diff options
| -rw-r--r-- | test/functional/test_framework/util.py | 21 |
1 files changed, 17 insertions, 4 deletions
diff --git a/test/functional/test_framework/util.py b/test/functional/test_framework/util.py index 35dbfbba8d..72fd83e3f7 100644 --- a/test/functional/test_framework/util.py +++ b/test/functional/test_framework/util.py @@ -35,13 +35,14 @@ def assert_approx(v, vexp, vspan=0.00001): raise AssertionError("%s > [%s..%s]" % (str(v), str(vexp - vspan), str(vexp + vspan))) -def assert_fee_amount(fee, tx_size, fee_per_kB): - """Assert the fee was in range""" - target_fee = round(tx_size * fee_per_kB / 1000, 8) +def assert_fee_amount(fee, tx_size, feerate_BTC_kvB): + """Assert the fee is in range.""" + 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))) # allow the wallet's estimation to be at most 2 bytes off - if fee > (tx_size + 2) * fee_per_kB / 1000: + high_fee = get_fee(tx_size + 2, feerate_BTC_kvB) + if fee > high_fee: raise AssertionError("Fee of %s BTC too high! (Should be %s BTC)" % (str(fee), str(target_fee))) @@ -222,6 +223,18 @@ def str_to_b64str(string): return b64encode(string.encode('utf-8')).decode('ascii') +def ceildiv(a, b): + """Divide 2 ints and round up to next int rather than round down""" + 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 + + def satoshi_round(amount): return Decimal(amount).quantize(Decimal('0.00000001'), rounding=ROUND_DOWN) |