test: fix feature_tapscript_opcodes.py

The first transaction from create_taproot_utxo was failing with
bad-txns-inputs-missingorspent because the "input" selected with
fundrawtransaction was the anyonecanspend initialfreecoins.

Fixed by first spending the initialfreecoins to "real" outputs.

Author: delta1

test/functional/feature_tapscript_opcodes.py

@@ -96,7 +96,7 @@ def create_taproot_utxo(self, scripts = None, blind = False):
         self.nodes[0].sendrawtransaction(signed_raw_tx['hex'])
         tx = tx_from_hex(signed_raw_tx['hex'])
         tx.rehash()
-        self.nodes[0].generate(1)
+        self.generate(self.nodes[0], 1)
         last_blk = self.nodes[0].getblock(self.nodes[0].getbestblockhash())
         assert(tx.hash in last_blk['tx'])
 
@@ -118,7 +118,7 @@ def tapscript_satisfy_test(self, script, inputs = None, add_issuance = False,
             peg_id = self.nodes[0].sendtoaddress(fund_info["mainchain_address"], 1)
             raw_peg_tx = self.nodes[0].gettransaction(peg_id)["hex"]
             peg_txid = self.nodes[0].sendrawtransaction(raw_peg_tx)
-            self.nodes[0].generate(101)
+            self.generate(self.nodes[0], 101)
             peg_prf = self.nodes[0].gettxoutproof([peg_txid])
             claim_script = fund_info["claim_script"]
 
@@ -249,15 +249,19 @@ def tapscript_satisfy_test(self, script, inputs = None, add_issuance = False,
 
 
         self.nodes[0].sendrawtransaction(hexstring = tx.serialize().hex())
-        self.nodes[0].generate(1)
+        self.generate(self.nodes[0], 1)
         last_blk = self.nodes[0].getblock(self.nodes[0].getbestblockhash())
         tx.rehash()
         assert(tx.hash in last_blk['tx'])
 
 
     def run_test(self):
-        self.nodes[0].generate(101)
+        self.generate(self.nodes[0], 101)
         self.wait_until(lambda: self.nodes[0].getblockcount() == 101, timeout=5)
+        # spend the initialfreecoins to node0, to fix bad-txns-inputs-missingorspent error when creating the first taproot utxo
+        self.nodes[0].sendtoaddress(self.nodes[0].getnewaddress(), 50)
+        self.generate(self.nodes[0], 1)
+
         # Test whether the above test framework is working
         self.log.info("Test simple op_1")
         self.tapscript_satisfy_test(CScript([OP_1]))

test/functional/test_runner.py

@@ -145,7 +145,7 @@
     'wallet_signer.py --descriptors',
     # ELEMENTS: FIXME failing tests
     # 'feature_taphash_pegins_issuances.py',
-    # 'feature_tapscript_opcodes.py',
+    'feature_tapscript_opcodes.py',
     # vv Tests less than 60s vv
     'p2p_sendheaders.py',
     'wallet_importmulti.py --legacy-wallet',