def test_purge_block(mock_client):
watch_only_wallet = WatchOnlyWallet()
controller = MainController(watch_only_wallet)
controller.blockchain_client = mock_client
watch_only_wallet.load(*WalletFile.load())
controller._sync_to_blockchain()
watch_only_wallet.refresh_balances()
# Tx_ins from the orphaned block should not show up in our balance
assert watch_only_wallet.spendable_balance_satoshis == 0
assert watch_only_wallet.incoming_balance_satoshis == 888
# Current block should be the most recent valid block
assert watch_only_wallet.current_block == valid_block_4
# Addresses that received a tx_in in an orphaned block should count as fresh
assert list(watch_only_wallet.external_addresses.values())[0].is_fresh
