我有一个抽象缓存客户端，它有一个实现，我试图向其中添加单元测试，它有一个键的受保护类实现。

public abstract class SimpleCacheClient<V extends Serializable> {
    // Autowired RedissonClient and RedisKeyGenerator

    public V get(SimpleCacheKey key) {
        // return the cache entry from the autowired RedissonClient
    }

    public void set(SimpleCacheKey key, V value) {
        // set the cache entry
    }

    public SimpleCacheKey getCacheKey(Object...keys) {
        return new SimpleCacheKey(keyGenerator.generateKey(keys));
    }

    /**
    * Simple wrapper for cache key to guarantee that implementations
    * are using the key generator provided in this class
    */
    protected class SimpleCacheKey {
        private String key;

        SimpleCacheKey(String key) {
            this.key = key;
        }

        public String getKey() {
            return key;
        }

        @Override
        public String toString() {
            return getKey();
        }
    }
}

下面是我尝试测试的实现：

public class CacheClientImplementation extends SimpleCacheClient<ArrayList<DateTime>> {
    public void addEventDateTimes(String key, ArrayList<DateTime> eventDateTimes) {
        // Do stuff with eventDateTimes and then
        set(getCacheKey(key), eventDateTimes);
    }

    public ArrayList<DateTime> getEventDateTimes(String key) {
        ArrayList<DateTime> eventDateTimes = get(getCacheKey(key));
        // Do stuff with eventDateTimes.
        return eventDateTimes;
    }
}

我尝试测试以确保CacheClientImplementation在设置和获取之前对提供给它的值执行特定的操作。我尝试通过劫持get()和set()方法来模拟redis缓存本身，以便在测试中检查“缓存”的内容。

@RunWith(MockitoJUnitRunner.class)
public class CacheClientImplementationTest{
    @Mock
    private RedissonClient redissonClient;

    @Mock
    private RedisKeyGenerator redisKeyGenerator;

    @Spy
    @InjectMocks
    private CacheClientImplementation cacheClient = new CacheClientImplementation();

    private final HashMap<String, ArrayList<DateTime>> cacheMap = new HashMap<>();

    @Before
    public void setup() {
        Mockito.doAnswer((ver) -> {
            cacheMap.put(ver.getArgumentAt(0, Object.class).toString(), ver.getArgumentAt(1, ArrayList.class));
            return null;
        }).when(cacheClient).set(Mockito.any(), Mockito.any(ArrayList.class));
        Mockito.doAnswer((ver) -> cacheMap.getOrDefault(ver.getArgumentAt(0, Object.class).toString(), null))
            .when(cacheClient).get(Mockito.any());
    }

    @After
    public void teardown() {
        cacheMap.clear();
    }
}

但是，当我在文件中运行测试时，我最终遇到了这个问题。

C:\...\CacheClientImplementationTest.java:20: error: SimpleCacheClient.SimpleCacheKey has protected access in SimpleCacheClient
        }).when(cacheClient).set(Mockito.any(), Mockito.any(ArrayList.class));

有没有什么方法可以在不改变SimpleCacheKey的情况下对这些方法执行doAnswer？
谢谢你！