修复相关BUG + 增加单元测试, 覆盖率100%

redis.go

@@ -9,15 +9,15 @@ package consts
 
 type RedisCmd string
 
-func (rc *RedisCmd) String() string {
-	return string(*rc)
+func (rc RedisCmd) String() string {
+	return string(rc)
 }
 
-func (rc *RedisCmd) MarshalJSON() ([]byte, error) {
-	return []byte(rc.String()), nil
+func (rc RedisCmd) MarshalJSON() ([]byte, error) {
+	return []byte(`"` + rc.String() + `"`), nil
 }
 
-var (
+const (
 	RedisCommandExists       RedisCmd = "EXISTS"
 	RedisCommandTTL          RedisCmd = "TTL"
 	RedisCommandSet          RedisCmd = "SET"