test: Call ceildiv helper with integer

mzumsande · fanquake · commit 269553fe73b1 · 2022-02-15T09:22:06.000Z
It returns an incorrect result when called with a Decimal, for which the "//" operator works differently. Also drop unnecessary call to satoshi_round. Github-Pull: #24239 Rebased-From: d1fab9d
diff --git a/test/functional/test_framework/util.py b/test/functional/test_framework/util.py
@@ -37,6 +37,7 @@ def assert_approx(v, vexp, vspan=0.00001):
 
 def assert_fee_amount(fee, tx_size, feerate_BTC_kvB):
     """Assert the fee is in range."""
+    assert isinstance(tx_size, int)
     target_fee = get_fee(tx_size, feerate_BTC_kvB)
     if fee < target_fee:
         raise AssertionError("Fee of %s BTC too low! (Should be %s BTC)" % (str(fee), str(target_fee)))
@@ -224,15 +225,21 @@ def str_to_b64str(string):
 
 
 def ceildiv(a, b):
-    """Divide 2 ints and round up to next int rather than round down"""
+    """
+    Divide 2 ints and round up to next int rather than round down
+    Implementation requires python integers, which have a // operator that does floor division.
+    Other types like decimal.Decimal whose // operator truncates towards 0 will not work.
+    """
+    assert isinstance(a, int)
+    assert isinstance(b, int)
     return -(-a // b)
 
 
 def get_fee(tx_size, feerate_btc_kvb):
     """Calculate the fee in BTC given a feerate is BTC/kvB. Reflects CFeeRate::GetFee"""
     feerate_sat_kvb = int(feerate_btc_kvb * Decimal(1e8)) # Fee in sat/kvb as an int to avoid float precision errors
     target_fee_sat = ceildiv(feerate_sat_kvb * tx_size, 1000) # Round calculated fee up to nearest sat
-    return satoshi_round(target_fee_sat / Decimal(1e8)) # Truncate BTC result to nearest sat
+    return target_fee_sat / Decimal(1e8) # Return result in  BTC
 
 
 def satoshi_round(amount):
diff --git a/test/functional/wallet_send.py b/test/functional/wallet_send.py
@@ -15,6 +15,7 @@
     assert_fee_amount,
     assert_greater_than,
     assert_raises_rpc_error,
+    count_bytes,
 )
 
 class WalletSendTest(BitcoinTestFramework):
@@ -318,20 +319,20 @@ def run_test(self):
 
         res = self.test_send(from_wallet=w0, to_wallet=w1, amount=1, fee_rate=7, add_to_wallet=False)
         fee = self.nodes[1].decodepsbt(res["psbt"])["fee"]
-        assert_fee_amount(fee, Decimal(len(res["hex"]) / 2), Decimal("0.00007"))
+        assert_fee_amount(fee, count_bytes(res["hex"]), Decimal("0.00007"))
 
         # "unset" and None are treated the same for estimate_mode
         res = self.test_send(from_wallet=w0, to_wallet=w1, amount=1, fee_rate=2, estimate_mode="unset", add_to_wallet=False)
         fee = self.nodes[1].decodepsbt(res["psbt"])["fee"]
-        assert_fee_amount(fee, Decimal(len(res["hex"]) / 2), Decimal("0.00002"))
+        assert_fee_amount(fee, count_bytes(res["hex"]), Decimal("0.00002"))
 
         res = self.test_send(from_wallet=w0, to_wallet=w1, amount=1, arg_fee_rate=4.531, add_to_wallet=False)
         fee = self.nodes[1].decodepsbt(res["psbt"])["fee"]
-        assert_fee_amount(fee, Decimal(len(res["hex"]) / 2), Decimal("0.00004531"))
+        assert_fee_amount(fee, count_bytes(res["hex"]), Decimal("0.00004531"))
 
         res = self.test_send(from_wallet=w0, to_wallet=w1, amount=1, arg_fee_rate=3, add_to_wallet=False)
         fee = self.nodes[1].decodepsbt(res["psbt"])["fee"]
-        assert_fee_amount(fee, Decimal(len(res["hex"]) / 2), Decimal("0.00003"))
+        assert_fee_amount(fee, count_bytes(res["hex"]), Decimal("0.00003"))
 
         # Test that passing fee_rate as both an argument and an option raises.
         self.test_send(from_wallet=w0, to_wallet=w1, amount=1, arg_fee_rate=1, fee_rate=1, add_to_wallet=False,
