Java怎样单测void类型的方法？

Java的Sevice层会有很多void类型的方法，比如save*、update*，这类方法只是做一些更新，不会有返回值，其单测不能根据方法的返回值来编写，只能采用特殊方法；

本方法环境：Mockito、testng

被测试的方法：

想要被测试的VOID方法

Java

@Override public void updateRuleName(Long ruleId, String newRuleName, Long ucId) { Assert.notNull(ruleId, "规则ID不能为Null"); Assert.notNull(newRuleName, "规则名称不能为Null"); Assert.notNull(ucId, "操作人的UCID不能为Null"); String cleanNewRuleName = StringUtils.trim(newRuleName); if (StringUtils.isBlank(cleanNewRuleName)) { throw new IllegalArgumentException("新的规则名称不能为空"); } // 查询规则对象 Rule rule = queryRuleById(ruleId); if (null == rule) { throw new IllegalDataException("没有查到该规则"); } rule.setRuleId(ruleId); rule.setRuleName(cleanNewRuleName); rule.setUpdateUcid(ucId); rule.setUpdateTime(new Date()); ruleDao.updateSelective(rule); }

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@Override      public void updateRuleName ( Long ruleId , String newRuleName , Long ucId ) {          Assert . notNull ( ruleId , "规则ID不能为Null" ) ;          Assert . notNull ( newRuleName , "规则名称不能为Null" ) ;          Assert . notNull ( ucId , "操作人的UCID不能为Null" ) ;                   String cleanNewRuleName = StringUtils . trim ( newRuleName ) ;          if ( StringUtils . isBlank ( cleanNewRuleName ) ) {              throw new IllegalArgumentException ( "新的规则名称不能为空" ) ;          }                   // 查询规则对象          Rule rule = queryRuleById ( ruleId ) ;          if ( null == rule ) {              throw new IllegalDataException ( "没有查到该规则" ) ;          }                   rule . setRuleId ( ruleId ) ;          rule . setRuleName ( cleanNewRuleName ) ;          rule . setUpdateUcid ( ucId ) ;          rule . setUpdateTime ( new Date ( ) ) ;                   ruleDao . updateSelective ( rule ) ;      }

测试的方法：

void返回的方法测试

Java

@Test public void testUpdateRuleName() { Long ruleId = 1L; String newRuleName = "newRuleName"; Long ucId = 123L; List rules = new ArrayList(); Rule rule = new Rule(); rule.setRuleStatus((byte) DBValueSetting.RULE_STATUS_TAKE_EFFECT); rules.add(rule); // 查询规则对象 Map params = new HashMap(); params.put("ruleId", ruleId); Mockito.when(ruleDao.queryRulesByCondition(params)).thenReturn(rules); Mockito.doAnswer(new Answer