test: Replace satoshi_round with int() or Decimal()

satoshi_round will round down. To make the code easier to parse use
Decimal() where possible, which does not round. Or use int(), which
explicitly rounds down.

test/functional/mempool_packages.py

@@ -14,7 +14,6 @@ from test_framework.util import (
     assert_equal,
     assert_raises_rpc_error,
     chain_transaction,
-    satoshi_round,
 )
 
 # default limits
@@ -209,10 +208,10 @@ class MempoolPackagesTest(BitcoinTestFramework):
             entry = self.nodes[0].getmempoolentry(x)
             descendant_fees += entry['fee']
             if (x == chain[-1]):
-                assert_equal(entry['modifiedfee'], entry['fee']+satoshi_round(0.00002))
-                assert_equal(entry['fees']['modified'], entry['fee']+satoshi_round(0.00002))
+                assert_equal(entry['modifiedfee'], entry['fee'] + Decimal("0.00002"))
+                assert_equal(entry['fees']['modified'], entry['fee'] + Decimal("0.00002"))
             assert_equal(entry['descendantfees'], descendant_fees * COIN + 2000)
-            assert_equal(entry['fees']['descendant'], descendant_fees+satoshi_round(0.00002))
+            assert_equal(entry['fees']['descendant'], descendant_fees + Decimal("0.00002"))
 
         # Check that node1's mempool is as expected (-> custom ancestor limit)
         mempool0 = self.nodes[0].getrawmempool(False)
@@ -308,7 +307,7 @@ class MempoolPackagesTest(BitcoinTestFramework):
         value = utxo[0]['amount']
         vout = utxo[0]['vout']
 
-        send_value = satoshi_round((value - fee)/2)
+        send_value = (value - fee) / 2
         inputs = [ {'txid' : txid, 'vout' : vout} ]
         outputs = {}
         for _ in range(2):