@Override
  public String toString() {
    return "MappingRule{" +
      "matcher=" + matcher +
      ", action=" + action +
      '}';
  }
@Test
  public void testToStrings() {
    MappingRuleAction action = new MappingRuleActions.PlaceToQueueAction(
        "queue", true);
    MappingRuleMatcher matcher = MappingRuleMatchers.createUserMatcher("bob");
    MappingRule rule = new MappingRule(matcher, action);

    assertEquals("MappingRule{matcher=" + matcher.toString() +
        ", action=" + action.toString() + "}", rule.toString());
  }