Update: The Cardano testnet has been replaced. If you held the old ADA_TEST before the replacement, your balances have now been reset.
The Cardano Foundation is discontinuing its support of the current Cardano test network, which will then be deprecated and replaced by a new testnet blockchain. The existing asset wallets in the current testnet will be recreated in the new testnet. The ADA_TEST asset ID, Symbol, and addresses will remain the same in the new testnet. The Cardano testnet wallet balances, however, will be reset. No action is required on your side.