
}

public static int search( int[] a, int n )
{
    int rv=-1; // not found return value
    int i=0; // array index
    boolean found=false;
  
    while( i < a.length && !found)
    {
      if ( a[i] == n )
      {
        found=true;
        rv=i;
      }
    
      i++;
    }// while
  
    return rv;
}// method

static int manipulatingArray(int array[],int len) // new method for manipulating int array
{
   int count=0;
   System.out.println("Enter "+len+" positive integers");
   System.out.println("Enter -1 to exit");
   int i=input.nextInt();
   while(i!=-1)
   {
       array[count]=i;
       count++;
       i=input.nextInt();

   }
   return count;
}

public static void main(String[] args) // test code
{
   System.out.println("Enter array length");
   int len=input.nextInt();
int array[]=new int[len];
int elements=manipulatingArray(array,len);
System.out.println("Enter element to search");
int num=input.nextInt();
if(search(array,num)!=-1)
System.out.println("Element found at "+search(array,num)+" index");
else
   System.out.println("Element not found");
rotateDown(array);
System.out.println("Array after Rotate Down");
print(array);

  
}
  
}

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