multi: add commitment v2 unit tests

Adds unit tests for the commitment v2 format.

Author: guggero

commitment/commitment_test.go

@@ -3,6 +3,7 @@ package commitment
 import (
 	"bytes"
 	"context"
+	"crypto/sha256"
 	"encoding/hex"
 	"math/rand"
 	"testing"
@@ -1483,7 +1484,9 @@ func TestIsTaprootAssetCommitmentScript(t *testing.T) {
 	t.Parallel()
 
 	require.True(t, IsTaprootAssetCommitmentScript(testTapCommitmentScript))
-	require.False(t, IsTaprootAssetCommitmentScript(TaprootAssetsMarker[:]))
+
+	tag := sha256.Sum256(markerV2)
+	require.False(t, IsTaprootAssetCommitmentScript(tag[:]))
 }
 
 // TestAssetCommitmentNoWitness tests that an asset commitment of a v1 asset is

commitment/tap_test.go

@@ -0,0 +1,79 @@
+package commitment
+
+import (
+	"crypto/sha256"
+	"testing"
+
+	"github.com/lightninglabs/taproot-assets/asset"
+	"github.com/lightninglabs/taproot-assets/fn"
+	"github.com/lightninglabs/taproot-assets/internal/test"
+	"github.com/stretchr/testify/require"
+)
+
+var (
+	// markerV2 is the marker tag for Taproot Assets used in V2 commitments.
+	markerV2 = []byte(taprootAssetsMarkerTag + ":194243")
+)
+
+// randTapCommitment generates a random Taproot commitment for the given
+// assetVersion.
+func randTapCommitment(t *testing.T, commitVersion *TapCommitmentVersion,
+	assetVersion asset.Version) *TapCommitment {
+
+	t.Helper()
+	randAssetType := test.RandFlip(asset.Normal, asset.Collectible)
+	randGenesis := asset.RandGenesis(t, randAssetType)
+	randAsset := randAsset(t, randGenesis, nil)
+
+	randAsset.Version = assetVersion
+
+	tapCommitment, err := FromAssets(commitVersion, randAsset)
+	require.NoError(t, err)
+
+	return tapCommitment
+}
+
+// TestTaprootAssetsMarkerV0 tests if it can find the TaprootAssetsMarker V0 at
+// the correct spot according to the legacy MarkerV0 digest with assetVersion 0
+// and 1.
+func TestTaprootAssetsMarkerV0(t *testing.T) {
+	t.Parallel()
+
+	assetVersions := []asset.Version{asset.V0, asset.V1}
+	for _, assetVersion := range assetVersions {
+		// Create a random Taproot commitment, and extract the tapLeaf
+		// script.
+		randTapCommitment := randTapCommitment(t, nil, assetVersion)
+		tapLeaf := randTapCommitment.TapLeaf()
+		script := tapLeaf.Script
+
+		require.Equal(t, byte(assetVersion), script[0])
+		require.Equal(t, TaprootAssetsMarker[:], script[1:33])
+	}
+}
+
+// TestTaprootAssetsMarkerV1 tests if it can find the TaprootAssetsMarker V2 at
+// the correct spot according to the MarkerV1 digest with assetVersion 0 and 1.
+func TestTaprootAssetsMarkerV1(t *testing.T) {
+	t.Parallel()
+
+	assetVersions := []asset.Version{asset.V0, asset.V1}
+	for _, assetVersion := range assetVersions {
+		// Create a random Taproot commitment, and extract the tapLeaf
+		// script.
+		randTapCommitment := randTapCommitment(
+			t, fn.Ptr(TapCommitmentV2), assetVersion,
+		)
+
+		// Check if MarkerVersion is set to MarkerV2, which should be
+		// the default.
+		require.Equal(t, randTapCommitment.Version, TapCommitmentV2)
+
+		tapLeaf := randTapCommitment.TapLeaf()
+		script := tapLeaf.Script
+
+		tag := sha256.Sum256(markerV2)
+		require.Equal(t, tag[:], script[:32])
+		require.Equal(t, byte(TapCommitmentV2), script[32])
+	}
+}

commitment/taproot_test.go

@@ -2,6 +2,7 @@ package commitment
 
 import (
 	"bytes"
+	"crypto/sha256"
 	"encoding/binary"
 	"encoding/hex"
 	"testing"
@@ -38,14 +39,26 @@ func TestTapscriptPreimage(t *testing.T) {
 
 	// Create a random byte slice with the same structure as a Taproot
 	// Asset commitment root, that can be used in a TapLeaf.
-	randTapCommitmentRoot := func(version asset.Version) []byte {
+
+	randTapCommitmentRoot := func(version asset.Version,
+		legacyCommitment bool) []byte {
+
 		var dummyRootSum [8]byte
 		binary.BigEndian.PutUint64(
 			dummyRootSum[:], test.RandInt[uint64](),
 		)
-		dummyRootHashParts := [][]byte{
-			{byte(version)}, TaprootAssetsMarker[:],
-			fn.ByteSlice(test.RandHash()), dummyRootSum[:],
+		var dummyRootHashParts [][]byte
+		if legacyCommitment {
+			dummyRootHashParts = [][]byte{
+				{byte(version)}, TaprootAssetsMarker[:],
+				fn.ByteSlice(test.RandHash()), dummyRootSum[:],
+			}
+		} else {
+			tag := sha256.Sum256(markerV2)
+			dummyRootHashParts = [][]byte{
+				tag[:], {byte(version)},
+				fn.ByteSlice(test.RandHash()), dummyRootSum[:],
+			}
 		}
 		return bytes.Join(dummyRootHashParts, nil)
 	}
@@ -115,7 +128,33 @@ func TestTapscriptPreimage(t *testing.T) {
 	}, {
 		name: "tap commitment leaf pre-image",
 		makePreimage: func(t *testing.T) *TapscriptPreimage {
-			tapCommitmentRoot := randTapCommitmentRoot(asset.V0)
+			tapCommitmentRoot := randTapCommitmentRoot(
+				asset.V0, false,
+			)
+			var encodedLeaf bytes.Buffer
+
+			_ = encodedLeaf.WriteByte(
+				byte(txscript.BaseLeafVersion),
+			)
+			_ = wire.WriteVarBytes(
+				&encodedLeaf, 0, tapCommitmentRoot,
+			)
+
+			return &TapscriptPreimage{
+				siblingType:     LeafPreimage,
+				siblingPreimage: encodedLeaf.Bytes(),
+			}
+		},
+		expectedType:    LeafPreimage,
+		expectedName:    "LeafPreimage",
+		expectedEmpty:   false,
+		expectedHashErr: ErrPreimageIsTapCommitment.Error(),
+	}, {
+		name: "tap commitment leaf pre-image legacy commitment",
+		makePreimage: func(t *testing.T) *TapscriptPreimage {
+			tapCommitmentRoot := randTapCommitmentRoot(
+				asset.V0, true,
+			)
 			var encodedLeaf bytes.Buffer
 
 			_ = encodedLeaf.WriteByte(

itest/multisig.go

@@ -501,6 +501,9 @@ type publishAndLogTransferOptions struct {
 
 	// label is the label to use for the transfer.
 	label string
+
+	// expectedErr is the expected error when calling PublishAndLogTransfer.
+	expectedErr string
 }
 
 // defaultPublishAndLogTransferOptions returns the default options for
@@ -525,6 +528,14 @@ func withLabel(label string) PublishAndLogTransferOption {
 	}
 }
 
+// withExpectedErr is an option for PublishAndLogTransfer that sets the
+// expected error.
+func withExpectedErr(expectedErr string) PublishAndLogTransferOption {
+	return func(opts *publishAndLogTransferOptions) {
+		opts.expectedErr = expectedErr
+	}
+}
+
 // PublishAndLogTransfer is a helper function that invokes the
 // PublishAndLogTransfer RPC endpoint on the specified tapd node. This endpoint
 // performs a pre-anchored transfer.
@@ -572,7 +583,15 @@ func PublishAndLogTransfer(t *testing.T, tapd commands.RpcClientsBundle,
 	}
 
 	resp, err := tapd.PublishAndLogTransfer(ctxt, request)
-	require.NoError(t, err)
+
+	if options.expectedErr != "" {
+		require.Error(t, err)
+		require.Contains(t, err.Error(), options.expectedErr,
+			"unexpected error: %v", err)
+		return nil
+	} else {
+		require.NoError(t, err)
+	}
 
 	return resp
 }