From 187e3b89b54203e850fb15d4dd5e7124704c5cfd Mon Sep 17 00:00:00 2001
From: glozow <gloriajzhao@gmail.com>
Date: Thu, 2 Oct 2025 16:11:47 -0400
Subject: [PATCH] [test] wallet send 3 generation TRUC

Github-Pull: #33528
Rebased-From: dcd42d6d8f160ae8bc12c152099a6e6473658e30
---
 test/functional/wallet_v3_txs.py | 45 ++++++++++++++++++++++++++++++++
 1 file changed, 45 insertions(+)

diff --git a/test/functional/wallet_v3_txs.py b/test/functional/wallet_v3_txs.py
index db9f1483aba..a037c1bc124 100755
--- a/test/functional/wallet_v3_txs.py
+++ b/test/functional/wallet_v3_txs.py
@@ -119,6 +119,7 @@ class WalletV3Test(BitcoinTestFramework):
         self.sendall_truc_child_weight_limit()
         self.mix_non_truc_versions()
         self.cant_spend_multiple_unconfirmed_truc_outputs()
+        self.test_spend_third_generation()
 
     @cleanup
     def tx_spends_unconfirmed_tx_with_wrong_version(self, version_a, version_b):
@@ -585,5 +586,49 @@ class WalletV3Test(BitcoinTestFramework):
                 {'include_unsafe' : True}
         )
 
+    @cleanup
+    def test_spend_third_generation(self):
+        self.log.info("Test that we can't spend an unconfirmed TRUC output that already has an unconfirmed parent")
+
+        # Generation 1: Consolidate all UTXOs into one output using sendall
+        self.charlie.sendall([self.charlie.getnewaddress()], version=3)
+        outputs1 = self.charlie.listunspent(minconf=0)
+        assert_equal(len(outputs1), 1)
+
+        # Generation 2: to ensure no change address is created, do another sendall
+        self.charlie.sendall([self.charlie.getnewaddress()], version=3)
+        outputs2 = self.charlie.listunspent(minconf=0)
+        assert_equal(len(outputs2), 1)
+        total_amount = sum([utxo['amount'] for utxo in outputs2])
+
+        # Generation 3: try to send half of total amount to Alice
+        outputs = {self.alice.getnewaddress(): total_amount / 2}
+        assert_raises_rpc_error(
+                -4,
+                "Insufficient funds",
+                self.charlie.send,
+                outputs,
+                version=3
+        )
+
+        # Also doesn't work with fundrawtransaction
+        raw_tx = self.charlie.createrawtransaction(inputs=[], outputs=outputs, version=3)
+        assert_raises_rpc_error(
+                -4,
+                "Insufficient funds",
+                self.charlie.fundrawtransaction,
+                raw_tx,
+                {'include_unsafe' : True}
+        )
+
+        # Also doesn't work with sendall
+        assert_raises_rpc_error(
+                -6,
+                "Total value of UTXO pool too low to pay for transaction",
+                self.charlie.sendall,
+                [self.alice.getnewaddress()],
+                version=3
+        )
+
 if __name__ == '__main__':
     WalletV3Test(__file__).main()