1 files changed, 18 insertions, 6 deletions
diff --git a/qa/rpc-tests/test_framework/util.py b/qa/rpc-tests/test_framework/util.py
index 99c30f7651..85898d9f32 100644
--- a/qa/rpc-tests/test_framework/util.py
+++ b/qa/rpc-tests/test_framework/util.py
@@ -654,16 +654,15 @@ def create_tx(node, coinbase, to_address, amount):
 
 # Create a spend of each passed-in utxo, splicing in "txouts" to each raw
 # transaction to make it large.  See gen_return_txouts() above.
-def create_lots_of_big_transactions(node, txouts, utxos, fee):
+def create_lots_of_big_transactions(node, txouts, utxos, num, fee):
     addr = node.getnewaddress()
     txids = []
-    for i in range(len(utxos)):
+    for _ in range(num):
         t = utxos.pop()
-        inputs = []
-        inputs.append({ "txid" : t["txid"], "vout" : t["vout"]})
+        inputs=[{ "txid" : t["txid"], "vout" : t["vout"]}]
         outputs = {}
-        send_value = t['amount'] - fee
-        outputs[addr] = satoshi_round(send_value)
+        change = t['amount'] - fee
+        outputs[addr] = satoshi_round(change)
         rawtx = node.createrawtransaction(inputs, outputs)
         newtx = rawtx[0:92]
         newtx = newtx + txouts
@@ -673,6 +672,19 @@ def create_lots_of_big_transactions(node, txouts, utxos, fee):
         txids.append(txid)
     return txids
 
+def mine_large_block(node, utxos=None):
+    # generate a 66k transaction,
+    # and 14 of them is close to the 1MB block limit
+    num = 14
+    txouts = gen_return_txouts()
+    utxos = utxos if utxos is not None else []
+    if len(utxos) < num:
+        utxos.clear()
+        utxos.extend(node.listunspent())
+    fee = 100 * node.getnetworkinfo()["relayfee"]
+    create_lots_of_big_transactions(node, txouts, utxos, num, fee=fee)
+    node.generate(1)
+
 def get_bip9_status(node, key):
     info = node.getblockchaininfo()
     return info['bip9_softforks'][key]