Problems with unit tests Array Junit

My question and problem is as follows, I have the method fillVector where I fill a vector with random numbers and now I want to do the unit test with Junit, which is the method testValidos, and I always miss an error and I do not know if it is because the assertArrayEquals can not receive the same vector or because it is. If you can help me I would appreciate it.

public void llenarVector(int vector[]) throws Exception{  

 Random aleatorio=new Random(); 
 int n=Integer.MIN_VALUE;
//     System.out.println(vector.length);
 if (vector.length<=MAXIMO){            
    for(int i=0; i<vector.length; i++)
    {    
            boolean existe=true;
            while (existe)
                {               
                n=aleatorio.nextInt(MAXIMO);     /* Siguiente valor aleatorio */
                existe=comprobar_existe(vector,n);
                }
            vector[i]=n;
     }

 }else 
     throw new Exception("Maximo 100 elementos");

}

@Test
public void testValidos() throws Exception{
    System.out.println("Llenar vector");
    int[] vector1 = new int[3];
    int[] vectorResult= new int[3];
    VectorUtilidades instancia1 =new VectorUtilidades();
    instancia1.llenarVector(vector1);
    assertArrayEquals(vector1,vector1);
}