/** Tests action validation. */
  @Test
  public void validate() {
    action.validate();
    assertTrue(action.hasActionErrors());
    assertEquals(1, action.getActionErrors().size());
    assertEquals(
        "struts.messages.error.must.enter.keywords", action.getActionErrors().iterator().next());

    action.clearActionErrors();
    action.prepare();
    action.getSearchParameters().setInputValues("input");
    action.validate();
    assertFalse(action.hasActionErrors());
  }