test: refactor: use create_lots_of_big_transactions to dedup where possible

test/functional/mempool_limit.py

@@ -7,12 +7,12 @@
 from decimal import Decimal
 
 from test_framework.blocktools import COINBASE_MATURITY
-from test_framework.messages import COIN
 from test_framework.test_framework import BitcoinTestFramework
 from test_framework.util import (
     assert_equal,
     assert_greater_than,
     assert_raises_rpc_error,
+    create_lots_of_big_transactions,
     gen_return_txouts,
 )
 from test_framework.wallet import MiniWallet
@@ -29,16 +29,6 @@ class MempoolLimitTest(BitcoinTestFramework):
         ]]
         self.supports_cli = False
 
-    def send_large_txs(self, node, miniwallet, txouts, fee, tx_batch_size):
-        for _ in range(tx_batch_size):
-            tx = miniwallet.create_self_transfer(from_node=node, fee_rate=0, mempool_valid=False)['tx']
-            for txout in txouts:
-                tx.vout.append(txout)
-            tx.vout[0].nValue -= int(fee * COIN)
-            res = node.testmempoolaccept([tx.serialize().hex()])[0]
-            assert_equal(res['fees']['base'], fee)
-            miniwallet.sendrawtransaction(from_node=node, tx_hex=tx.serialize().hex())
-
     def run_test(self):
         txouts = gen_return_txouts()
         node = self.nodes[0]
@@ -71,7 +61,7 @@ class MempoolLimitTest(BitcoinTestFramework):
         self.log.info("Fill up the mempool with txs with higher fee rate")
         for batch_of_txid in range(num_of_batches):
             fee = (batch_of_txid + 1) * base_fee
-            self.send_large_txs(node, miniwallet, txouts, fee, tx_batch_size)
+            create_lots_of_big_transactions(miniwallet, node, fee, tx_batch_size, txouts)
 
         self.log.info('The tx should be evicted by now')
         # The number of transactions created should be greater than the ones present in the mempool