@Test
  public void updateAmount_ok() {
    Long customerNumber = 455L;
    String checkNumber = "IR662429";

    BigDecimal a1 = new BigDecimal("32239.47");

    Integer u1 = paymentService.updateAmount(customerNumber, checkNumber, a1);
    assertThat(u1, is(1));

    Payment p1 = paymentService.findByPk(customerNumber, checkNumber);
    assertThat(p1, notNullValue());
    assertThat(p1.getAmount(), is(a1));
    System.out.println(p1.toString());

    BigDecimal a2 = new BigDecimal("77777.88");

    Integer u2 = paymentService.updateAmount(customerNumber, checkNumber, a2);
    assertThat(u2, is(1));

    Payment p2 = paymentService.findByPk(customerNumber, checkNumber);
    assertThat(p2, notNullValue());
    assertThat(p2.getAmount(), is(a2));
    System.out.println(p2.toString());
  }