Replace hard-coded constant in test

Author: l0rinc

test/functional/mempool_accept.py

@@ -18,6 +18,7 @@
     CTxInWitness,
     CTxOut,
     MAX_BLOCK_WEIGHT,
+    WITNESS_SCALE_FACTOR,
     MAX_MONEY,
     SEQUENCE_FINAL,
     tx_from_hex,
@@ -228,7 +229,7 @@ def run_test(self):
 
         self.log.info('A really large transaction')
         tx = tx_from_hex(raw_tx_reference)
-        tx.vin = [tx.vin[0]] * math.ceil(MAX_BLOCK_WEIGHT // 4 / len(tx.vin[0].serialize()))
+        tx.vin = [tx.vin[0]] * math.ceil((MAX_BLOCK_WEIGHT // WITNESS_SCALE_FACTOR) / len(tx.vin[0].serialize()))
         self.check_mempool_result(
             result_expected=[{'txid': tx.rehash(), 'allowed': False, 'reject-reason': 'bad-txns-oversize'}],
             rawtxs=[tx.serialize().hex()],