80 lines
2.2 KiB
Go
80 lines
2.2 KiB
Go
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package sweep
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import (
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"testing"
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"github.com/btcsuite/btcd/wire"
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"github.com/lightningnetwork/lnd/input"
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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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// TestWeightEstimator tests weight estimation for inputs with and without
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// unconfirmed parents.
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func TestWeightEstimator(t *testing.T) {
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testFeeRate := chainfee.SatPerKWeight(20000)
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w := newWeightEstimator(testFeeRate)
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// Add an input without unconfirmed parent tx.
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input1 := input.MakeBaseInput(
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&wire.OutPoint{}, input.CommitmentAnchor,
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&input.SignDescriptor{}, 0, nil,
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)
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require.NoError(t, w.add(&input1))
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// The expectations is that this input is added.
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const expectedWeight1 = 322
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require.Equal(t, expectedWeight1, w.weight())
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require.Equal(t, testFeeRate.FeeForWeight(expectedWeight1), w.fee())
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// Define a parent transaction that pays a fee of 30000 sat/kw.
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parentTxHighFee := &input.TxInfo{
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Weight: 100,
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Fee: 3000,
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}
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// Add an output of the parent tx above.
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input2 := input.MakeBaseInput(
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&wire.OutPoint{}, input.CommitmentAnchor,
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&input.SignDescriptor{}, 0,
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parentTxHighFee,
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)
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require.NoError(t, w.add(&input2))
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// Pay for parent isn't possible because the parent pays a higher fee
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// rate than the child. We expect no additional fee on the child.
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const expectedWeight2 = expectedWeight1 + 280
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require.Equal(t, expectedWeight2, w.weight())
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require.Equal(t, testFeeRate.FeeForWeight(expectedWeight2), w.fee())
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// Define a parent transaction that pays a fee of 10000 sat/kw.
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parentTxLowFee := &input.TxInfo{
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Weight: 100,
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Fee: 1000,
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}
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// Add an output of the low-fee parent tx above.
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input3 := input.MakeBaseInput(
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&wire.OutPoint{}, input.CommitmentAnchor,
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&input.SignDescriptor{}, 0,
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parentTxLowFee,
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)
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require.NoError(t, w.add(&input3))
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// Expect the weight to increase because of the third input.
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const expectedWeight3 = expectedWeight2 + 280
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require.Equal(t, expectedWeight3, w.weight())
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// Expect the fee to cover the child and the parent transaction at 20
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// sat/kw after subtraction of the fee that was already paid by the
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// parent.
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expectedFee := testFeeRate.FeeForWeight(
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expectedWeight3+parentTxLowFee.Weight,
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) - parentTxLowFee.Fee
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require.Equal(t, expectedFee, w.fee())
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}
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