Junit Test 常见问题

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anyString()什么时候使用

1.1).比如在controller层，API地址中有映射参数时，那么when的时候(模拟service层调用)就要用到anyString()
eg:
Controller Layer:

    @DeleteMapping(value = "/detail/lock/{guid}")    @ApiOperation(value = "delete the lock ", notes = "delete the lock.", response =EntlMappingDetailInfoDtoResponse.class)    public ResponseEntity<ApiMessage<Object>> deleteObjectLock(@PathVariable String guid) {        return new ResponseEntity<>(entitlementMappingService.releaseEntitlementMappingLock(guid, CommonConstants.OBJECT_LOCK_TYPE), HttpStatus.OK);    }

Junit Test for Controller Layer:

    @Test    public void testDeleteObjectLock() throws UnsupportedEncodingException, Exception    {        String requestURI = "/detail/lock/test";        ApiMessage<Object> message = MessageUtil.getSuccessMessage(anyString());        when(entlMappingService.releaseEntitlementMappingLock(anyString(), CommonConstants.OBJECT_LOCK_TYPE)).thenReturn(message);        String response = mockMvc.perform(delete(requestURI)).andExpect(status().isOk()).andReturn().getResponse().getContentAsString();        assertNotNull(response);    }

1.2)这里releaseEntitlementMappingLock（argu1,argu2）方法第一个参数由于是从API地址传过来的，所以需要用到anyString()

Controller层delete方法参数是String[]

2.1)eg:

 @DeleteMapping(value = "/entitlementmapping")    public ResponseEntity<ApiMessage<Object>> deleteEntitlementMapping(@RequestBody String[] guids) {        return new ResponseEntity<>(entitlementMappingService.deleteEntitlementMapping(guids), HttpStatus.OK);    }

2.2)那么单元测试就应该这样写:

    @Test    public void testDeleteEntitlementMapping() throws UnsupportedEncodingException, Exception    {        String requestURI = "/entlmapping/entitlementmapping";        String[] array = { "test" };        JSONArray jsonArray = JSONArray.fromObject(array);        String requestBody = jsonArray.toString();        ApiMessage<Object> message = MessageUtil.getSuccessMessage(anyString());        when(entlMappingService.deleteEntitlementMapping(array)).thenReturn(message);        String response = mockMvc.perform(delete(requestURI).contentType(MediaType.APPLICATION_JSON).content(requestBody))            .andExpect(status().isOk()).andReturn().getResponse().getContentAsString();        assertNotNull(response);    }

多层mock问题如何处理

3.1)遇到多层mock问题这样mock，eg:

userId = String.valueOf(httpServletRequest.getSession().getAttribute(CommonConstants.OBJECT_LOCK_USER_ID_KEY));

3.2)思路，先mock:when(httpServletRequest.getSession()).thenReturn(XXX)这个，接下来再mock:
XXX.getAttribute();
3.3)当然这些httpServletRequest需要作为全局变量进行mock

    @Mock    private HttpServletRequest request;    @Mock    private HttpSession session;when(request.getSession()).thenReturn(session);

这样就不会出现空指针异常

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