How can I test the Hystrix-Fallback with JUnit MockMVC - spring

Question

I need help with the jUnit testing, my result is json, and I need to test the Fallback method, that I bacome the RuntimeException that I build in the Update method in the Service. The test dont go to the fallback.
Controller.java
private static final Score defaultScore = new Score("Team1", "Team2", 1, 1);
#PutMapping(path = "")
#HystrixCommand(fallbackMethod = "updateScoreFallback")
public ResponseEntity<Score> updateScore(#RequestBody Score score) {
Score s = scoreService.updateScore(score);
return new ResponseEntity<>(s, headers, HttpStatus.OK);
}
public ResponseEntity<Score> updateScoreFallback(Score score) {
return new ResponseEntity<>(defaultScore, headers, HttpStatus.SERVICE_UNAVAILABLE);
}
My Test
#NoArgsConstructor
#RunWith(SpringRunner.class)
#WebMvcTest(value = ScoreController.class, secure = false)
public class ScoreControllerExceptionTests {
#Autowired
private MockMvc mockMvc;
#MockBean
private ScoreService ScoreService;
private ScoreController ScoreController;
private static final String basePath = "/v1/score";
private static final Score Score = new Score("Team1", "Team2", 1, 1);
private static final String mockScoreJson = "{\"id\":0,\"team_name1\":\"Team1\",\"team_name2\":\"Team2\",\"score_team1\":1,\"score_team2\":1}";
private static final List<Score> scoreList = Collections.singletonList(score);
private static final String mockScoreListJson = "[" + mockScoreJson + "]";
#Before
public void setUp() {
ScoreRepo scoreRepo = new ScoreRepoExceptionStub();
scoreService = new ScoreServiceImpl(scoreRepo);
scoreController = new ScoreController(scoreService);
mockMvc = MockMvcBuilders.standaloneSetup(scoreController).build();
}
#Test
public void updateScoreControllerException() throws Exception{
String result = mockMvc.perform(MockMvcRequestBuilders
.put(basePath)
.accept(MediaType.APPLICATION_JSON)
.content(mockScoreJson)
.contentType(MediaType.APPLICATION_JSON))
.andReturn()
.getResponse()
.getContentAsString();
Assert.assertEquals(mockScoreJson, result, true);
}
....
Thanks for the helps