test: Create MiniWallet.create_self_transfer

test/functional/mempool_spend_coinbase.py

@@ -40,9 +40,10 @@ class MempoolSpendCoinbaseTest(BitcoinTestFramework):
         spend_101_id = wallet.send_self_transfer(from_node=self.nodes[0], utxo_to_spend=utxo_101)["txid"]
 
         # coinbase at height 102 should be too immature to spend
+        immature_tx = wallet.create_self_transfer(from_node=self.nodes[0], utxo_to_spend=utxo_102, mempool_valid=False)
         assert_raises_rpc_error(-26,
                                 "bad-txns-premature-spend-of-coinbase",
-                                lambda: wallet.send_self_transfer(from_node=self.nodes[0], utxo_to_spend=utxo_102))
+                                lambda: self.nodes[0].sendrawtransaction(immature_tx['hex']))
 
         # mempool should have just spend_101:
         assert_equal(self.nodes[0].getrawmempool(), [spend_101_id])
@@ -52,7 +53,7 @@ class MempoolSpendCoinbaseTest(BitcoinTestFramework):
         assert_equal(set(self.nodes[0].getrawmempool()), set())
 
         # ... and now height 102 can be spent:
-        spend_102_id = wallet.send_self_transfer(from_node=self.nodes[0], utxo_to_spend=utxo_102)["txid"]
+        spend_102_id = self.nodes[0].sendrawtransaction(immature_tx['hex'])
         assert_equal(self.nodes[0].getrawmempool(), [spend_102_id])
 
 

test/functional/test_framework/wallet.py

@@ -73,6 +73,12 @@ class MiniWallet:
 
     def send_self_transfer(self, *, fee_rate=Decimal("0.003"), from_node, utxo_to_spend=None):
         """Create and send a tx with the specified fee_rate. Fee may be exact or at most one satoshi higher than needed."""
+        tx = self.create_self_transfer(fee_rate=fee_rate, from_node=from_node, utxo_to_spend=utxo_to_spend)
+        self.sendrawtransaction(from_node=from_node, tx_hex=tx['hex'])
+        return tx
+
+    def create_self_transfer(self, *, fee_rate=Decimal("0.003"), from_node, utxo_to_spend=None, mempool_valid=True):
+        """Create and return a tx with the specified fee_rate. Fee may be exact or at most one satoshi higher than needed."""
         self._utxos = sorted(self._utxos, key=lambda k: k['value'])
         utxo_to_spend = utxo_to_spend or self._utxos.pop()  # Pick the largest utxo (if none provided) and hope it covers the fee
         vsize = Decimal(96)
@@ -88,7 +94,8 @@ class MiniWallet:
         tx_hex = tx.serialize().hex()
 
         tx_info = from_node.testmempoolaccept([tx_hex])[0]
-        self.sendrawtransaction(from_node=from_node, tx_hex=tx_hex)
+        assert_equal(mempool_valid, tx_info['allowed'])
+        if mempool_valid:
             assert_equal(tx_info['vsize'], vsize)
             assert_equal(tx_info['fees']['base'], fee)
         return {'txid': tx_info['txid'], 'wtxid': tx_info['wtxid'], 'hex': tx_hex}