我正在尝试使用Powermockito为以下方法编写单元测试-

public String getGenerator(String json) throws IOException {
    String jwt = "";
    ObjectMapper mapper = new ObjectMapper();

    // convert JSON string to Map
    Map<String, Object> map = mapper.readValue(json, new TypeReference<Map<String, Object>>() {
    }); // Here passing TypeReference annonymously

    // Create a JWT
    JWTGenerator generator = new JWTGenerator();
    if (map != null && map.size() > 0) {
        jwt = generator.createJWT(map);
    }

    return jwt;
}

我已将测试方法写成-

@Test
public void testGetJWTGenerator() throws Exception {
    ObjectMapper mockMapper = PowerMockito.mock(ObjectMapper.class);
    PowerMockito.whenNew(ObjectMapper.class).withNoArguments().thenReturn(mockMapper);

    JWTGenerator mockJWTDecoder = PowerMockito.mock(JWTGenerator.class);
    PowerMockito.whenNew(JWTGenerator.class).withNoArguments().thenReturn(mockJWTDecoder);

    Map<String, Object> anyMap = new HashMap<String, Object>();
    anyMap.put("testStr", new Object());

    TypeReference<Map<String, Object>> mockTypeReference = (TypeReference<Map<String, Object>>) PowerMockito.mock(TypeReference.class);
    PowerMockito.whenNew(TypeReference.class).withNoArguments().thenReturn(mockTypeReference);

    PowerMockito.when(mockMapper.readValue(Mockito.anyString(), Mockito.eq(mockTypeReference))).thenReturn(anyMap);
    PowerMockito.when(mockJWTDecoder.createJWT(anyMap)).thenReturn(Mockito.anyString());
    utilityController = new UtilityController();
    utilityController.getJWTGenerator("{\"someStr\":\"someStr\"}");
    Mockito.verify(mockJWTDecoder, Mockito.times(1)).createJWT(anyMap);
}

当我做这个测试的时候，我总是得到失败的回答-

Wanted but not invoked:
jWTGenerator.createJWT(
    {testStr=java.lang.Object@24bdb479}
);

看起来stub不工作，因为我总是得到“null”为此行-

Map<String, Object> map = mapper.readValue(json, new TypeReference<Map<String, Object>>() {
        }); // Here passing TypeReference annonymously

是因为TypeReference类的匿名示例化吗？