go get github.com/go-redis/redismock/v9

var ctx = context.TODO() func NewsInfoForCache(redisDB *redis.Client, newsID int) (info string, err error) { cacheKey := fmt.Sprintf("news_redis_cache_%d", newsID) info, err = redisDB.Get(ctx, cacheKey).Result() if err == redis.Nil { // info, err = call api() info = "test" err = redisDB.Set(ctx, cacheKey, info, 30 * time.Minute).Err()	} return } func TestNewsInfoForCache(t *testing.T) { db, mock := redismock.NewClientMock() newsID := 123456789 key := fmt.Sprintf("news_redis_cache_%d", newsID) // mock ignoring `call api()` mock.ExpectGet(key).RedisNil() mock.Regexp().ExpectSet(key, `[a-z]+`, 30 * time.Minute).SetErr(errors.New("FAIL")) _, err := NewsInfoForCache(db, newsID) if err == nil || err.Error() != "FAIL" { t.Error("wrong error")	} if err := mock.ExpectationsWereMet(); err != nil { t.Error(err)	} }

clusterClient, clusterMock := redismock.NewClusterMock()