小编Sau*_*ath的帖子

我是春季启动单元测试的新手。我正在尝试测试一项服务，并为此使用了 Mockito。当我执行 mvc.perform() 时，我得到一个空值。我使用 when() 来指定要返回的内容。但不知道为什么会失败。请提供一些有价值的意见。以下是 fe 片段：

@Test
public void testAll() throws Exception {

    /*Mockito.when(sensorDao.findAll()).thenReturn((Iterable<Sensor>) s2);
    assertEquals(200,expect().statusCode(200));*/

    Collection<Sensor>list =  getEntityListStubData();
    when(sensorserviceimpl.findAll()).thenReturn(list);
    when(sensorService.findAll()).thenReturn(list);
    when(sensorDao.findAll()).thenReturn(list);
    String uri="/sensor";
    //System.out.print("gfnjhkjjhhg");
    System.out.println("Helllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllloooooooooooooooooooooooooooooooooooooooooooo");
    System.out.println(MockMvcRequestBuilders.get(uri).accept(MediaType.APPLICATION_JSON));
    MvcResult result = mvc.perform(MockMvcRequestBuilders.get(uri).accept(MediaType.APPLICATION_JSON)).andReturn();
    String content = result.getResponse().getContentAsString();
    int status = result.getResponse().getStatus();
 }

这是输出：

2017-08-18 19:11:45.030  INFO 21424 --- [           main] o.s.t.c.transaction.TransactionContext   : Rolled back transaction for test context [DefaultTestContext@35083305 testClass = SensorServiceStandaloneApplicationTests, testInstance = com.bny.sr.sensorservicestandalone.SensorServiceStandaloneApplicationTests@482cd91f, testMethod = testAll@SensorServiceStandaloneApplicationTests, testException = java.lang.NullPointerException, mergedContextConfiguration = [WebMergedContextConfiguration@8e0379d testClass = SensorServiceStandaloneApplicationTests, locations = '{}', …