如何模擬SpringStringRedisTemplate的HashOperations？

我正在為我的CacheService班級撰寫單元測驗：

public class CacheService {
    private final HashOperations<String, String, String> redisHashOps;
    private final ValueOperations<String, String> valueOps;
    private final SetOperations<String, String> setOps;


    public CacheService(StringRedisTemplate redisTemplate) {
        this.redisHashOps = redisTemplate.opsForHash();
        this.valueOps = redisTemplate.opsForValue();
        this.setOps = redisTemplate.opsForSet();
    }

單元測驗：

public class CacheServiceTest {

    private CacheService cacheService;

    private HashOperations<String, String, String> redisHashOps;
    private ValueOperations<String, String> redisValueOps;
    private SetOperations<String, String> redisSetOps;

    @BeforeEach
    public void setUp() {
        final StringRedisTemplate redisTemplate = mock(StringRedisTemplate.class);

        redisValueOps = mock(ValueOperations.class);
        redisHashOps = mock(HashOperations.class);
        redisSetOps = mock(SetOperations.class);

        when(redisTemplate.opsForValue()).thenReturn(redisValueOps);
        when(redisTemplate.opsForHash()).thenReturn(redisHashOps);
        when(redisTemplate.opsForSet()).thenReturn(redisSetOps);

redisValueOps并且redisSetOps沒有問題，但是對于redisHashOps，IDE 提示：

如果我構建專案將看到以下錯誤：

java: no suitable method found for thenReturn(org.springframework.data.redis.core.HashOperations<java.lang.String,java.lang.String,java.lang.String>)
    method org.mockito.stubbing.OngoingStubbing.thenReturn(org.springframework.data.redis.core.HashOperations<java.lang.String,java.lang.Object,java.lang.Object>) is not applicable
      (argument mismatch; org.springframework.data.redis.core.HashOperations<java.lang.String,java.lang.String,java.lang.String> cannot be converted to org.springframework.data.redis.core.HashOperations<java.lang.String,java.lang.Object,java.lang.Object>)
    method org.mockito.stubbing.OngoingStubbing.thenReturn(org.springframework.data.redis.core.HashOperations<java.lang.String,java.lang.Object,java.lang.Object>,org.springframework.data.redis.core.HashOperations<java.lang.String,java.lang.Object,java.lang.Object>...) is not applicable
      (argument mismatch; org.springframework.data.redis.core.HashOperations<java.lang.String,java.lang.String,java.lang.String> cannot be converted to org.springframework.data.redis.core.HashOperations<java.lang.String,java.lang.Object,java.lang.Object>)

查看RedisTemplate的原始碼發現了opsForHash和opsForValue的區別：

public <HK, HV> HashOperations<K, HK, HV> opsForHash() ...
public ValueOperations<K, V> opsForValue() ...

如何修改單元測驗以使其作業？

uj5u.com熱心網友回復：

您可以doReturn改用以下方法重寫您的模擬期望：

doReturn(redisHashOps).when(redisTemplate).opsForHash();

uj5u.com熱心網友回復：

你發現它是正確的：

在第一種（也是最后一種）情況下<K, V>是指RedisTemplate泛型引數（在<String, String>此處分配）。

在 的情況下<HK, HV> HashOperations<K, HK, HV>，K是“再次安全”，但是<HK, HV>是“方法泛型引數”，編譯器無法在此處推斷。

解決方案：

• 正如 armandino 正確建議的那樣：

  doReturn(redisHashOps).when(redisTemplate).opsForHash();
  

  我們讓編譯器免于猜測。
• 或通過“通用引數”：

  when(redisTemplate.<String,String>opsForHash()).thenReturn(redisHashOps);
  

• 或“原始”/殘酷的方法：

  private HashOperations<String, Object, Object> redisHashOps;
  ...
  when(redisTemplate.opsForHash()).thenReturn(redisHashOps);
  

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