Merge bitcoin/bitcoin#30226: test: add validation for gettxout RPC response

723440c5b8 test framework, wallet: rename get_scriptPubKey method to get_output_script (Alfonso Roman Zubeldia)
fa0232a3e0 test: add validation for gettxout RPC response (Alfonso Roman Zubeldia)

Pull request description:

  Added a new test in `test/functional/rpc_blockchain.py` to validate the gettxout RPC response. This new test ensures all response elements are verified, including `bestblock`, `confirmations`, `value`, `coinbase`, and `scriptPubKey` details.

  Also renamed the method `get_scriptPubKey` from `test/functional/test_framework/wallet.py` to the modern name `get_output_script` as suggested by maflcko (https://github.com/bitcoin/bitcoin/pull/30226#discussion_r1925491846)

ACKs for top commit:
  fjahr:
    reACK 723440c5b8
  maflcko:
    lgtm ACK 723440c5b8
  brunoerg:
    code review ACK 723440c5b8

Tree-SHA512: 3384578909d2e7548cef302c5b8a9fed5b82dfc942892503ad4a05e73f5cceafad1eab3af9a27e54aef3db7631f8935298d6b882c70d2f02a9a75b8e3c209b6c

test/functional/feature_coinstatsindex.py

@@ -151,7 +151,7 @@ class CoinStatsIndexTest(BitcoinTestFramework):
         # Generate and send a normal tx with two outputs
         tx1 = self.wallet.send_to(
             from_node=node,
-            scriptPubKey=self.wallet.get_scriptPubKey(),
+            scriptPubKey=self.wallet.get_output_script(),
             amount=21 * COIN,
         )
 

test/functional/feature_framework_miniwallet.py

@@ -44,7 +44,7 @@ class FeatureFrameworkMiniWalletTest(BitcoinTestFramework):
             tag = ''.join(random.choice(string.ascii_letters) for _ in range(20))
             self.log.debug(f"-> ({i}) tag name: {tag}")
             tagged_wallet = MiniWallet(node, tag_name=tag)
-            untagged_wallet.send_to(from_node=node, scriptPubKey=tagged_wallet.get_scriptPubKey(), amount=100000)
+            untagged_wallet.send_to(from_node=node, scriptPubKey=tagged_wallet.get_output_script(), amount=100000)
             tagged_wallet.rescan_utxos()
             tagged_wallet.send_self_transfer(from_node=node)
         self.generate(node, 1)  # clear mempool

test/functional/feature_rbf.py

@@ -85,7 +85,7 @@ class ReplaceByFeeTest(BitcoinTestFramework):
         confirmed - txout created will be confirmed in the blockchain;
                     unconfirmed otherwise.
         """
-        tx = self.wallet.send_to(from_node=node, scriptPubKey=scriptPubKey or self.wallet.get_scriptPubKey(), amount=amount)
+        tx = self.wallet.send_to(from_node=node, scriptPubKey=scriptPubKey or self.wallet.get_output_script(), amount=amount)
 
         if confirmed:
             mempool_size = len(node.getrawmempool())

test/functional/rpc_blockchain.py

@@ -9,6 +9,7 @@ Test the following RPCs:
     - getdeploymentinfo
     - getchaintxstats
     - gettxoutsetinfo
+    - gettxout
     - getblockheader
     - getdifficulty
     - getnetworkhashps
@@ -90,6 +91,7 @@ class BlockchainTest(BitcoinTestFramework):
         self._test_getblockchaininfo()
         self._test_getchaintxstats()
         self._test_gettxoutsetinfo()
+        self._test_gettxout()
         self._test_getblockheader()
         self._test_getdifficulty()
         self._test_getnetworkhashps()
@@ -400,6 +402,33 @@ class BlockchainTest(BitcoinTestFramework):
         # Unknown hash_type raises an error
         assert_raises_rpc_error(-8, "'foo hash' is not a valid hash_type", node.gettxoutsetinfo, "foo hash")
 
+    def _test_gettxout(self):
+        self.log.info("Validating gettxout RPC response")
+        node = self.nodes[0]
+
+        # Get the best block hash and the block, which
+        # should only include the coinbase transaction.
+        best_block_hash = node.getbestblockhash()
+        block = node.getblock(best_block_hash)
+        assert_equal(block['nTx'], 1)
+
+        # Get the transaction ID of the coinbase tx and
+        # the transaction output.
+        txid = block['tx'][0]
+        txout = node.gettxout(txid, 0)
+
+        # Validate the gettxout response
+        assert_equal(txout['bestblock'], best_block_hash)
+        assert_equal(txout['confirmations'], 1)
+        assert_equal(txout['value'], 25)
+        assert_equal(txout['scriptPubKey']['address'], self.wallet.get_address())
+        assert_equal(txout['scriptPubKey']['hex'], self.wallet.get_output_script().hex())
+        decoded_script = node.decodescript(self.wallet.get_output_script().hex())
+        assert_equal(txout['scriptPubKey']['asm'], decoded_script['asm'])
+        assert_equal(txout['scriptPubKey']['desc'], decoded_script['desc'])
+        assert_equal(txout['scriptPubKey']['type'], decoded_script['type'])
+        assert_equal(txout['coinbase'], True)
+
     def _test_getblockheader(self):
         self.log.info("Test getblockheader")
         node = self.nodes[0]

test/functional/test_framework/wallet.py

@@ -215,7 +215,7 @@ class MiniWallet:
         self.rescan_utxos()
         return blocks
 
-    def get_scriptPubKey(self):
+    def get_output_script(self):
         return self._scriptPubKey
 
     def get_descriptor(self):