test: ensure the transaction is legit durling the resharding

[supercaracal]

The test case is not enough and I found that the implementation of the handling replies for the transaction is corrupted.

• Implementation for transaction #299

[supercaracal]

https://redis.io/docs/interact/transactions/#errors-inside-a-transaction

Errors happening after EXEC instead are not handled in a special way: all the other commands will be executed even if some command fails during the transaction. It's important to note that even when a command fails, all the other commands in the queue are processed – Redis will not stop the processing of commands.

$ telnet 127.0.0.1 6379
set key3 a
+OK
multi
+OK
set key3 b
+QUEUED
incr key3
+QUEUED
exec
*2
+OK
-ERR value is not an integer or out of range
get key3
$1
b

The SET command was processed because the INCR command was queued.

multi
+OK
set key3 c
+QUEUED
mybad key3 d
-ERR unknown command 'mybad', with args beginning with: 'key3' 'd'
exec
-EXECABORT Transaction discarded because of previous errors.
get key3
$1
b

The SET command wasn't processed because of the error during the queueing.

https://redis.io/docs/interact/transactions/#what-about-rollbacks

Redis does not support rollbacks of transactions since supporting rollbacks would have a significant impact on the simplicity and performance of Redis.

It's hard to validate them perfectly in advance on client side. It seems that Redis aims to prior simplicity and performance efficiency. So I think it's wrong to use the transaction feature by complex ways. To say nothing of the cluster mode because of the CAP theorem. Redis is just a key-value store.