Fix for Bitcoin Core v23 and framework improvements

tests/functional/inc.setup.sh

@@ -1,17 +1,30 @@
 # shellcheck shell=bash
 
-bitcoin_args="-regtest"
-bitcoind="bitcoind $bitcoin_args -fallbackfee=0.0002"
-bitcoin_cli="bitcoin-cli $bitcoin_args"
+bitcoin_test_datadir="$(mktemp)"
+bitcoin_args=(
+    "-regtest"
+    "-datadir=$bitcoin_test_datadir"
+)
+bitcoind="bitcoind ${bitcoin_args[*]} -fallbackfee=0.0002"
+bitcoin_cli="bitcoin-cli ${bitcoin_args[*]}"
 
 # shellcheck disable=SC2034
 retval=0
 
+#set -x
+
+rm -rf "$bitcoin_test_datadir"
+mkdir "$bitcoin_test_datadir"
+echo -e "[regtest]\nrpcuser=bitcoinrpc\nrpcpassword=123456abcdef" \
+    > "$bitcoin_test_datadir/bitcoin.conf"
 $bitcoind -daemon || exit 1
 # Wait until bitcoind has started properly
-while ! $bitcoin_cli getblockchaininfo &> /dev/null; do sleep 0.1; done
-# Create and load wallet
-$bitcoin_cli createwallet tests &> /dev/null
+while ! $bitcoin_cli getblockchaininfo 2> /dev/null; do sleep 0.1; done
+# Create and load wallet (descriptor wallets aren't supported yet)
+if ! $bitcoin_cli -named createwallet wallet_name=tests descriptors=false; then
+    # fallback for old Core versions
+    $bitcoin_cli createwallet tests
+fi
 $bitcoin_cli loadwallet tests
 # Generate some coins
 $bitcoin_cli generatetoaddress 1 "$($bitcoin_cli getnewaddress "" "legacy")"