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53 lines
1.6 KiB
Go
53 lines
1.6 KiB
Go
package utils
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import (
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"testing"
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"github.com/btcsuite/btcd/btcutil"
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"github.com/lightningnetwork/lnd/lntypes"
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"github.com/lightningnetwork/lnd/lnwallet/chainfee"
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"github.com/stretchr/testify/require"
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)
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// TestClampSweepFee verifies clamping still respects min relay fee
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// requirements and reports clamping.
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func TestClampSweepFee(t *testing.T) {
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weight := lntypes.WeightUnit(400)
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minRelay := chainfee.SatPerKWeight(253)
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total := btcutil.Amount(100_000)
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// Fee below the clamp threshold and above min relay should pass
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// through.
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fee := chainfee.SatPerKWeight(1_000).FeeForWeight(weight)
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clamped, clampedFlag, err := ClampSweepFee(
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fee, total, MaxFeeToAmountRatio, minRelay, weight,
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)
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require.NoError(t, err)
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require.Equal(t, fee, clamped)
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require.False(t, clampedFlag)
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// A clamped fee that would fall below min relay should error.
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// The fee will be clamped to 20 sats.
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fee = btcutil.Amount(10_000)
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total = btcutil.Amount(100)
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_, clampedFlag, err = ClampSweepFee(
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fee, total, MaxFeeToAmountRatio, minRelay, weight,
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)
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require.True(t, clampedFlag)
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require.Error(t, err)
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// A fee above the clamp threshold should be clamped without error when
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// still above min relay. The fee is 30% of total, will clamp to 20%.
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fee = btcutil.Amount(30_000)
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total = btcutil.Amount(100_000)
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clamped, clampedFlag, err = ClampSweepFee(
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fee, total, MaxFeeToAmountRatio, minRelay, weight,
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)
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require.NoError(t, err)
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require.True(t, clampedFlag)
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expectedClampedFee := btcutil.Amount(
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float64(total) * MaxFeeToAmountRatio,
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)
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require.Equal(t, expectedClampedFee, clamped)
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}
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