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：@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：@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