@Test
  public void findCollaboratorByAccount() {
    RiverCollaborator rc = riverDao.findCollaborator(1L, 4L);

    assertEquals(1L, (long) rc.getId());
    assertEquals(4L, rc.getAccount().getId());
  }
  @Test
  public void findNonExistentCollaboratorByAccount() {
    RiverCollaborator rc = riverDao.findCollaborator(1L, 10L);

    assertNull(rc);
  }