How to import private key on testnet and verify balance of wallet? I have a python library to create wallets and play around with private key generation and stuff like that.

But i can't find any service / wallet - preferably online - where i could import my generated testnet-private-key and check the balance...

I can get coins thru Testnet Faucet and see the balance of an address on testnet via Blockcypher but where can i test importing private keys on the testnet?

EDIT: I don't really want to download the whole blockchain so some online service would really be great!
I wrote this python library since pybitcointools is no longer supported. You can check testnet balances like this (it pulls data from blockchain.info)

import os
os.environ['CRYPTOTOOLS_NETWORK'] = 'test'

from btctools import Address

address = Address('n2NGrooSecJaiD6ssp4YqFoj9eZ7GrCJ66')

&gt;&gt;&gt; address.balance()
0.55