lnd.xprv/lnwallet/fee_estimator_test.go

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package lnwallet_test
import (
"testing"
"github.com/lightningnetwork/lnd/lnwallet"
"github.com/btcsuite/btcutil"
)
// TestFeeRateTypes checks that converting fee rates between the
// different types that represent fee rates and calculating fees
// work as expected.
func TestFeeRateTypes(t *testing.T) {
t.Parallel()
// Let our fee rate be 100 sat/vbyte.
feePerVSize := lnwallet.SatPerVByte(100)
// It is also equivalent to 25000 sat/kw.
feePerKw := feePerVSize.FeePerKWeight()
if feePerKw != 25000 {
t.Fatalf("expected %d sat/kw, got %d sat/kw", 25000,
feePerKw)
}
const txVSize = 300
// We'll now run through a set of values for the fee per vsize type,
// making sure the conversion to sat/kw and fee calculation is done
// correctly.
for f := lnwallet.SatPerVByte(0); f <= 40; f++ {
fPerKw := f.FeePerKWeight()
// The kw is always 250*vsize.
if fPerKw != lnwallet.SatPerKWeight(f*250) {
t.Fatalf("expected %d sat/kw, got %d sat/kw, when "+
"converting %d sat/vbyte", f*250, fPerKw, f)
}
// The tx fee should simply be f*txvsize.
fee := f.FeeForVSize(txVSize)
if fee != btcutil.Amount(f*txVSize) {
t.Fatalf("expected tx fee to be %d sat, was %d sat",
f*txVSize, fee)
}
// The weight is 4*vsize. Fee calculation from the fee/kw
// should result in the same fee.
fee2 := fPerKw.FeeForWeight(txVSize * 4)
if fee != fee2 {
t.Fatalf("fee calculated from vsize (%d) not equal "+
"fee calculated from weight (%d)", fee, fee2)
}
}
// Do the same for fee per kw.
for f := lnwallet.SatPerKWeight(0); f < 1500; f++ {
weight := int64(txVSize * 4)
// The expected fee is weight*f / 1000, since the fee is
// denominated per 1000 wu.
expFee := btcutil.Amount(weight) * btcutil.Amount(f) / 1000
fee := f.FeeForWeight(weight)
if fee != expFee {
t.Fatalf("expected fee to be %d sat, was %d",
fee, expFee)
}
}
}
// TestStaticFeeEstimator checks that the StaticFeeEstimator
// returns the expected fee rate.
func TestStaticFeeEstimator(t *testing.T) {
t.Parallel()
const feePerVSize = 100
feeEstimator := &lnwallet.StaticFeeEstimator{
FeeRate: feePerVSize,
}
if err := feeEstimator.Start(); err != nil {
t.Fatalf("unable to start fee estimator: %v", err)
}
defer feeEstimator.Stop()
feeRate, err := feeEstimator.EstimateFeePerVSize(6)
if err != nil {
t.Fatalf("unable to get fee rate: %v", err)
}
if feeRate != feePerVSize {
t.Fatalf("expected fee rate %v, got %v", feePerVSize, feeRate)
}
}