static int[] divisors(int a)
    {
        int[] array = new int[a];
        int x = 0;


        for( int i =2; i<a; i++)
        {

            if(a % i == 0)
            {
                array[x] = i;
                x++;
            }

        }

        if(array.Length == 0)
        {

            return null;
        }
        else
        {
            return array;
        }

    }

"Expected is <System.Int32[2]>, actual is <System.Int32[15]>
  Values differ at index [2]
  Extra:    < 0, 0, 0... >"