test: implement 'bech32m' mode for `getnewdestination()` helper

test/functional/rpc_createmultisig.py

@@ -43,7 +43,7 @@ class RpcCreateMultiSigTest(BitcoinTestFramework):
         if self.is_bdb_compiled():
             self.final = node2.getnewaddress()
         else:
-            self.final = getnewdestination()[2]
+            self.final = getnewdestination('bech32')[2]
 
     def run_test(self):
         node0, node1, node2 = self.nodes
@@ -66,9 +66,7 @@ class RpcCreateMultiSigTest(BitcoinTestFramework):
 
         # Test mixed compressed and uncompressed pubkeys
         self.log.info('Mixed compressed and uncompressed multisigs are not allowed')
-        pk0 = getnewdestination()[0].hex()
-        pk1 = getnewdestination()[0].hex()
-        pk2 = getnewdestination()[0].hex()
+        pk0, pk1, pk2 = [getnewdestination('bech32')[0].hex() for _ in range(3)]
 
         # decompress pk2
         pk_obj = ECPubKey()

test/functional/test_framework/wallet.py

@@ -19,9 +19,13 @@ from test_framework.address import (
     key_to_p2pkh,
     key_to_p2sh_p2wpkh,
     key_to_p2wpkh,
+    output_key_to_p2tr,
 )
 from test_framework.descriptors import descsum_create
-from test_framework.key import ECKey
+from test_framework.key import (
+    ECKey,
+    compute_xonly_pubkey,
+)
 from test_framework.messages import (
     COIN,
     COutPoint,
@@ -38,6 +42,7 @@ from test_framework.script import (
     OP_NOP,
     OP_TRUE,
     SIGHASH_ALL,
+    taproot_construct,
 )
 from test_framework.script_util import (
     key_to_p2pk_script,
@@ -286,10 +291,10 @@ class MiniWallet:
         return txid
 
 
-def getnewdestination(address_type='bech32'):
+def getnewdestination(address_type='bech32m'):
     """Generate a random destination of the specified type and return the
        corresponding public key, scriptPubKey and address. Supported types are
-       'legacy', 'p2sh-segwit' and 'bech32'. Can be used when a random
+       'legacy', 'p2sh-segwit', 'bech32' and 'bech32m'. Can be used when a random
        destination is needed, but no compiled wallet is available (e.g. as
        replacement to the getnewaddress/getaddressinfo RPCs)."""
     key = ECKey()
@@ -304,7 +309,11 @@ def getnewdestination(address_type='bech32'):
     elif address_type == 'bech32':
         scriptpubkey = key_to_p2wpkh_script(pubkey)
         address = key_to_p2wpkh(pubkey)
-    # TODO: also support bech32m (need to generate x-only-pubkey)
+    elif address_type == 'bech32m':
+        tap = taproot_construct(compute_xonly_pubkey(key.get_bytes())[0])
+        pubkey = tap.output_pubkey
+        scriptpubkey = tap.scriptPubKey
+        address = output_key_to_p2tr(pubkey)
     else:
         assert False
     return pubkey, scriptpubkey, address