internal: extend committee for unit tests

Committee should differ from the set of validators, to catch
possible bugs during testing.

config/protocol.unit_testnet.yml

@@ -7,6 +7,8 @@ ProtocolConfiguration:
     - 02103a7f7dd016558597f7960d27c516a4394fd968b9e65155eb4b013e4040406e
     - 03d90c07df63e690ce77912e10ab51acc944b66860237b608c4f8f8309e71ee699
     - 02a7bc55fe8684e0119768d104ba30795bdcc86619e864add26156723ed185cd62
+    - 02c429b3ea1aa486cb2edfd6e99d8055c1f81f1a9206664e2c40a586d187257557
+    - 02c4de32252c50fa171dbe25379e4e2d55cdc12f69e382c39f59a44573ecff2f9d
   ValidatorsCount: 4
   SeedList:
     - 127.0.0.1:20334

pkg/internal/testchain/address.go

@@ -23,18 +23,31 @@ var privNetKeys = []string{
 	"KzgWE3u3EDp13XPXXuTKZxeJ3Gi8Bsm8f9ijY3ZsCKKRvZUo1Cdn",
 	"KxyjQ8eUa4FHt3Gvioyt1Wz29cTUrE4eTqX3yFSk1YFCsPL8uNsY",
 	"L2oEXKRAAMiPEZukwR5ho2S6SMeQLhcK9mF71ZnF7GvT8dU4Kkgz",
+
+	// Provide 2 committee extra members so that committee address differs from
+	// the validators one.
+	"L1Tr1iq5oz1jaFaMXP21sHDkJYDDkuLtpvQ4wRf1cjKvJYvnvpAb",
+	"Kz6XTUrExy78q8f4MjDHnwz8fYYyUE8iPXwPRAkHa3qN2JcHYm7e",
 }
 
+// ValidatorsCount returns number of validators in the testchain.
+const ValidatorsCount = 4
+
 var (
 	// ids maps validators order by public key sorting to validators ID.
 	// which is an order of the validator in the StandByValidators list.
-	ids = []int{1, 3, 0, 2}
+	ids = []int{1, 3, 0, 2, 4, 5}
 	// orders maps to validators id to it's order by public key sorting.
-	orders = []int{2, 0, 3, 1}
+	orders = []int{2, 0, 3, 1, 4, 5}
 )
 
 // Size returns testchain initial validators amount.
 func Size() int {
+	return ValidatorsCount
+}
+
+// CommitteeSize returns testchain committee size.
+func CommitteeSize() int {
 	return len(privNetKeys)
 }
 
@@ -66,7 +79,7 @@ func PrivateKeyByID(id int) *keys.PrivateKey {
 // MultisigVerificationScript returns script hash of the consensus multisig address.
 func MultisigVerificationScript() []byte {
 	var pubs keys.PublicKeys
-	for i := range privNetKeys {
+	for i := range privNetKeys[:ValidatorsCount] {
 		priv := PrivateKey(ids[i])
 		pubs = append(pubs, priv.PublicKey())
 	}
@@ -88,6 +101,31 @@ func MultisigAddress() string {
 	return address.Uint160ToString(MultisigScriptHash())
 }
 
+// CommitteeVerificationScript returns script hash of the committee multisig address.
+func CommitteeVerificationScript() []byte {
+	var pubs keys.PublicKeys
+	for i := range privNetKeys {
+		priv := PrivateKey(ids[i])
+		pubs = append(pubs, priv.PublicKey())
+	}
+
+	script, err := smartcontract.CreateMajorityMultiSigRedeemScript(pubs)
+	if err != nil {
+		panic(err)
+	}
+	return script
+}
+
+// CommitteeScriptHash returns committee address as Uint160.
+func CommitteeScriptHash() util.Uint160 {
+	return hash.Hash160(CommitteeVerificationScript())
+}
+
+// CommitteeAddress return committee address as string.
+func CommitteeAddress() string {
+	return address.Uint160ToString(CommitteeScriptHash())
+}
+
 // Sign signs data by all consensus nodes and returns invocation script.
 func Sign(data []byte) []byte {
 	buf := io.NewBufBinWriter()
@@ -102,6 +140,20 @@ func Sign(data []byte) []byte {
 	return buf.Bytes()
 }
 
+// SignCommittee signs data by a majority of committee members.
+func SignCommittee(data []byte) []byte {
+	buf := io.NewBufBinWriter()
+	for i := 0; i < CommitteeSize()/2+1; i++ {
+		pKey := PrivateKey(i)
+		sig := pKey.Sign(data)
+		if len(sig) != 64 {
+			panic("wrong signature length")
+		}
+		emit.Bytes(buf.BinWriter, sig)
+	}
+	return buf.Bytes()
+}
+
 // NewBlock creates new block for the given blockchain with the given offset
 // (usually, 1), primary node index and transactions.
 func NewBlock(t *testing.T, bc blockchainer.Blockchainer, offset uint32, primary uint32, txs ...*transaction.Transaction) *block.Block {