evm: fix types unit tests (#154)

* tests: fix evm unit tests

* lint

x/evm/types/msg.go

@@ -8,6 +8,7 @@ import (
 	sdk "github.com/cosmos/cosmos-sdk/types"
 	sdkerrors "github.com/cosmos/cosmos-sdk/types/errors"
 	"github.com/cosmos/cosmos-sdk/x/auth/ante"
+
 	"github.com/cosmos/ethermint/types"
 
 	"github.com/ethereum/go-ethereum/common"

x/evm/types/storage.go

@@ -1,11 +1,12 @@
 package types
 
 import (
-	"bytes"
 	"fmt"
 
 	sdkerrors "github.com/cosmos/cosmos-sdk/types/errors"
 
+	"github.com/cosmos/ethermint/types"
+
 	ethcmn "github.com/ethereum/go-ethereum/common"
 )
 
@@ -50,7 +51,7 @@ func (s Storage) Copy() Storage {
 
 // Validate performs a basic validation of the State fields.
 func (s State) Validate() error {
-	if bytes.Equal(ethcmn.Hex2Bytes(s.Key), ethcmn.Hash{}.Bytes()) {
+	if types.IsEmptyHash(s.Key) {
 		return sdkerrors.Wrap(ErrInvalidState, "state key hash cannot be empty")
 	}
 	// NOTE: state value can be empty

x/evm/types/utils.go

@@ -4,21 +4,15 @@ import (
 	log "github.com/xlab/suplog"
 
 	"github.com/gogo/protobuf/proto"
-	"github.com/pkg/errors"
 
 	sdk "github.com/cosmos/cosmos-sdk/types"
+	sdkerrors "github.com/cosmos/cosmos-sdk/types/errors"
 
 	"github.com/ethereum/go-ethereum/crypto"
 )
 
 var EmptyCodeHash = crypto.Keccak256(nil)
 
-// EncodeTxResponse takes all of the necessary data from the EVM execution
-// and returns the data as a byte slice encoded with protobuf.
-func EncodeTxResponse(res *MsgEthereumTxResponse) ([]byte, error) {
-	return proto.Marshal(res)
-}
-
 // DecodeTxResponse decodes an protobuf-encoded byte slice into TxResponse
 func DecodeTxResponse(in []byte) (*MsgEthereumTxResponse, error) {
 	var txMsgData sdk.TxMsgData
@@ -27,17 +21,16 @@ func DecodeTxResponse(in []byte) (*MsgEthereumTxResponse, error) {
 		return nil, err
 	}
 
-	dataList := txMsgData.GetData()
+	data := txMsgData.GetData()
-	if len(dataList) == 0 {
+	if len(data) == 0 {
 		return &MsgEthereumTxResponse{}, nil
 	}
 
 	var res MsgEthereumTxResponse
 
-	err := proto.Unmarshal(dataList[0].GetData(), &res)
+	err := proto.Unmarshal(data[0].GetData(), &res)
 	if err != nil {
-		err = errors.Wrap(err, "proto.Unmarshal failed")
+		return nil, sdkerrors.Wrap(err, "failed to unmarshal tx response message data")
-		return nil, err
 	}
 
 	return &res, nil

x/evm/types/utils_test.go

@@ -3,10 +3,13 @@ package types
 import (
 	"testing"
 
+	sdk "github.com/cosmos/cosmos-sdk/types"
 	"github.com/cosmos/ethermint/crypto/ethsecp256k1"
+	proto "github.com/gogo/protobuf/proto"
 
 	"github.com/stretchr/testify/require"
 
+	"github.com/ethereum/go-ethereum/common"
 	ethcmn "github.com/ethereum/go-ethereum/common"
 	ethcrypto "github.com/ethereum/go-ethereum/crypto"
 )
@@ -25,6 +28,7 @@ func TestEvmDataEncoding(t *testing.T) {
 	ret := []byte{0x5, 0x8}
 
 	data := &MsgEthereumTxResponse{
+		Hash: common.BytesToHash([]byte("hash")).String(),
 		Logs: []*Log{{
 			Data:        []byte{1, 2, 3, 4},
 			BlockNumber: 17,
@@ -32,10 +36,17 @@ func TestEvmDataEncoding(t *testing.T) {
 		Ret: ret,
 	}
 
-	enc, err := EncodeTxResponse(data)
+	enc, err := proto.Marshal(data)
 	require.NoError(t, err)
 
-	res, err := DecodeTxResponse(enc)
+	txData := &sdk.TxMsgData{
+		Data: []*sdk.MsgData{{MsgType: TypeMsgEthereumTx, Data: enc}},
+	}
+
+	txDataBz, err := proto.Marshal(txData)
+	require.NoError(t, err)
+
+	res, err := DecodeTxResponse(txDataBz)
 	require.NoError(t, err)
 	require.NotNil(t, res)
 	require.Equal(t, data.Logs, res.Logs)