rpc/backend/backend.go

@@ -51,10 +51,10 @@ type EVMBackend interface {
 
 	// Blockchain API
 	BlockNumber() (hexutil.Uint64, error)
+	GetBlockByNumber(blockNum types.BlockNumber, fullTx bool) (map[string]interface{}, error)
 	GetTendermintBlockByNumber(blockNum types.BlockNumber) (*tmrpctypes.ResultBlock, error)
 	GetTendermintBlockResultByNumber(height *int64) (*tmrpctypes.ResultBlockResults, error)
 	GetTendermintBlockByHash(blockHash common.Hash) (*tmrpctypes.ResultBlock, error)
-	GetBlockByNumber(blockNum types.BlockNumber, fullTx bool) (map[string]interface{}, error)
 	GetBlockByHash(hash common.Hash, fullTx bool) (map[string]interface{}, error)
 	BlockByNumber(blockNum types.BlockNumber) (*ethtypes.Block, error)
 	BlockByHash(blockHash common.Hash) (*ethtypes.Block, error)

rpc/backend/backend_suite_test.go

@@ -1,18 +1,21 @@
 package backend
 
 import (
+	"math/big"
 	"testing"
 
 	"github.com/cosmos/cosmos-sdk/client"
 	"github.com/cosmos/cosmos-sdk/server"
-	grpctypes "github.com/cosmos/cosmos-sdk/types/grpc"
+	sdk "github.com/cosmos/cosmos-sdk/types"
-	mock "github.com/stretchr/testify/mock"
+	"github.com/ethereum/go-ethereum/common"
-	"github.com/stretchr/testify/require"
+	ethtypes "github.com/ethereum/go-ethereum/core/types"
 	"github.com/stretchr/testify/suite"
-	"google.golang.org/grpc"
+	tmrpctypes "github.com/tendermint/tendermint/rpc/core/types"
-	"google.golang.org/grpc/metadata"
 
+	"github.com/evmos/ethermint/app"
+	"github.com/evmos/ethermint/encoding"
 	"github.com/evmos/ethermint/rpc/backend/mocks"
+	ethrpc "github.com/evmos/ethermint/rpc/types"
 	rpc "github.com/evmos/ethermint/rpc/types"
 	evmtypes "github.com/evmos/ethermint/x/evm/types"
 )
@@ -30,44 +33,89 @@ func TestBackendTestSuite(t *testing.T) {
 func (suite *BackendTestSuite) SetupTest() {
 	ctx := server.NewDefaultContext()
 	ctx.Viper.Set("telemetry.global-labels", []interface{}{})
-	clientCtx := client.Context{}.WithChainID("ethermint_9000-1").WithHeight(1)
+
+	encodingConfig := encoding.MakeConfig(app.ModuleBasics)
+	clientCtx := client.Context{}.WithChainID("ethermint_9000-1").
+		WithHeight(1).
+		WithTxConfig(encodingConfig.TxConfig)
+
 	allowUnprotectedTxs := false
 
 	suite.backend = NewBackend(ctx, ctx.Logger, clientCtx, allowUnprotectedTxs)
-
+	suite.backend.queryClient.QueryClient = mocks.NewQueryClient(suite.T())
-	queryClient := mocks.NewQueryClient(suite.T())
+	suite.backend.clientCtx.Client = mocks.NewClient(suite.T())
-	var header metadata.MD
-	RegisterMockQueries(queryClient, &header)
-
-	suite.backend.queryClient.QueryClient = queryClient
 	suite.backend.ctx = rpc.ContextWithHeight(1)
 }
 
-// QueryClient defines a mocked object that implements the grpc QueryCLient
+// buildEthereumTx returns an example legacy Ethereum transaction
-// interface. It's used on tests to test the JSON-RPC without running a grpc
+func (suite *BackendTestSuite) buildEthereumTx() (*evmtypes.MsgEthereumTx, []byte) {
-// client server. E.g. JSON-PRC-CLIENT -> BACKEND -> Mock GRPC CLIENT -> APP
+	msgEthereumTx := evmtypes.NewTx(
-var _ evmtypes.QueryClient = &mocks.QueryClient{}
+		big.NewInt(1),
+		uint64(0),
+		&common.Address{},
+		big.NewInt(0),
+		100000,
+		big.NewInt(1),
+		nil,
+		nil,
+		nil,
+		nil,
+	)
 
-// RegisterMockQueries registers the queries and their respective responses,
+	// A valid msg should have empty `From`
-// so that they can be called in tests using the queryClient
+	msgEthereumTx.From = ""
-func RegisterMockQueries(queryClient *mocks.QueryClient, header *metadata.MD) {
+
-	queryClient.On("Params", rpc.ContextWithHeight(1), &evmtypes.QueryParamsRequest{}, grpc.Header(header)).
+	txBuilder := suite.backend.clientCtx.TxConfig.NewTxBuilder()
-		Return(&evmtypes.QueryParamsResponse{}, nil).
+	err := txBuilder.SetMsgs(msgEthereumTx)
-		Run(func(args mock.Arguments) {
+	suite.Require().NoError(err)
-			// If Params call is successful, also update the header height
+
-			arg := args.Get(2).(grpc.HeaderCallOption)
+	bz, err := suite.backend.clientCtx.TxConfig.TxEncoder()(txBuilder.GetTx())
-			h := metadata.MD{}
+	suite.Require().NoError(err)
-			h.Set(grpctypes.GRPCBlockHeightHeader, "1")
+	return msgEthereumTx, bz
-			*arg.HeaderAddr = h
-		})
 }
 
-func TestQueryClient(t *testing.T) {
+// buildFormattedBlock returns a formatted block for testing
-	queryClient := mocks.NewQueryClient(t)
+func (suite *BackendTestSuite) buildFormattedBlock(
-	var header metadata.MD
+	blockRes *tmrpctypes.ResultBlockResults,
-	RegisterMockQueries(queryClient, &header)
+	resBlock *tmrpctypes.ResultBlock,
+	fullTx bool,
+	tx *evmtypes.MsgEthereumTx,
+	validator sdk.AccAddress,
+	baseFee *big.Int,
+) map[string]interface{} {
+	header := resBlock.Block.Header
+	gasLimit := int64(^uint32(0)) // for `MaxGas = -1` (DefaultConsensusParams)
+	gasUsed := new(big.Int).SetUint64(uint64(blockRes.TxsResults[0].GasUsed))
 
-	// mock calls for abstraction
+	root := common.Hash{}.Bytes()
-	_, err := queryClient.Params(rpc.ContextWithHeight(1), &evmtypes.QueryParamsRequest{}, grpc.Header(&header))
+	receipt := ethtypes.NewReceipt(root, false, gasUsed.Uint64())
-	require.NoError(t, err)
+	bloom := ethtypes.CreateBloom(ethtypes.Receipts{receipt})
+
+	ethRPCTxs := []interface{}{}
+	if tx != nil {
+		if fullTx {
+			rpcTx, err := ethrpc.NewRPCTransaction(
+				tx.AsTransaction(),
+				common.BytesToHash(header.Hash()),
+				uint64(header.Height),
+				uint64(0),
+				baseFee,
+			)
+			suite.Require().NoError(err)
+			ethRPCTxs = []interface{}{rpcTx}
+		} else {
+			ethRPCTxs = []interface{}{common.HexToHash(tx.Hash)}
+		}
+	}
+
+	return ethrpc.FormatBlock(
+		header,
+		resBlock.Block.Size(),
+		gasLimit,
+		gasUsed,
+		ethRPCTxs,
+		bloom,
+		common.BytesToAddress(validator.Bytes()),
+		baseFee,
+	)
 }

rpc/backend/client_test.go

@@ -0,0 +1,147 @@
+package backend
+
+import (
+	"testing"
+
+	sdkerrors "github.com/cosmos/cosmos-sdk/types/errors"
+	"github.com/ethereum/go-ethereum/common"
+	"github.com/evmos/ethermint/rpc/backend/mocks"
+	rpc "github.com/evmos/ethermint/rpc/types"
+	mock "github.com/stretchr/testify/mock"
+	"github.com/stretchr/testify/require"
+	abci "github.com/tendermint/tendermint/abci/types"
+	tmrpcclient "github.com/tendermint/tendermint/rpc/client"
+	tmrpctypes "github.com/tendermint/tendermint/rpc/core/types"
+	"github.com/tendermint/tendermint/types"
+)
+
+// Client defines a mocked object that implements the Tendermint JSON-RPC Client
+// interface. It allows for performing Client queries without having to run a
+// Tendermint RPC Client server.
+//
+// To use a mock method it has to be registered in a given test.
+var _ tmrpcclient.Client = &mocks.Client{}
+
+// Block
+func RegisterBlock(
+	client *mocks.Client,
+	height int64,
+	tx []byte,
+) (*tmrpctypes.ResultBlock, error) {
+	// without tx
+	if tx == nil {
+		emptyBlock := types.MakeBlock(height, []types.Tx{}, nil, nil)
+		resBlock := &tmrpctypes.ResultBlock{Block: emptyBlock}
+		client.On("Block", rpc.ContextWithHeight(height), mock.AnythingOfType("*int64")).
+			Return(resBlock, nil)
+		return resBlock, nil
+	}
+
+	// with tx
+	block := types.MakeBlock(height, []types.Tx{tx}, nil, nil)
+	res := &tmrpctypes.ResultBlock{Block: block}
+	client.On("Block", rpc.ContextWithHeight(height), mock.AnythingOfType("*int64")).
+		Return(res, nil)
+	return res, nil
+}
+
+// Block returns error
+func RegisterBlockError(client *mocks.Client, height int64) {
+	client.On("Block", rpc.ContextWithHeight(height), mock.AnythingOfType("*int64")).
+		Return(nil, sdkerrors.ErrInvalidRequest)
+}
+
+// Block not found
+func RegisterBlockNotFound(
+	client *mocks.Client,
+	height int64,
+) (*tmrpctypes.ResultBlock, error) {
+	client.On("Block", rpc.ContextWithHeight(height), mock.AnythingOfType("*int64")).
+		Return(&tmrpctypes.ResultBlock{Block: nil}, nil)
+
+	return &tmrpctypes.ResultBlock{Block: nil}, nil
+}
+
+func TestRegisterBlock(t *testing.T) {
+	client := mocks.NewClient(t)
+	height := rpc.BlockNumber(1).Int64()
+	RegisterBlock(client, height, nil)
+
+	res, err := client.Block(rpc.ContextWithHeight(height), &height)
+
+	emptyBlock := types.MakeBlock(height, []types.Tx{}, nil, nil)
+	resBlock := &tmrpctypes.ResultBlock{Block: emptyBlock}
+	require.Equal(t, resBlock, res)
+	require.NoError(t, err)
+}
+
+// ConsensusParams
+func RegisterConsensusParams(client *mocks.Client, height int64) {
+	consensusParams := types.DefaultConsensusParams()
+	client.On("ConsensusParams", rpc.ContextWithHeight(height), mock.AnythingOfType("*int64")).
+		Return(&tmrpctypes.ResultConsensusParams{ConsensusParams: *consensusParams}, nil)
+}
+
+func RegisterConsensusParamsError(client *mocks.Client, height int64) {
+	client.On("ConsensusParams", rpc.ContextWithHeight(height), mock.AnythingOfType("*int64")).
+		Return(nil, sdkerrors.ErrInvalidRequest)
+}
+
+func TestRegisterConsensusParams(t *testing.T) {
+	client := mocks.NewClient(t)
+	height := int64(1)
+	RegisterConsensusParams(client, height)
+
+	res, err := client.ConsensusParams(rpc.ContextWithHeight(height), &height)
+	consensusParams := types.DefaultConsensusParams()
+	require.Equal(t, &tmrpctypes.ResultConsensusParams{ConsensusParams: *consensusParams}, res)
+	require.NoError(t, err)
+}
+
+// BlockResults
+func RegisterBlockResults(
+	client *mocks.Client,
+	height int64,
+) (*tmrpctypes.ResultBlockResults, error) {
+	res := &tmrpctypes.ResultBlockResults{
+		Height:     height,
+		TxsResults: []*abci.ResponseDeliverTx{{Code: 0, GasUsed: 0}},
+	}
+
+	client.On("BlockResults", rpc.ContextWithHeight(height), mock.AnythingOfType("*int64")).
+		Return(res, nil)
+	return res, nil
+}
+
+func RegisterBlockResultsError(client *mocks.Client, height int64) {
+	client.On("BlockResults", rpc.ContextWithHeight(height), mock.AnythingOfType("*int64")).
+		Return(nil, sdkerrors.ErrInvalidRequest)
+}
+
+func TestRegisterBlockResults(t *testing.T) {
+	client := mocks.NewClient(t)
+	height := int64(1)
+	RegisterBlockResults(client, height)
+
+	res, err := client.BlockResults(rpc.ContextWithHeight(height), &height)
+	expRes := &tmrpctypes.ResultBlockResults{
+		Height:     height,
+		TxsResults: []*abci.ResponseDeliverTx{{Code: 0, GasUsed: 0}},
+	}
+	require.Equal(t, expRes, res)
+	require.NoError(t, err)
+}
+
+// BlockByHash
+func RegisterBlockByHash(
+	client *mocks.Client,
+	hash common.Hash,
+	tx []byte,
+) (*tmrpctypes.ResultBlock, error) {
+	block := types.MakeBlock(1, []types.Tx{tx}, nil, nil)
+	resBlock := &tmrpctypes.ResultBlock{Block: block}
+
+	client.On("BlockByHash", rpc.ContextWithHeight(1), []byte{0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0}).
+		Return(resBlock, nil)
+	return resBlock, nil
+}

rpc/backend/evm_backend.go

@@ -103,7 +103,13 @@ func (b *Backend) GetBlockByHash(hash common.Hash, fullTx bool) (map[string]inte
 		return nil, nil
 	}
 
-	return b.EthBlockFromTendermint(resBlock, blockRes, fullTx)
+	res, err := b.EthBlockFromTendermint(resBlock, blockRes, fullTx)
+	if err != nil {
+		b.logger.Debug("EthBlockFromTendermint failed", "hash", hash, "error", err.Error())
+		return nil, err
+	}
+
+	return res, nil
 }
 
 // BlockByNumber returns the block identified by number.
@@ -177,7 +183,8 @@ func (b *Backend) EthBlockFromTm(resBlock *tmrpctypes.ResultBlock, blockRes *tmr
 	return ethBlock, nil
 }
 
-// GetTendermintBlockByNumber returns a Tendermint format block by block number
+// GetTendermintBlockByNumber returns a Tendermint formatted block for a given
+// block number
 func (b *Backend) GetTendermintBlockByNumber(blockNum types.BlockNumber) (*tmrpctypes.ResultBlock, error) {
 	height := blockNum.Int64()
 	if height <= 0 {
@@ -239,7 +246,8 @@ func (b *Backend) BlockBloom(blockRes *tmrpctypes.ResultBlockResults) (ethtypes.
 	return ethtypes.Bloom{}, errors.New("block bloom event is not found")
 }
 
-// EthBlockFromTendermint returns a JSON-RPC compatible Ethereum block from a given Tendermint block and its block result.
+// EthBlockFromTendermint returns a JSON-RPC compatible Ethereum block from a
+// given Tendermint block and its block result.
 func (b *Backend) EthBlockFromTendermint(
 	resBlock *tmrpctypes.ResultBlock,
 	blockRes *tmrpctypes.ResultBlockResults,
@@ -981,17 +989,22 @@ func (b *Backend) FeeHistory(
 	return &feeHistory, nil
 }
 
-// GetEthereumMsgsFromTendermintBlock returns all real MsgEthereumTxs from a Tendermint block.
+// GetEthereumMsgsFromTendermintBlock returns all real MsgEthereumTxs from a
-// It also ensures consistency over the correct txs indexes across RPC endpoints
+// Tendermint block. It also ensures consistency over the correct txs indexes
-func (b *Backend) GetEthereumMsgsFromTendermintBlock(resBlock *tmrpctypes.ResultBlock, blockRes *tmrpctypes.ResultBlockResults) []*evmtypes.MsgEthereumTx {
+// across RPC endpoints
+func (b *Backend) GetEthereumMsgsFromTendermintBlock(
+	resBlock *tmrpctypes.ResultBlock,
+	blockRes *tmrpctypes.ResultBlockResults,
+) []*evmtypes.MsgEthereumTx {
 	var result []*evmtypes.MsgEthereumTx
 	block := resBlock.Block
 
 	txResults := blockRes.TxsResults
 
 	for i, tx := range block.Txs {
-		// check tx exists on EVM by cross checking with blockResults
+		// Check if tx exists on EVM by cross checking with blockResults:
-		// include the tx that exceeds block gas limit
+		//  - Include unsuccessful tx that exceeds block gas limit
+		//  - Exclude unsuccessful tx with any other error but ExceedBlockGasLimit
 		if !TxSuccessOrExceedsBlockGasLimit(txResults[i]) {
 			b.logger.Debug("invalid tx result code", "cosmos-hash", hexutil.Encode(tx.Hash()))
 			continue

rpc/backend/evm_backend_test.go

@@ -1,30 +1,983 @@
 package backend
 
-import "github.com/ethereum/go-ethereum/common/hexutil"
+import (
+	"fmt"
+	"math/big"
+
+	sdk "github.com/cosmos/cosmos-sdk/types"
+	"github.com/ethereum/go-ethereum/common"
+	"github.com/ethereum/go-ethereum/common/hexutil"
+	ethtypes "github.com/ethereum/go-ethereum/core/types"
+	"github.com/tendermint/tendermint/abci/types"
+	tmrpctypes "github.com/tendermint/tendermint/rpc/core/types"
+	tmtypes "github.com/tendermint/tendermint/types"
+	"google.golang.org/grpc/metadata"
+
+	"github.com/evmos/ethermint/rpc/backend/mocks"
+	ethrpc "github.com/evmos/ethermint/rpc/types"
+	"github.com/evmos/ethermint/tests"
+	evmtypes "github.com/evmos/ethermint/x/evm/types"
+	feemarkettypes "github.com/evmos/ethermint/x/feemarket/types"
+)
 
 func (suite *BackendTestSuite) TestBlockNumber() {
 	testCases := []struct {
-		mame           string
+		name           string
-		malleate       func()
+		registerMock   func()
 		expBlockNumber hexutil.Uint64
 		expPass        bool
 	}{
 		{
-			"pass",
+			"fail - invalid block header height",
 			func() {
+				height := int64(1)
+				var header metadata.MD
+				queryClient := suite.backend.queryClient.QueryClient.(*mocks.QueryClient)
+				RegisterParamsInvalidHeight(queryClient, &header, int64(height))
+			},
+			0x0,
+			false,
+		},
+		{
+			"fail - invalid block header",
+			func() {
+				height := int64(1)
+				var header metadata.MD
+				queryClient := suite.backend.queryClient.QueryClient.(*mocks.QueryClient)
+				RegisterParamsInvalidHeader(queryClient, &header, int64(height))
+			},
+			0x0,
+			false,
+		},
+		{
+			"pass - app state header height 1",
+			func() {
+				height := int64(1)
+				var header metadata.MD
+				queryClient := suite.backend.queryClient.QueryClient.(*mocks.QueryClient)
+				RegisterParams(queryClient, &header, int64(height))
 			},
 			0x1,
 			true,
 		},
 	}
 	for _, tc := range testCases {
-		blockNumber, err := suite.backend.BlockNumber()
+		suite.Run(fmt.Sprintf("Case %s", tc.name), func() {
+			suite.SetupTest() // reset test and queries
+			tc.registerMock()
 
-		if tc.expPass {
+			blockNumber, err := suite.backend.BlockNumber()
-			suite.Require().NoError(err)
+
-			suite.Require().Equal(tc.expBlockNumber, blockNumber)
+			if tc.expPass {
-		} else {
+				suite.Require().NoError(err)
-			suite.Require().Error(err)
+				suite.Require().Equal(tc.expBlockNumber, blockNumber)
-		}
+			} else {
+				suite.Require().Error(err)
+			}
+		})
+	}
+}
+
+func (suite *BackendTestSuite) TestGetBlockByNumber() {
+	var (
+		blockRes *tmrpctypes.ResultBlockResults
+		resBlock *tmrpctypes.ResultBlock
+	)
+	msgEthereumTx, bz := suite.buildEthereumTx()
+
+	testCases := []struct {
+		name         string
+		blockNumber  ethrpc.BlockNumber
+		fullTx       bool
+		baseFee      *big.Int
+		validator    sdk.AccAddress
+		tx           *evmtypes.MsgEthereumTx
+		txBz         []byte
+		registerMock func(ethrpc.BlockNumber, sdk.Int, sdk.AccAddress, []byte)
+		expNoop      bool
+		expPass      bool
+	}{
+		{
+			"fail - tendermint block error",
+			ethrpc.BlockNumber(1),
+			true,
+			sdk.NewInt(1).BigInt(),
+			sdk.AccAddress(tests.GenerateAddress().Bytes()),
+			nil,
+			nil,
+			func(blockNum ethrpc.BlockNumber, _ sdk.Int, _ sdk.AccAddress, _ []byte) {
+				height := blockNum.Int64()
+				client := suite.backend.clientCtx.Client.(*mocks.Client)
+				RegisterBlockError(client, height)
+			},
+			false,
+			false,
+		},
+		{
+			"pass - block not found (e.g. request block height that is greater than current one)",
+			ethrpc.BlockNumber(1),
+			true,
+			sdk.NewInt(1).BigInt(),
+			sdk.AccAddress(tests.GenerateAddress().Bytes()),
+			nil,
+			nil,
+			func(blockNum ethrpc.BlockNumber, baseFee sdk.Int, validator sdk.AccAddress, txBz []byte) {
+				height := blockNum.Int64()
+				client := suite.backend.clientCtx.Client.(*mocks.Client)
+				resBlock, _ = RegisterBlockNotFound(client, height)
+			},
+			true,
+			true,
+		},
+		{
+			"pass - block results error",
+			ethrpc.BlockNumber(1),
+			true,
+			sdk.NewInt(1).BigInt(),
+			sdk.AccAddress(tests.GenerateAddress().Bytes()),
+			nil,
+			nil,
+			func(blockNum ethrpc.BlockNumber, baseFee sdk.Int, validator sdk.AccAddress, txBz []byte) {
+				height := blockNum.Int64()
+				client := suite.backend.clientCtx.Client.(*mocks.Client)
+				resBlock, _ = RegisterBlock(client, height, txBz)
+				RegisterBlockResultsError(client, blockNum.Int64())
+			},
+			true,
+			true,
+		},
+		{
+			"pass - without tx",
+			ethrpc.BlockNumber(1),
+			true,
+			sdk.NewInt(1).BigInt(),
+			sdk.AccAddress(tests.GenerateAddress().Bytes()),
+			nil,
+			nil,
+			func(blockNum ethrpc.BlockNumber, baseFee sdk.Int, validator sdk.AccAddress, txBz []byte) {
+				height := blockNum.Int64()
+				client := suite.backend.clientCtx.Client.(*mocks.Client)
+				resBlock, _ = RegisterBlock(client, height, txBz)
+				blockRes, _ = RegisterBlockResults(client, blockNum.Int64())
+				RegisterConsensusParams(client, height)
+
+				queryClient := suite.backend.queryClient.QueryClient.(*mocks.QueryClient)
+				RegisterBaseFee(queryClient, baseFee)
+				RegisterValidatorAccount(queryClient, validator)
+			},
+			false,
+			true,
+		},
+		{
+			"pass - with tx",
+			ethrpc.BlockNumber(1),
+			true,
+			sdk.NewInt(1).BigInt(),
+			sdk.AccAddress(tests.GenerateAddress().Bytes()),
+			msgEthereumTx,
+			bz,
+			func(blockNum ethrpc.BlockNumber, baseFee sdk.Int, validator sdk.AccAddress, txBz []byte) {
+				height := blockNum.Int64()
+				client := suite.backend.clientCtx.Client.(*mocks.Client)
+				resBlock, _ = RegisterBlock(client, height, txBz)
+				blockRes, _ = RegisterBlockResults(client, blockNum.Int64())
+				RegisterConsensusParams(client, height)
+
+				queryClient := suite.backend.queryClient.QueryClient.(*mocks.QueryClient)
+				RegisterBaseFee(queryClient, baseFee)
+				RegisterValidatorAccount(queryClient, validator)
+			},
+			false,
+			true,
+		},
+	}
+	for _, tc := range testCases {
+		suite.Run(fmt.Sprintf("Case %s", tc.name), func() {
+			suite.SetupTest() // reset test and queries
+			tc.registerMock(tc.blockNumber, sdk.NewIntFromBigInt(tc.baseFee), tc.validator, tc.txBz)
+
+			block, err := suite.backend.GetBlockByNumber(tc.blockNumber, tc.fullTx)
+
+			if tc.expPass {
+				if tc.expNoop {
+					suite.Require().Nil(block)
+				} else {
+					expBlock := suite.buildFormattedBlock(
+						blockRes,
+						resBlock,
+						tc.fullTx,
+						tc.tx,
+						tc.validator,
+						tc.baseFee,
+					)
+					suite.Require().Equal(expBlock, block)
+				}
+				suite.Require().NoError(err)
+
+			} else {
+				suite.Require().Error(err)
+			}
+		})
+	}
+}
+
+func (suite *BackendTestSuite) TestGetBlockByHash() {
+	var (
+		blockRes *tmrpctypes.ResultBlockResults
+		resBlock *tmrpctypes.ResultBlock
+	)
+	msgEthereumTx, bz := suite.buildEthereumTx()
+
+	block := tmtypes.MakeBlock(1, []tmtypes.Tx{bz}, nil, nil)
+
+	testCases := []struct {
+		name         string
+		hash         common.Hash
+		fullTx       bool
+		baseFee      *big.Int
+		validator    sdk.AccAddress
+		tx           *evmtypes.MsgEthereumTx
+		txBz         []byte
+		registerMock func(common.Hash, sdk.Int, sdk.AccAddress, []byte)
+		expNoop      bool
+		expPass      bool
+	}{
+		{
+			"pass - without tx",
+			common.BytesToHash(block.Hash()),
+			true,
+			sdk.NewInt(1).BigInt(),
+			sdk.AccAddress(tests.GenerateAddress().Bytes()),
+			nil,
+			nil,
+			func(hash common.Hash, baseFee sdk.Int, validator sdk.AccAddress, txBz []byte) {
+				height := int64(1)
+				client := suite.backend.clientCtx.Client.(*mocks.Client)
+				resBlock, _ = RegisterBlockByHash(client, hash, txBz)
+
+				blockRes, _ = RegisterBlockResults(client, height)
+				RegisterConsensusParams(client, height)
+
+				queryClient := suite.backend.queryClient.QueryClient.(*mocks.QueryClient)
+				RegisterBaseFee(queryClient, baseFee)
+				RegisterValidatorAccount(queryClient, validator)
+			},
+			false,
+			true,
+		},
+		{
+			"pass - with tx",
+			common.BytesToHash(block.Hash()),
+			true,
+			sdk.NewInt(1).BigInt(),
+			sdk.AccAddress(tests.GenerateAddress().Bytes()),
+			msgEthereumTx,
+			bz,
+			func(hash common.Hash, baseFee sdk.Int, validator sdk.AccAddress, txBz []byte) {
+				height := int64(1)
+				client := suite.backend.clientCtx.Client.(*mocks.Client)
+				resBlock, _ = RegisterBlockByHash(client, hash, txBz)
+
+				blockRes, _ = RegisterBlockResults(client, height)
+				RegisterConsensusParams(client, height)
+
+				queryClient := suite.backend.queryClient.QueryClient.(*mocks.QueryClient)
+				RegisterBaseFee(queryClient, baseFee)
+				RegisterValidatorAccount(queryClient, validator)
+			},
+			false,
+			true,
+		},
+	}
+	for _, tc := range testCases {
+		suite.Run(fmt.Sprintf("Case %s", tc.name), func() {
+			suite.SetupTest() // reset test and queries
+			tc.registerMock(tc.hash, sdk.NewIntFromBigInt(tc.baseFee), tc.validator, tc.txBz)
+
+			block, err := suite.backend.GetBlockByHash(tc.hash, tc.fullTx)
+
+			if tc.expPass {
+				if tc.expNoop {
+					suite.Require().Nil(block)
+				} else {
+					expBlock := suite.buildFormattedBlock(
+						blockRes,
+						resBlock,
+						tc.fullTx,
+						tc.tx,
+						tc.validator,
+						tc.baseFee,
+					)
+					suite.Require().Equal(expBlock, block)
+				}
+				suite.Require().NoError(err)
+
+			} else {
+				suite.Require().Error(err)
+			}
+		})
+	}
+}
+
+func (suite *BackendTestSuite) TestGetTendermintBlockByNumber() {
+	var expResultBlock *tmrpctypes.ResultBlock
+
+	testCases := []struct {
+		name         string
+		blockNumber  ethrpc.BlockNumber
+		registerMock func(ethrpc.BlockNumber)
+		found        bool
+		expPass      bool
+	}{
+		{
+			"fail - client error",
+			ethrpc.BlockNumber(1),
+			func(blockNum ethrpc.BlockNumber) {
+				height := blockNum.Int64()
+				client := suite.backend.clientCtx.Client.(*mocks.Client)
+				RegisterBlockError(client, height)
+			},
+			false,
+			false,
+		},
+		{
+			"noop - block not found",
+			ethrpc.BlockNumber(1),
+			func(blockNum ethrpc.BlockNumber) {
+				height := blockNum.Int64()
+				client := suite.backend.clientCtx.Client.(*mocks.Client)
+				RegisterBlockNotFound(client, height)
+			},
+			false,
+			true,
+		},
+		{
+			"fail - blockNum < 0 with app state height error",
+			ethrpc.BlockNumber(-1),
+			func(_ ethrpc.BlockNumber) {
+				appHeight := int64(1)
+				var header metadata.MD
+				queryClient := suite.backend.queryClient.QueryClient.(*mocks.QueryClient)
+				RegisterParamsError(queryClient, &header, appHeight)
+			},
+			false,
+			false,
+		},
+		{
+			"pass - blockNum < 0 with app state height >= 1",
+			ethrpc.BlockNumber(-1),
+			func(blockNum ethrpc.BlockNumber) {
+				appHeight := int64(1)
+				var header metadata.MD
+				queryClient := suite.backend.queryClient.QueryClient.(*mocks.QueryClient)
+				RegisterParams(queryClient, &header, appHeight)
+
+				tmHeight := appHeight
+				client := suite.backend.clientCtx.Client.(*mocks.Client)
+				expResultBlock, _ = RegisterBlock(client, tmHeight, nil)
+			},
+			true,
+			true,
+		},
+		{
+			"pass - blockNum = 0 (defaults to blockNum = 1 due to a difference between tendermint heights and geth heights",
+			ethrpc.BlockNumber(0),
+			func(blockNum ethrpc.BlockNumber) {
+				height := blockNum.Int64()
+				client := suite.backend.clientCtx.Client.(*mocks.Client)
+				expResultBlock, _ = RegisterBlock(client, height, nil)
+			},
+			true,
+			true,
+		},
+		{
+			"pass - blockNum = 1",
+			ethrpc.BlockNumber(1),
+			func(blockNum ethrpc.BlockNumber) {
+				height := blockNum.Int64()
+				client := suite.backend.clientCtx.Client.(*mocks.Client)
+				expResultBlock, _ = RegisterBlock(client, height, nil)
+			},
+			true,
+			true,
+		},
+	}
+	for _, tc := range testCases {
+		suite.Run(fmt.Sprintf("Case %s", tc.name), func() {
+			suite.SetupTest() // reset test and queries
+
+			tc.registerMock(tc.blockNumber)
+			resultBlock, err := suite.backend.GetTendermintBlockByNumber(tc.blockNumber)
+
+			if tc.expPass {
+				suite.Require().NoError(err)
+
+				if !tc.found {
+					suite.Require().Nil(resultBlock)
+				} else {
+					suite.Require().Equal(expResultBlock, resultBlock)
+					suite.Require().Equal(expResultBlock.Block.Header.Height, resultBlock.Block.Header.Height)
+				}
+			} else {
+				suite.Require().Error(err)
+			}
+		})
+	}
+}
+
+func (suite *BackendTestSuite) TestGetTendermintBlockResultByNumber() {
+	var expBlockRes *tmrpctypes.ResultBlockResults
+
+	testCases := []struct {
+		name         string
+		blockNumber  int64
+		registerMock func(int64)
+		expPass      bool
+	}{
+		{
+			"fail",
+			1,
+			func(blockNum int64) {
+				client := suite.backend.clientCtx.Client.(*mocks.Client)
+				RegisterBlockResultsError(client, blockNum)
+			},
+			false,
+		},
+		{
+			"pass",
+			1,
+			func(blockNum int64) {
+				client := suite.backend.clientCtx.Client.(*mocks.Client)
+				RegisterBlockResults(client, blockNum)
+
+				expBlockRes = &tmrpctypes.ResultBlockResults{
+					Height:     blockNum,
+					TxsResults: []*types.ResponseDeliverTx{{Code: 0, GasUsed: 0}},
+				}
+			},
+			true,
+		},
+	}
+	for _, tc := range testCases {
+		suite.Run(fmt.Sprintf("Case %s", tc.name), func() {
+			suite.SetupTest() // reset test and queries
+			tc.registerMock(tc.blockNumber)
+
+			blockRes, err := suite.backend.GetTendermintBlockResultByNumber(&tc.blockNumber)
+
+			if tc.expPass {
+				suite.Require().NoError(err)
+				suite.Require().Equal(expBlockRes, blockRes)
+			} else {
+				suite.Require().Error(err)
+			}
+		})
+	}
+}
+
+func (suite *BackendTestSuite) TestBlockBloom() {
+	testCases := []struct {
+		name          string
+		blockRes      *tmrpctypes.ResultBlockResults
+		expBlockBloom ethtypes.Bloom
+		expPass       bool
+	}{
+		{
+			"fail - empty block result",
+			&tmrpctypes.ResultBlockResults{},
+			ethtypes.Bloom{},
+			false,
+		},
+		{
+			"fail - non block bloom event type",
+			&tmrpctypes.ResultBlockResults{
+				EndBlockEvents: []types.Event{{Type: evmtypes.EventTypeEthereumTx}},
+			},
+			ethtypes.Bloom{},
+			false,
+		},
+		{
+			"fail - nonblock bloom attribute key",
+			&tmrpctypes.ResultBlockResults{
+				EndBlockEvents: []types.Event{
+					{
+						Type: evmtypes.EventTypeBlockBloom,
+						Attributes: []types.EventAttribute{
+							{Key: []byte(evmtypes.AttributeKeyEthereumTxHash)},
+						},
+					},
+				},
+			},
+			ethtypes.Bloom{},
+			false,
+		},
+		{
+			"pass - nonblock bloom attribute key",
+			&tmrpctypes.ResultBlockResults{
+				EndBlockEvents: []types.Event{
+					{
+						Type: evmtypes.EventTypeBlockBloom,
+						Attributes: []types.EventAttribute{
+							{Key: []byte(bAttributeKeyEthereumBloom)},
+						},
+					},
+				},
+			},
+			ethtypes.Bloom{},
+			true,
+		},
+	}
+	for _, tc := range testCases {
+		suite.Run(fmt.Sprintf("Case %s", tc.name), func() {
+			blockBloom, err := suite.backend.BlockBloom(tc.blockRes)
+
+			if tc.expPass {
+				suite.Require().NoError(err)
+				suite.Require().Equal(tc.expBlockBloom, blockBloom)
+			} else {
+				suite.Require().Error(err)
+			}
+		})
+	}
+}
+
+func (suite *BackendTestSuite) TestEthBlockFromTendermint() {
+	msgEthereumTx, bz := suite.buildEthereumTx()
+	emptyBlock := tmtypes.MakeBlock(1, []tmtypes.Tx{}, nil, nil)
+
+	testCases := []struct {
+		name         string
+		baseFee      *big.Int
+		validator    sdk.AccAddress
+		height       int64
+		resBlock     *tmrpctypes.ResultBlock
+		blockRes     *tmrpctypes.ResultBlockResults
+		fullTx       bool
+		registerMock func(sdk.Int, sdk.AccAddress, int64)
+		expTxs       bool
+		expPass      bool
+	}{
+		{
+			"pass - block without tx",
+			sdk.NewInt(1).BigInt(),
+			sdk.AccAddress(common.Address{}.Bytes()),
+			int64(1),
+			&tmrpctypes.ResultBlock{Block: emptyBlock},
+			&tmrpctypes.ResultBlockResults{
+				Height:     1,
+				TxsResults: []*types.ResponseDeliverTx{{Code: 0, GasUsed: 0}},
+			},
+			false,
+			func(baseFee sdk.Int, validator sdk.AccAddress, height int64) {
+				queryClient := suite.backend.queryClient.QueryClient.(*mocks.QueryClient)
+				RegisterBaseFee(queryClient, baseFee)
+				RegisterValidatorAccount(queryClient, validator)
+
+				client := suite.backend.clientCtx.Client.(*mocks.Client)
+				RegisterConsensusParams(client, height)
+			},
+			false,
+			true,
+		},
+		{
+			"pass - block with tx - with BaseFee error",
+			nil,
+			sdk.AccAddress(tests.GenerateAddress().Bytes()),
+			int64(1),
+			&tmrpctypes.ResultBlock{
+				Block: tmtypes.MakeBlock(1, []tmtypes.Tx{bz}, nil, nil),
+			},
+			&tmrpctypes.ResultBlockResults{
+				Height:     1,
+				TxsResults: []*types.ResponseDeliverTx{{Code: 0, GasUsed: 0}},
+			},
+			true,
+			func(baseFee sdk.Int, validator sdk.AccAddress, height int64) {
+				queryClient := suite.backend.queryClient.QueryClient.(*mocks.QueryClient)
+				RegisterBaseFeeError(queryClient)
+				RegisterValidatorAccount(queryClient, validator)
+
+				client := suite.backend.clientCtx.Client.(*mocks.Client)
+				RegisterConsensusParams(client, height)
+			},
+			true,
+			true,
+		},
+		{
+			"pass - block with tx - with ValidatorAccount error",
+			sdk.NewInt(1).BigInt(),
+			sdk.AccAddress(common.Address{}.Bytes()),
+			int64(1),
+			&tmrpctypes.ResultBlock{
+				Block: tmtypes.MakeBlock(1, []tmtypes.Tx{bz}, nil, nil),
+			},
+			&tmrpctypes.ResultBlockResults{
+				Height:     1,
+				TxsResults: []*types.ResponseDeliverTx{{Code: 0, GasUsed: 0}},
+			},
+			true,
+			func(baseFee sdk.Int, validator sdk.AccAddress, height int64) {
+				queryClient := suite.backend.queryClient.QueryClient.(*mocks.QueryClient)
+				RegisterBaseFee(queryClient, baseFee)
+				RegisterValidatorAccountError(queryClient)
+
+				client := suite.backend.clientCtx.Client.(*mocks.Client)
+				RegisterConsensusParams(client, height)
+			},
+			true,
+			true,
+		},
+		{
+			"pass - block with tx - with ConsensusParams error - BlockMaxGas defaults to max uint32",
+			sdk.NewInt(1).BigInt(),
+			sdk.AccAddress(tests.GenerateAddress().Bytes()),
+			int64(1),
+			&tmrpctypes.ResultBlock{
+				Block: tmtypes.MakeBlock(1, []tmtypes.Tx{bz}, nil, nil),
+			},
+			&tmrpctypes.ResultBlockResults{
+				Height:     1,
+				TxsResults: []*types.ResponseDeliverTx{{Code: 0, GasUsed: 0}},
+			},
+			true,
+			func(baseFee sdk.Int, validator sdk.AccAddress, height int64) {
+				queryClient := suite.backend.queryClient.QueryClient.(*mocks.QueryClient)
+				RegisterBaseFee(queryClient, baseFee)
+				RegisterValidatorAccount(queryClient, validator)
+
+				client := suite.backend.clientCtx.Client.(*mocks.Client)
+				RegisterConsensusParamsError(client, height)
+			},
+			true,
+			true,
+		},
+		{
+			"pass - block with tx - with ShouldIgnoreGasUsed - empty txs",
+			sdk.NewInt(1).BigInt(),
+			sdk.AccAddress(tests.GenerateAddress().Bytes()),
+			int64(1),
+			&tmrpctypes.ResultBlock{
+				Block: tmtypes.MakeBlock(1, []tmtypes.Tx{bz}, nil, nil),
+			},
+			&tmrpctypes.ResultBlockResults{
+				Height: 1,
+				TxsResults: []*types.ResponseDeliverTx{
+					{
+						Code:    11,
+						GasUsed: 0,
+						Log:     "no block gas left to run tx: out of gas",
+					},
+				},
+			},
+			true,
+			func(baseFee sdk.Int, validator sdk.AccAddress, height int64) {
+				queryClient := suite.backend.queryClient.QueryClient.(*mocks.QueryClient)
+				RegisterBaseFee(queryClient, baseFee)
+				RegisterValidatorAccount(queryClient, validator)
+
+				client := suite.backend.clientCtx.Client.(*mocks.Client)
+				RegisterConsensusParams(client, height)
+			},
+			false,
+			true,
+		},
+		{
+			"pass - block with tx - non fullTx",
+			sdk.NewInt(1).BigInt(),
+			sdk.AccAddress(tests.GenerateAddress().Bytes()),
+			int64(1),
+			&tmrpctypes.ResultBlock{
+				Block: tmtypes.MakeBlock(1, []tmtypes.Tx{bz}, nil, nil),
+			},
+			&tmrpctypes.ResultBlockResults{
+				Height:     1,
+				TxsResults: []*types.ResponseDeliverTx{{Code: 0, GasUsed: 0}},
+			},
+			false,
+			func(baseFee sdk.Int, validator sdk.AccAddress, height int64) {
+				queryClient := suite.backend.queryClient.QueryClient.(*mocks.QueryClient)
+				RegisterBaseFee(queryClient, baseFee)
+				RegisterValidatorAccount(queryClient, validator)
+
+				client := suite.backend.clientCtx.Client.(*mocks.Client)
+				RegisterConsensusParams(client, height)
+			},
+			true,
+			true,
+		},
+		{
+			"pass - block with tx",
+			sdk.NewInt(1).BigInt(),
+			sdk.AccAddress(tests.GenerateAddress().Bytes()),
+			int64(1),
+			&tmrpctypes.ResultBlock{
+				Block: tmtypes.MakeBlock(1, []tmtypes.Tx{bz}, nil, nil),
+			},
+			&tmrpctypes.ResultBlockResults{
+				Height:     1,
+				TxsResults: []*types.ResponseDeliverTx{{Code: 0, GasUsed: 0}},
+			},
+			true,
+			func(baseFee sdk.Int, validator sdk.AccAddress, height int64) {
+				queryClient := suite.backend.queryClient.QueryClient.(*mocks.QueryClient)
+				RegisterBaseFee(queryClient, baseFee)
+				RegisterValidatorAccount(queryClient, validator)
+
+				client := suite.backend.clientCtx.Client.(*mocks.Client)
+				RegisterConsensusParams(client, height)
+			},
+			true,
+			true,
+		},
+	}
+	for _, tc := range testCases {
+		suite.Run(fmt.Sprintf("Case %s", tc.name), func() {
+			suite.SetupTest() // reset test and queries
+			tc.registerMock(sdk.NewIntFromBigInt(tc.baseFee), tc.validator, tc.height)
+
+			block, err := suite.backend.EthBlockFromTendermint(tc.resBlock, tc.blockRes, tc.fullTx)
+
+			var expBlock map[string]interface{}
+			header := tc.resBlock.Block.Header
+			gasLimit := int64(^uint32(0)) // for `MaxGas = -1` (DefaultConsensusParams)
+			gasUsed := new(big.Int).SetUint64(uint64(tc.blockRes.TxsResults[0].GasUsed))
+
+			root := common.Hash{}.Bytes()
+			receipt := ethtypes.NewReceipt(root, false, gasUsed.Uint64())
+			bloom := ethtypes.CreateBloom(ethtypes.Receipts{receipt})
+
+			ethRPCTxs := []interface{}{}
+
+			if tc.expTxs {
+				if tc.fullTx {
+					rpcTx, err := ethrpc.NewRPCTransaction(
+						msgEthereumTx.AsTransaction(),
+						common.BytesToHash(header.Hash()),
+						uint64(header.Height),
+						uint64(0),
+						tc.baseFee,
+					)
+					suite.Require().NoError(err)
+					ethRPCTxs = []interface{}{rpcTx}
+				} else {
+					ethRPCTxs = []interface{}{common.HexToHash(msgEthereumTx.Hash)}
+				}
+			}
+
+			expBlock = ethrpc.FormatBlock(
+				header,
+				tc.resBlock.Block.Size(),
+				gasLimit,
+				gasUsed,
+				ethRPCTxs,
+				bloom,
+				common.BytesToAddress(tc.validator.Bytes()),
+				tc.baseFee,
+			)
+
+			if tc.expPass {
+				suite.Require().Equal(expBlock, block)
+				suite.Require().NoError(err)
+			} else {
+				suite.Require().Error(err)
+			}
+		})
+	}
+}
+
+func (suite *BackendTestSuite) TestBaseFee() {
+	baseFee := sdk.NewInt(1)
+
+	testCases := []struct {
+		name         string
+		blockRes     *tmrpctypes.ResultBlockResults
+		registerMock func()
+		expBaseFee   *big.Int
+		expPass      bool
+	}{
+		{
+			"fail - grpc BaseFee error",
+			&tmrpctypes.ResultBlockResults{Height: 1},
+			func() {
+				queryClient := suite.backend.queryClient.QueryClient.(*mocks.QueryClient)
+				RegisterBaseFeeError(queryClient)
+			},
+			nil,
+			false,
+		},
+		{
+			"fail - grpc BaseFee error - with non feemarket block event",
+			&tmrpctypes.ResultBlockResults{
+				Height: 1,
+				BeginBlockEvents: []types.Event{
+					{
+						Type: evmtypes.EventTypeBlockBloom,
+					},
+				},
+			},
+			func() {
+				queryClient := suite.backend.queryClient.QueryClient.(*mocks.QueryClient)
+				RegisterBaseFeeError(queryClient)
+			},
+			nil,
+			false,
+		},
+		{
+			"fail - grpc BaseFee error - with feemarket block event",
+			&tmrpctypes.ResultBlockResults{
+				Height: 1,
+				BeginBlockEvents: []types.Event{
+					{
+						Type: feemarkettypes.EventTypeFeeMarket,
+					},
+				},
+			},
+			func() {
+				queryClient := suite.backend.queryClient.QueryClient.(*mocks.QueryClient)
+				RegisterBaseFeeError(queryClient)
+			},
+			nil,
+			false,
+		},
+		{
+			"fail - grpc BaseFee error - with feemarket block event with wrong attribute value",
+			&tmrpctypes.ResultBlockResults{
+				Height: 1,
+				BeginBlockEvents: []types.Event{
+					{
+						Type: feemarkettypes.EventTypeFeeMarket,
+						Attributes: []types.EventAttribute{
+							{Value: []byte{0x1}},
+						},
+					},
+				},
+			},
+			func() {
+				queryClient := suite.backend.queryClient.QueryClient.(*mocks.QueryClient)
+				RegisterBaseFeeError(queryClient)
+			},
+			nil,
+			false,
+		},
+		{
+			"fail - grpc baseFee error - with feemarket block event with baseFee attribute value",
+			&tmrpctypes.ResultBlockResults{
+				Height: 1,
+				BeginBlockEvents: []types.Event{
+					{
+						Type: feemarkettypes.EventTypeFeeMarket,
+						Attributes: []types.EventAttribute{
+							{Value: []byte(baseFee.String())},
+						},
+					},
+				},
+			},
+			func() {
+				queryClient := suite.backend.queryClient.QueryClient.(*mocks.QueryClient)
+				RegisterBaseFeeError(queryClient)
+			},
+			baseFee.BigInt(),
+			true,
+		},
+		{
+			"fail - base fee or london fork not enabled",
+			&tmrpctypes.ResultBlockResults{Height: 1},
+			func() {
+				queryClient := suite.backend.queryClient.QueryClient.(*mocks.QueryClient)
+				RegisterBaseFeeDisabled(queryClient)
+			},
+			nil,
+			true,
+		},
+		{
+			"pass",
+			&tmrpctypes.ResultBlockResults{Height: 1},
+			func() {
+				queryClient := suite.backend.queryClient.QueryClient.(*mocks.QueryClient)
+				RegisterBaseFee(queryClient, baseFee)
+			},
+			baseFee.BigInt(),
+			true,
+		},
+	}
+	for _, tc := range testCases {
+		suite.Run(fmt.Sprintf("Case %s", tc.name), func() {
+			suite.SetupTest() // reset test and queries
+			tc.registerMock()
+
+			baseFee, err := suite.backend.BaseFee(tc.blockRes)
+
+			if tc.expPass {
+				suite.Require().NoError(err)
+				suite.Require().Equal(tc.expBaseFee, baseFee)
+			} else {
+				suite.Require().Error(err)
+			}
+		})
+	}
+}
+
+func (suite *BackendTestSuite) TestGetEthereumMsgsFromTendermintBlock() {
+	msgEthereumTx, bz := suite.buildEthereumTx()
+
+	testCases := []struct {
+		name     string
+		resBlock *tmrpctypes.ResultBlock
+		blockRes *tmrpctypes.ResultBlockResults
+		expMsgs  []*evmtypes.MsgEthereumTx
+	}{
+		{
+			"tx in not included in block - unsuccessful tx without ExceedBlockGasLimit error",
+			&tmrpctypes.ResultBlock{
+				Block: tmtypes.MakeBlock(1, []tmtypes.Tx{bz}, nil, nil),
+			},
+			&tmrpctypes.ResultBlockResults{
+				TxsResults: []*types.ResponseDeliverTx{
+					{
+						Code: 1,
+					},
+				},
+			},
+			[]*evmtypes.MsgEthereumTx(nil),
+		},
+		{
+			"tx included in block - unsuccessful tx with ExceedBlockGasLimit error",
+			&tmrpctypes.ResultBlock{
+				Block: tmtypes.MakeBlock(1, []tmtypes.Tx{bz}, nil, nil),
+			},
+			&tmrpctypes.ResultBlockResults{
+				TxsResults: []*types.ResponseDeliverTx{
+					{
+						Code: 1,
+						Log:  ExceedBlockGasLimitError,
+					},
+				},
+			},
+			[]*evmtypes.MsgEthereumTx{msgEthereumTx},
+		},
+		{
+			"pass",
+			&tmrpctypes.ResultBlock{
+				Block: tmtypes.MakeBlock(1, []tmtypes.Tx{bz}, nil, nil),
+			},
+			&tmrpctypes.ResultBlockResults{
+				TxsResults: []*types.ResponseDeliverTx{
+					{
+						Code: 0,
+						Log:  ExceedBlockGasLimitError,
+					},
+				},
+			},
+			[]*evmtypes.MsgEthereumTx{msgEthereumTx},
+		},
+	}
+	for _, tc := range testCases {
+		suite.Run(fmt.Sprintf("Case %s", tc.name), func() {
+
+			suite.SetupTest() // reset test and queries
+
+			msgs := suite.backend.GetEthereumMsgsFromTendermintBlock(tc.resBlock, tc.blockRes)
+			suite.Require().Equal(tc.expMsgs, msgs)
+		})
 	}
 }

rpc/backend/mocks/client.go

@@ -0,0 +1,841 @@
+// Code generated by mockery v2.14.0. DO NOT EDIT.
+
+package mocks
+
+import (
+	bytes "github.com/tendermint/tendermint/libs/bytes"
+	client "github.com/tendermint/tendermint/rpc/client"
+
+	context "context"
+
+	coretypes "github.com/tendermint/tendermint/rpc/core/types"
+
+	log "github.com/tendermint/tendermint/libs/log"
+
+	mock "github.com/stretchr/testify/mock"
+
+	types "github.com/tendermint/tendermint/types"
+)
+
+// Client is an autogenerated mock type for the Client type
+type Client struct {
+	mock.Mock
+}
+
+// ABCIInfo provides a mock function with given fields: _a0
+func (_m *Client) ABCIInfo(_a0 context.Context) (*coretypes.ResultABCIInfo, error) {
+	ret := _m.Called(_a0)
+
+	var r0 *coretypes.ResultABCIInfo
+	if rf, ok := ret.Get(0).(func(context.Context) *coretypes.ResultABCIInfo); ok {
+		r0 = rf(_a0)
+	} else {
+		if ret.Get(0) != nil {
+			r0 = ret.Get(0).(*coretypes.ResultABCIInfo)
+		}
+	}
+
+	var r1 error
+	if rf, ok := ret.Get(1).(func(context.Context) error); ok {
+		r1 = rf(_a0)
+	} else {
+		r1 = ret.Error(1)
+	}
+
+	return r0, r1
+}
+
+// ABCIQuery provides a mock function with given fields: ctx, path, data
+func (_m *Client) ABCIQuery(ctx context.Context, path string, data bytes.HexBytes) (*coretypes.ResultABCIQuery, error) {
+	ret := _m.Called(ctx, path, data)
+
+	var r0 *coretypes.ResultABCIQuery
+	if rf, ok := ret.Get(0).(func(context.Context, string, bytes.HexBytes) *coretypes.ResultABCIQuery); ok {
+		r0 = rf(ctx, path, data)
+	} else {
+		if ret.Get(0) != nil {
+			r0 = ret.Get(0).(*coretypes.ResultABCIQuery)
+		}
+	}
+
+	var r1 error
+	if rf, ok := ret.Get(1).(func(context.Context, string, bytes.HexBytes) error); ok {
+		r1 = rf(ctx, path, data)
+	} else {
+		r1 = ret.Error(1)
+	}
+
+	return r0, r1
+}
+
+// ABCIQueryWithOptions provides a mock function with given fields: ctx, path, data, opts
+func (_m *Client) ABCIQueryWithOptions(ctx context.Context, path string, data bytes.HexBytes, opts client.ABCIQueryOptions) (*coretypes.ResultABCIQuery, error) {
+	ret := _m.Called(ctx, path, data, opts)
+
+	var r0 *coretypes.ResultABCIQuery
+	if rf, ok := ret.Get(0).(func(context.Context, string, bytes.HexBytes, client.ABCIQueryOptions) *coretypes.ResultABCIQuery); ok {
+		r0 = rf(ctx, path, data, opts)
+	} else {
+		if ret.Get(0) != nil {
+			r0 = ret.Get(0).(*coretypes.ResultABCIQuery)
+		}
+	}
+
+	var r1 error
+	if rf, ok := ret.Get(1).(func(context.Context, string, bytes.HexBytes, client.ABCIQueryOptions) error); ok {
+		r1 = rf(ctx, path, data, opts)
+	} else {
+		r1 = ret.Error(1)
+	}
+
+	return r0, r1
+}
+
+// Block provides a mock function with given fields: ctx, height
+func (_m *Client) Block(ctx context.Context, height *int64) (*coretypes.ResultBlock, error) {
+	ret := _m.Called(ctx, height)
+
+	var r0 *coretypes.ResultBlock
+	if rf, ok := ret.Get(0).(func(context.Context, *int64) *coretypes.ResultBlock); ok {
+		r0 = rf(ctx, height)
+	} else {
+		if ret.Get(0) != nil {
+			r0 = ret.Get(0).(*coretypes.ResultBlock)
+		}
+	}
+
+	var r1 error
+	if rf, ok := ret.Get(1).(func(context.Context, *int64) error); ok {
+		r1 = rf(ctx, height)
+	} else {
+		r1 = ret.Error(1)
+	}
+
+	return r0, r1
+}
+
+// BlockByHash provides a mock function with given fields: ctx, hash
+func (_m *Client) BlockByHash(ctx context.Context, hash []byte) (*coretypes.ResultBlock, error) {
+	ret := _m.Called(ctx, hash)
+
+	var r0 *coretypes.ResultBlock
+	if rf, ok := ret.Get(0).(func(context.Context, []byte) *coretypes.ResultBlock); ok {
+		r0 = rf(ctx, hash)
+	} else {
+		if ret.Get(0) != nil {
+			r0 = ret.Get(0).(*coretypes.ResultBlock)
+		}
+	}
+
+	var r1 error
+	if rf, ok := ret.Get(1).(func(context.Context, []byte) error); ok {
+		r1 = rf(ctx, hash)
+	} else {
+		r1 = ret.Error(1)
+	}
+
+	return r0, r1
+}
+
+// BlockResults provides a mock function with given fields: ctx, height
+func (_m *Client) BlockResults(ctx context.Context, height *int64) (*coretypes.ResultBlockResults, error) {
+	ret := _m.Called(ctx, height)
+
+	var r0 *coretypes.ResultBlockResults
+	if rf, ok := ret.Get(0).(func(context.Context, *int64) *coretypes.ResultBlockResults); ok {
+		r0 = rf(ctx, height)
+	} else {
+		if ret.Get(0) != nil {
+			r0 = ret.Get(0).(*coretypes.ResultBlockResults)
+		}
+	}
+
+	var r1 error
+	if rf, ok := ret.Get(1).(func(context.Context, *int64) error); ok {
+		r1 = rf(ctx, height)
+	} else {
+		r1 = ret.Error(1)
+	}
+
+	return r0, r1
+}
+
+// BlockSearch provides a mock function with given fields: ctx, query, page, perPage, orderBy
+func (_m *Client) BlockSearch(ctx context.Context, query string, page *int, perPage *int, orderBy string) (*coretypes.ResultBlockSearch, error) {
+	ret := _m.Called(ctx, query, page, perPage, orderBy)
+
+	var r0 *coretypes.ResultBlockSearch
+	if rf, ok := ret.Get(0).(func(context.Context, string, *int, *int, string) *coretypes.ResultBlockSearch); ok {
+		r0 = rf(ctx, query, page, perPage, orderBy)
+	} else {
+		if ret.Get(0) != nil {
+			r0 = ret.Get(0).(*coretypes.ResultBlockSearch)
+		}
+	}
+
+	var r1 error
+	if rf, ok := ret.Get(1).(func(context.Context, string, *int, *int, string) error); ok {
+		r1 = rf(ctx, query, page, perPage, orderBy)
+	} else {
+		r1 = ret.Error(1)
+	}
+
+	return r0, r1
+}
+
+// BlockchainInfo provides a mock function with given fields: ctx, minHeight, maxHeight
+func (_m *Client) BlockchainInfo(ctx context.Context, minHeight int64, maxHeight int64) (*coretypes.ResultBlockchainInfo, error) {
+	ret := _m.Called(ctx, minHeight, maxHeight)
+
+	var r0 *coretypes.ResultBlockchainInfo
+	if rf, ok := ret.Get(0).(func(context.Context, int64, int64) *coretypes.ResultBlockchainInfo); ok {
+		r0 = rf(ctx, minHeight, maxHeight)
+	} else {
+		if ret.Get(0) != nil {
+			r0 = ret.Get(0).(*coretypes.ResultBlockchainInfo)
+		}
+	}
+
+	var r1 error
+	if rf, ok := ret.Get(1).(func(context.Context, int64, int64) error); ok {
+		r1 = rf(ctx, minHeight, maxHeight)
+	} else {
+		r1 = ret.Error(1)
+	}
+
+	return r0, r1
+}
+
+// BroadcastEvidence provides a mock function with given fields: _a0, _a1
+func (_m *Client) BroadcastEvidence(_a0 context.Context, _a1 types.Evidence) (*coretypes.ResultBroadcastEvidence, error) {
+	ret := _m.Called(_a0, _a1)
+
+	var r0 *coretypes.ResultBroadcastEvidence
+	if rf, ok := ret.Get(0).(func(context.Context, types.Evidence) *coretypes.ResultBroadcastEvidence); ok {
+		r0 = rf(_a0, _a1)
+	} else {
+		if ret.Get(0) != nil {
+			r0 = ret.Get(0).(*coretypes.ResultBroadcastEvidence)
+		}
+	}
+
+	var r1 error
+	if rf, ok := ret.Get(1).(func(context.Context, types.Evidence) error); ok {
+		r1 = rf(_a0, _a1)
+	} else {
+		r1 = ret.Error(1)
+	}
+
+	return r0, r1
+}
+
+// BroadcastTxAsync provides a mock function with given fields: _a0, _a1
+func (_m *Client) BroadcastTxAsync(_a0 context.Context, _a1 types.Tx) (*coretypes.ResultBroadcastTx, error) {
+	ret := _m.Called(_a0, _a1)
+
+	var r0 *coretypes.ResultBroadcastTx
+	if rf, ok := ret.Get(0).(func(context.Context, types.Tx) *coretypes.ResultBroadcastTx); ok {
+		r0 = rf(_a0, _a1)
+	} else {
+		if ret.Get(0) != nil {
+			r0 = ret.Get(0).(*coretypes.ResultBroadcastTx)
+		}
+	}
+
+	var r1 error
+	if rf, ok := ret.Get(1).(func(context.Context, types.Tx) error); ok {
+		r1 = rf(_a0, _a1)
+	} else {
+		r1 = ret.Error(1)
+	}
+
+	return r0, r1
+}
+
+// BroadcastTxCommit provides a mock function with given fields: _a0, _a1
+func (_m *Client) BroadcastTxCommit(_a0 context.Context, _a1 types.Tx) (*coretypes.ResultBroadcastTxCommit, error) {
+	ret := _m.Called(_a0, _a1)
+
+	var r0 *coretypes.ResultBroadcastTxCommit
+	if rf, ok := ret.Get(0).(func(context.Context, types.Tx) *coretypes.ResultBroadcastTxCommit); ok {
+		r0 = rf(_a0, _a1)
+	} else {
+		if ret.Get(0) != nil {
+			r0 = ret.Get(0).(*coretypes.ResultBroadcastTxCommit)
+		}
+	}
+
+	var r1 error
+	if rf, ok := ret.Get(1).(func(context.Context, types.Tx) error); ok {
+		r1 = rf(_a0, _a1)
+	} else {
+		r1 = ret.Error(1)
+	}
+
+	return r0, r1
+}
+
+// BroadcastTxSync provides a mock function with given fields: _a0, _a1
+func (_m *Client) BroadcastTxSync(_a0 context.Context, _a1 types.Tx) (*coretypes.ResultBroadcastTx, error) {
+	ret := _m.Called(_a0, _a1)
+
+	var r0 *coretypes.ResultBroadcastTx
+	if rf, ok := ret.Get(0).(func(context.Context, types.Tx) *coretypes.ResultBroadcastTx); ok {
+		r0 = rf(_a0, _a1)
+	} else {
+		if ret.Get(0) != nil {
+			r0 = ret.Get(0).(*coretypes.ResultBroadcastTx)
+		}
+	}
+
+	var r1 error
+	if rf, ok := ret.Get(1).(func(context.Context, types.Tx) error); ok {
+		r1 = rf(_a0, _a1)
+	} else {
+		r1 = ret.Error(1)
+	}
+
+	return r0, r1
+}
+
+// CheckTx provides a mock function with given fields: _a0, _a1
+func (_m *Client) CheckTx(_a0 context.Context, _a1 types.Tx) (*coretypes.ResultCheckTx, error) {
+	ret := _m.Called(_a0, _a1)
+
+	var r0 *coretypes.ResultCheckTx
+	if rf, ok := ret.Get(0).(func(context.Context, types.Tx) *coretypes.ResultCheckTx); ok {
+		r0 = rf(_a0, _a1)
+	} else {
+		if ret.Get(0) != nil {
+			r0 = ret.Get(0).(*coretypes.ResultCheckTx)
+		}
+	}
+
+	var r1 error
+	if rf, ok := ret.Get(1).(func(context.Context, types.Tx) error); ok {
+		r1 = rf(_a0, _a1)
+	} else {
+		r1 = ret.Error(1)
+	}
+
+	return r0, r1
+}
+
+// Commit provides a mock function with given fields: ctx, height
+func (_m *Client) Commit(ctx context.Context, height *int64) (*coretypes.ResultCommit, error) {
+	ret := _m.Called(ctx, height)
+
+	var r0 *coretypes.ResultCommit
+	if rf, ok := ret.Get(0).(func(context.Context, *int64) *coretypes.ResultCommit); ok {
+		r0 = rf(ctx, height)
+	} else {
+		if ret.Get(0) != nil {
+			r0 = ret.Get(0).(*coretypes.ResultCommit)
+		}
+	}
+
+	var r1 error
+	if rf, ok := ret.Get(1).(func(context.Context, *int64) error); ok {
+		r1 = rf(ctx, height)
+	} else {
+		r1 = ret.Error(1)
+	}
+
+	return r0, r1
+}
+
+// ConsensusParams provides a mock function with given fields: ctx, height
+func (_m *Client) ConsensusParams(ctx context.Context, height *int64) (*coretypes.ResultConsensusParams, error) {
+	ret := _m.Called(ctx, height)
+
+	var r0 *coretypes.ResultConsensusParams
+	if rf, ok := ret.Get(0).(func(context.Context, *int64) *coretypes.ResultConsensusParams); ok {
+		r0 = rf(ctx, height)
+	} else {
+		if ret.Get(0) != nil {
+			r0 = ret.Get(0).(*coretypes.ResultConsensusParams)
+		}
+	}
+
+	var r1 error
+	if rf, ok := ret.Get(1).(func(context.Context, *int64) error); ok {
+		r1 = rf(ctx, height)
+	} else {
+		r1 = ret.Error(1)
+	}
+
+	return r0, r1
+}
+
+// ConsensusState provides a mock function with given fields: _a0
+func (_m *Client) ConsensusState(_a0 context.Context) (*coretypes.ResultConsensusState, error) {
+	ret := _m.Called(_a0)
+
+	var r0 *coretypes.ResultConsensusState
+	if rf, ok := ret.Get(0).(func(context.Context) *coretypes.ResultConsensusState); ok {
+		r0 = rf(_a0)
+	} else {
+		if ret.Get(0) != nil {
+			r0 = ret.Get(0).(*coretypes.ResultConsensusState)
+		}
+	}
+
+	var r1 error
+	if rf, ok := ret.Get(1).(func(context.Context) error); ok {
+		r1 = rf(_a0)
+	} else {
+		r1 = ret.Error(1)
+	}
+
+	return r0, r1
+}
+
+// DumpConsensusState provides a mock function with given fields: _a0
+func (_m *Client) DumpConsensusState(_a0 context.Context) (*coretypes.ResultDumpConsensusState, error) {
+	ret := _m.Called(_a0)
+
+	var r0 *coretypes.ResultDumpConsensusState
+	if rf, ok := ret.Get(0).(func(context.Context) *coretypes.ResultDumpConsensusState); ok {
+		r0 = rf(_a0)
+	} else {
+		if ret.Get(0) != nil {
+			r0 = ret.Get(0).(*coretypes.ResultDumpConsensusState)
+		}
+	}
+
+	var r1 error
+	if rf, ok := ret.Get(1).(func(context.Context) error); ok {
+		r1 = rf(_a0)
+	} else {
+		r1 = ret.Error(1)
+	}
+
+	return r0, r1
+}
+
+// Genesis provides a mock function with given fields: _a0
+func (_m *Client) Genesis(_a0 context.Context) (*coretypes.ResultGenesis, error) {
+	ret := _m.Called(_a0)
+
+	var r0 *coretypes.ResultGenesis
+	if rf, ok := ret.Get(0).(func(context.Context) *coretypes.ResultGenesis); ok {
+		r0 = rf(_a0)
+	} else {
+		if ret.Get(0) != nil {
+			r0 = ret.Get(0).(*coretypes.ResultGenesis)
+		}
+	}
+
+	var r1 error
+	if rf, ok := ret.Get(1).(func(context.Context) error); ok {
+		r1 = rf(_a0)
+	} else {
+		r1 = ret.Error(1)
+	}
+
+	return r0, r1
+}
+
+// GenesisChunked provides a mock function with given fields: _a0, _a1
+func (_m *Client) GenesisChunked(_a0 context.Context, _a1 uint) (*coretypes.ResultGenesisChunk, error) {
+	ret := _m.Called(_a0, _a1)
+
+	var r0 *coretypes.ResultGenesisChunk
+	if rf, ok := ret.Get(0).(func(context.Context, uint) *coretypes.ResultGenesisChunk); ok {
+		r0 = rf(_a0, _a1)
+	} else {
+		if ret.Get(0) != nil {
+			r0 = ret.Get(0).(*coretypes.ResultGenesisChunk)
+		}
+	}
+
+	var r1 error
+	if rf, ok := ret.Get(1).(func(context.Context, uint) error); ok {
+		r1 = rf(_a0, _a1)
+	} else {
+		r1 = ret.Error(1)
+	}
+
+	return r0, r1
+}
+
+// Health provides a mock function with given fields: _a0
+func (_m *Client) Health(_a0 context.Context) (*coretypes.ResultHealth, error) {
+	ret := _m.Called(_a0)
+
+	var r0 *coretypes.ResultHealth
+	if rf, ok := ret.Get(0).(func(context.Context) *coretypes.ResultHealth); ok {
+		r0 = rf(_a0)
+	} else {
+		if ret.Get(0) != nil {
+			r0 = ret.Get(0).(*coretypes.ResultHealth)
+		}
+	}
+
+	var r1 error
+	if rf, ok := ret.Get(1).(func(context.Context) error); ok {
+		r1 = rf(_a0)
+	} else {
+		r1 = ret.Error(1)
+	}
+
+	return r0, r1
+}
+
+// IsRunning provides a mock function with given fields:
+func (_m *Client) IsRunning() bool {
+	ret := _m.Called()
+
+	var r0 bool
+	if rf, ok := ret.Get(0).(func() bool); ok {
+		r0 = rf()
+	} else {
+		r0 = ret.Get(0).(bool)
+	}
+
+	return r0
+}
+
+// NetInfo provides a mock function with given fields: _a0
+func (_m *Client) NetInfo(_a0 context.Context) (*coretypes.ResultNetInfo, error) {
+	ret := _m.Called(_a0)
+
+	var r0 *coretypes.ResultNetInfo
+	if rf, ok := ret.Get(0).(func(context.Context) *coretypes.ResultNetInfo); ok {
+		r0 = rf(_a0)
+	} else {
+		if ret.Get(0) != nil {
+			r0 = ret.Get(0).(*coretypes.ResultNetInfo)
+		}
+	}
+
+	var r1 error
+	if rf, ok := ret.Get(1).(func(context.Context) error); ok {
+		r1 = rf(_a0)
+	} else {
+		r1 = ret.Error(1)
+	}
+
+	return r0, r1
+}
+
+// NumUnconfirmedTxs provides a mock function with given fields: _a0
+func (_m *Client) NumUnconfirmedTxs(_a0 context.Context) (*coretypes.ResultUnconfirmedTxs, error) {
+	ret := _m.Called(_a0)
+
+	var r0 *coretypes.ResultUnconfirmedTxs
+	if rf, ok := ret.Get(0).(func(context.Context) *coretypes.ResultUnconfirmedTxs); ok {
+		r0 = rf(_a0)
+	} else {
+		if ret.Get(0) != nil {
+			r0 = ret.Get(0).(*coretypes.ResultUnconfirmedTxs)
+		}
+	}
+
+	var r1 error
+	if rf, ok := ret.Get(1).(func(context.Context) error); ok {
+		r1 = rf(_a0)
+	} else {
+		r1 = ret.Error(1)
+	}
+
+	return r0, r1
+}
+
+// OnReset provides a mock function with given fields:
+func (_m *Client) OnReset() error {
+	ret := _m.Called()
+
+	var r0 error
+	if rf, ok := ret.Get(0).(func() error); ok {
+		r0 = rf()
+	} else {
+		r0 = ret.Error(0)
+	}
+
+	return r0
+}
+
+// OnStart provides a mock function with given fields:
+func (_m *Client) OnStart() error {
+	ret := _m.Called()
+
+	var r0 error
+	if rf, ok := ret.Get(0).(func() error); ok {
+		r0 = rf()
+	} else {
+		r0 = ret.Error(0)
+	}
+
+	return r0
+}
+
+// OnStop provides a mock function with given fields:
+func (_m *Client) OnStop() {
+	_m.Called()
+}
+
+// Quit provides a mock function with given fields:
+func (_m *Client) Quit() <-chan struct{} {
+	ret := _m.Called()
+
+	var r0 <-chan struct{}
+	if rf, ok := ret.Get(0).(func() <-chan struct{}); ok {
+		r0 = rf()
+	} else {
+		if ret.Get(0) != nil {
+			r0 = ret.Get(0).(<-chan struct{})
+		}
+	}
+
+	return r0
+}
+
+// Reset provides a mock function with given fields:
+func (_m *Client) Reset() error {
+	ret := _m.Called()
+
+	var r0 error
+	if rf, ok := ret.Get(0).(func() error); ok {
+		r0 = rf()
+	} else {
+		r0 = ret.Error(0)
+	}
+
+	return r0
+}
+
+// SetLogger provides a mock function with given fields: _a0
+func (_m *Client) SetLogger(_a0 log.Logger) {
+	_m.Called(_a0)
+}
+
+// Start provides a mock function with given fields:
+func (_m *Client) Start() error {
+	ret := _m.Called()
+
+	var r0 error
+	if rf, ok := ret.Get(0).(func() error); ok {
+		r0 = rf()
+	} else {
+		r0 = ret.Error(0)
+	}
+
+	return r0
+}
+
+// Status provides a mock function with given fields: _a0
+func (_m *Client) Status(_a0 context.Context) (*coretypes.ResultStatus, error) {
+	ret := _m.Called(_a0)
+
+	var r0 *coretypes.ResultStatus
+	if rf, ok := ret.Get(0).(func(context.Context) *coretypes.ResultStatus); ok {
+		r0 = rf(_a0)
+	} else {
+		if ret.Get(0) != nil {
+			r0 = ret.Get(0).(*coretypes.ResultStatus)
+		}
+	}
+
+	var r1 error
+	if rf, ok := ret.Get(1).(func(context.Context) error); ok {
+		r1 = rf(_a0)
+	} else {
+		r1 = ret.Error(1)
+	}
+
+	return r0, r1
+}
+
+// Stop provides a mock function with given fields:
+func (_m *Client) Stop() error {
+	ret := _m.Called()
+
+	var r0 error
+	if rf, ok := ret.Get(0).(func() error); ok {
+		r0 = rf()
+	} else {
+		r0 = ret.Error(0)
+	}
+
+	return r0
+}
+
+// String provides a mock function with given fields:
+func (_m *Client) String() string {
+	ret := _m.Called()
+
+	var r0 string
+	if rf, ok := ret.Get(0).(func() string); ok {
+		r0 = rf()
+	} else {
+		r0 = ret.Get(0).(string)
+	}
+
+	return r0
+}
+
+// Subscribe provides a mock function with given fields: ctx, subscriber, query, outCapacity
+func (_m *Client) Subscribe(ctx context.Context, subscriber string, query string, outCapacity ...int) (<-chan coretypes.ResultEvent, error) {
+	_va := make([]interface{}, len(outCapacity))
+	for _i := range outCapacity {
+		_va[_i] = outCapacity[_i]
+	}
+	var _ca []interface{}
+	_ca = append(_ca, ctx, subscriber, query)
+	_ca = append(_ca, _va...)
+	ret := _m.Called(_ca...)
+
+	var r0 <-chan coretypes.ResultEvent
+	if rf, ok := ret.Get(0).(func(context.Context, string, string, ...int) <-chan coretypes.ResultEvent); ok {
+		r0 = rf(ctx, subscriber, query, outCapacity...)
+	} else {
+		if ret.Get(0) != nil {
+			r0 = ret.Get(0).(<-chan coretypes.ResultEvent)
+		}
+	}
+
+	var r1 error
+	if rf, ok := ret.Get(1).(func(context.Context, string, string, ...int) error); ok {
+		r1 = rf(ctx, subscriber, query, outCapacity...)
+	} else {
+		r1 = ret.Error(1)
+	}
+
+	return r0, r1
+}
+
+// Tx provides a mock function with given fields: ctx, hash, prove
+func (_m *Client) Tx(ctx context.Context, hash []byte, prove bool) (*coretypes.ResultTx, error) {
+	ret := _m.Called(ctx, hash, prove)
+
+	var r0 *coretypes.ResultTx
+	if rf, ok := ret.Get(0).(func(context.Context, []byte, bool) *coretypes.ResultTx); ok {
+		r0 = rf(ctx, hash, prove)
+	} else {
+		if ret.Get(0) != nil {
+			r0 = ret.Get(0).(*coretypes.ResultTx)
+		}
+	}
+
+	var r1 error
+	if rf, ok := ret.Get(1).(func(context.Context, []byte, bool) error); ok {
+		r1 = rf(ctx, hash, prove)
+	} else {
+		r1 = ret.Error(1)
+	}
+
+	return r0, r1
+}
+
+// TxSearch provides a mock function with given fields: ctx, query, prove, page, perPage, orderBy
+func (_m *Client) TxSearch(ctx context.Context, query string, prove bool, page *int, perPage *int, orderBy string) (*coretypes.ResultTxSearch, error) {
+	ret := _m.Called(ctx, query, prove, page, perPage, orderBy)
+
+	var r0 *coretypes.ResultTxSearch
+	if rf, ok := ret.Get(0).(func(context.Context, string, bool, *int, *int, string) *coretypes.ResultTxSearch); ok {
+		r0 = rf(ctx, query, prove, page, perPage, orderBy)
+	} else {
+		if ret.Get(0) != nil {
+			r0 = ret.Get(0).(*coretypes.ResultTxSearch)
+		}
+	}
+
+	var r1 error
+	if rf, ok := ret.Get(1).(func(context.Context, string, bool, *int, *int, string) error); ok {
+		r1 = rf(ctx, query, prove, page, perPage, orderBy)
+	} else {
+		r1 = ret.Error(1)
+	}
+
+	return r0, r1
+}
+
+// UnconfirmedTxs provides a mock function with given fields: ctx, limit
+func (_m *Client) UnconfirmedTxs(ctx context.Context, limit *int) (*coretypes.ResultUnconfirmedTxs, error) {
+	ret := _m.Called(ctx, limit)
+
+	var r0 *coretypes.ResultUnconfirmedTxs
+	if rf, ok := ret.Get(0).(func(context.Context, *int) *coretypes.ResultUnconfirmedTxs); ok {
+		r0 = rf(ctx, limit)
+	} else {
+		if ret.Get(0) != nil {
+			r0 = ret.Get(0).(*coretypes.ResultUnconfirmedTxs)
+		}
+	}
+
+	var r1 error
+	if rf, ok := ret.Get(1).(func(context.Context, *int) error); ok {
+		r1 = rf(ctx, limit)
+	} else {
+		r1 = ret.Error(1)
+	}
+
+	return r0, r1
+}
+
+// Unsubscribe provides a mock function with given fields: ctx, subscriber, query
+func (_m *Client) Unsubscribe(ctx context.Context, subscriber string, query string) error {
+	ret := _m.Called(ctx, subscriber, query)
+
+	var r0 error
+	if rf, ok := ret.Get(0).(func(context.Context, string, string) error); ok {
+		r0 = rf(ctx, subscriber, query)
+	} else {
+		r0 = ret.Error(0)
+	}
+
+	return r0
+}
+
+// UnsubscribeAll provides a mock function with given fields: ctx, subscriber
+func (_m *Client) UnsubscribeAll(ctx context.Context, subscriber string) error {
+	ret := _m.Called(ctx, subscriber)
+
+	var r0 error
+	if rf, ok := ret.Get(0).(func(context.Context, string) error); ok {
+		r0 = rf(ctx, subscriber)
+	} else {
+		r0 = ret.Error(0)
+	}
+
+	return r0
+}
+
+// Validators provides a mock function with given fields: ctx, height, page, perPage
+func (_m *Client) Validators(ctx context.Context, height *int64, page *int, perPage *int) (*coretypes.ResultValidators, error) {
+	ret := _m.Called(ctx, height, page, perPage)
+
+	var r0 *coretypes.ResultValidators
+	if rf, ok := ret.Get(0).(func(context.Context, *int64, *int, *int) *coretypes.ResultValidators); ok {
+		r0 = rf(ctx, height, page, perPage)
+	} else {
+		if ret.Get(0) != nil {
+			r0 = ret.Get(0).(*coretypes.ResultValidators)
+		}
+	}
+
+	var r1 error
+	if rf, ok := ret.Get(1).(func(context.Context, *int64, *int, *int) error); ok {
+		r1 = rf(ctx, height, page, perPage)
+	} else {
+		r1 = ret.Error(1)
+	}
+
+	return r0, r1
+}
+
+type mockConstructorTestingTNewClient interface {
+	mock.TestingT
+	Cleanup(func())
+}
+
+// NewClient creates a new instance of Client. It also registers a testing interface on the mock and a cleanup function to assert the mocks expectations.
+func NewClient(t mockConstructorTestingTNewClient) *Client {
+	mock := &Client{}
+	mock.Mock.Test(t)
+
+	t.Cleanup(func() { mock.AssertExpectations(t) })
+
+	return mock
+}

rpc/backend/query_client_test.go

@@ -0,0 +1,160 @@
+package backend
+
+import (
+	"fmt"
+	"strconv"
+	"testing"
+
+	sdk "github.com/cosmos/cosmos-sdk/types"
+	sdkerrors "github.com/cosmos/cosmos-sdk/types/errors"
+	grpctypes "github.com/cosmos/cosmos-sdk/types/grpc"
+	"github.com/evmos/ethermint/rpc/backend/mocks"
+	rpc "github.com/evmos/ethermint/rpc/types"
+	"github.com/evmos/ethermint/tests"
+	evmtypes "github.com/evmos/ethermint/x/evm/types"
+	mock "github.com/stretchr/testify/mock"
+	"github.com/stretchr/testify/require"
+	"google.golang.org/grpc"
+	"google.golang.org/grpc/codes"
+	"google.golang.org/grpc/metadata"
+	"google.golang.org/grpc/status"
+)
+
+// QueryClient defines a mocked object that implements the ethermint GRPC
+// QueryClient interface. It allows for performing QueryClient queries without having
+// to run a ethermint GRPC server.
+//
+// To use a mock method it has to be registered in a given test.
+var _ evmtypes.QueryClient = &mocks.QueryClient{}
+
+// Params
+func RegisterParams(queryClient *mocks.QueryClient, header *metadata.MD, height int64) {
+	queryClient.On("Params", rpc.ContextWithHeight(height), &evmtypes.QueryParamsRequest{}, grpc.Header(header)).
+		Return(&evmtypes.QueryParamsResponse{}, nil).
+		Run(func(args mock.Arguments) {
+			// If Params call is successful, also update the header height
+			arg := args.Get(2).(grpc.HeaderCallOption)
+			h := metadata.MD{}
+			h.Set(grpctypes.GRPCBlockHeightHeader, fmt.Sprint(height))
+			*arg.HeaderAddr = h
+		})
+}
+
+func RegisterParamsInvalidHeader(queryClient *mocks.QueryClient, header *metadata.MD, height int64) {
+	queryClient.On("Params", rpc.ContextWithHeight(height), &evmtypes.QueryParamsRequest{}, grpc.Header(header)).
+		Return(&evmtypes.QueryParamsResponse{}, nil).
+		Run(func(args mock.Arguments) {
+			// If Params call is successful, also update the header height
+			arg := args.Get(2).(grpc.HeaderCallOption)
+			h := metadata.MD{}
+			*arg.HeaderAddr = h
+		})
+}
+
+func RegisterParamsInvalidHeight(queryClient *mocks.QueryClient, header *metadata.MD, height int64) {
+	queryClient.On("Params", rpc.ContextWithHeight(height), &evmtypes.QueryParamsRequest{}, grpc.Header(header)).
+		Return(&evmtypes.QueryParamsResponse{}, nil).
+		Run(func(args mock.Arguments) {
+			// If Params call is successful, also update the header height
+			arg := args.Get(2).(grpc.HeaderCallOption)
+			h := metadata.MD{}
+			h.Set(grpctypes.GRPCBlockHeightHeader, "invalid")
+			*arg.HeaderAddr = h
+		})
+}
+
+// Params returns error
+func RegisterParamsError(queryClient *mocks.QueryClient, header *metadata.MD, height int64) {
+	queryClient.On("Params", rpc.ContextWithHeight(height), &evmtypes.QueryParamsRequest{}, grpc.Header(header)).
+		Return(nil, sdkerrors.ErrInvalidRequest)
+}
+
+func TestRegisterParams(t *testing.T) {
+	queryClient := mocks.NewQueryClient(t)
+	var header metadata.MD
+	height := int64(1)
+	RegisterParams(queryClient, &header, height)
+
+	_, err := queryClient.Params(rpc.ContextWithHeight(height), &evmtypes.QueryParamsRequest{}, grpc.Header(&header))
+	require.NoError(t, err)
+	blockHeightHeader := header.Get(grpctypes.GRPCBlockHeightHeader)
+	headerHeight, err := strconv.ParseInt(blockHeightHeader[0], 10, 64)
+	require.NoError(t, err)
+	require.Equal(t, height, headerHeight)
+}
+
+func TestRegisterParamsError(t *testing.T) {
+	queryClient := mocks.NewQueryClient(t)
+	RegisterBaseFeeError(queryClient)
+	_, err := queryClient.BaseFee(rpc.ContextWithHeight(1), &evmtypes.QueryBaseFeeRequest{})
+	require.Error(t, err)
+}
+
+// BaseFee
+func RegisterBaseFee(queryClient *mocks.QueryClient, baseFee sdk.Int) {
+	queryClient.On("BaseFee", rpc.ContextWithHeight(1), &evmtypes.QueryBaseFeeRequest{}).
+		Return(&evmtypes.QueryBaseFeeResponse{BaseFee: &baseFee}, nil)
+}
+
+// Base fee returns error
+func RegisterBaseFeeError(queryClient *mocks.QueryClient) {
+	queryClient.On("BaseFee", rpc.ContextWithHeight(1), &evmtypes.QueryBaseFeeRequest{}).
+		Return(&evmtypes.QueryBaseFeeResponse{}, evmtypes.ErrInvalidBaseFee)
+}
+
+// Base fee not enabled
+func RegisterBaseFeeDisabled(queryClient *mocks.QueryClient) {
+	queryClient.On("BaseFee", rpc.ContextWithHeight(1), &evmtypes.QueryBaseFeeRequest{}).
+		Return(&evmtypes.QueryBaseFeeResponse{}, nil)
+}
+
+func TestRegisterBaseFee(t *testing.T) {
+	baseFee := sdk.NewInt(1)
+	queryClient := mocks.NewQueryClient(t)
+	RegisterBaseFee(queryClient, baseFee)
+	res, err := queryClient.BaseFee(rpc.ContextWithHeight(1), &evmtypes.QueryBaseFeeRequest{})
+	require.Equal(t, &evmtypes.QueryBaseFeeResponse{BaseFee: &baseFee}, res)
+	require.NoError(t, err)
+}
+
+func TestRegisterBaseFeeError(t *testing.T) {
+	queryClient := mocks.NewQueryClient(t)
+	RegisterBaseFeeError(queryClient)
+	res, err := queryClient.BaseFee(rpc.ContextWithHeight(1), &evmtypes.QueryBaseFeeRequest{})
+	require.Equal(t, &evmtypes.QueryBaseFeeResponse{}, res)
+	require.Error(t, err)
+}
+
+func TestRegisterBaseFeeDisabled(t *testing.T) {
+	queryClient := mocks.NewQueryClient(t)
+	RegisterBaseFeeDisabled(queryClient)
+	res, err := queryClient.BaseFee(rpc.ContextWithHeight(1), &evmtypes.QueryBaseFeeRequest{})
+	require.Equal(t, &evmtypes.QueryBaseFeeResponse{}, res)
+	require.NoError(t, err)
+}
+
+// ValidatorAccount
+func RegisterValidatorAccount(queryClient *mocks.QueryClient, validator sdk.AccAddress) {
+	queryClient.On("ValidatorAccount", rpc.ContextWithHeight(1), &evmtypes.QueryValidatorAccountRequest{}).
+		Return(
+			&evmtypes.QueryValidatorAccountResponse{
+				AccountAddress: validator.String(),
+			},
+			nil,
+		)
+}
+
+func RegisterValidatorAccountError(queryClient *mocks.QueryClient) {
+	queryClient.On("ValidatorAccount", rpc.ContextWithHeight(1), &evmtypes.QueryValidatorAccountRequest{}).
+		Return(nil, status.Error(codes.InvalidArgument, "empty request"))
+}
+
+func TestRegisterValidatorAccount(t *testing.T) {
+	queryClient := mocks.NewQueryClient(t)
+
+	validator := sdk.AccAddress(tests.GenerateAddress().Bytes())
+	RegisterValidatorAccount(queryClient, validator)
+	res, err := queryClient.ValidatorAccount(rpc.ContextWithHeight(1), &evmtypes.QueryValidatorAccountRequest{})
+	require.Equal(t, &evmtypes.QueryValidatorAccountResponse{AccountAddress: validator.String()}, res)
+	require.NoError(t, err)
+}

rpc/backend/utils.go

@@ -380,7 +380,8 @@ func TxExceedBlockGasLimit(res *abci.ResponseDeliverTx) bool {
 	return strings.Contains(res.Log, ExceedBlockGasLimitError)
 }
 
-// TxSuccessOrExceedsBlockGasLimit returns if the tx should be included in json-rpc responses
+// TxSuccessOrExceedsBlockGasLimit returnsrue if the transaction was successful
+// or if it failed with an ExceedBlockGasLimit error
 func TxSuccessOrExceedsBlockGasLimit(res *abci.ResponseDeliverTx) bool {
 	return res.Code == 0 || TxExceedBlockGasLimit(res)
 }

rpc/namespaces/ethereum/eth/api.go

@@ -12,7 +12,6 @@ import (
 	"github.com/ethereum/go-ethereum/signer/core/apitypes"
 
 	"github.com/ethereum/go-ethereum/core/vm"
-	"github.com/ethereum/go-ethereum/params"
 	"github.com/ethereum/go-ethereum/rpc"
 	"google.golang.org/grpc/codes"
 	"google.golang.org/grpc/status"
@@ -38,6 +37,7 @@ import (
 
 	"github.com/evmos/ethermint/crypto/hd"
 	"github.com/evmos/ethermint/rpc/backend"
+
 	rpctypes "github.com/evmos/ethermint/rpc/types"
 	ethermint "github.com/evmos/ethermint/types"
 	evmtypes "github.com/evmos/ethermint/x/evm/types"
@@ -583,26 +583,6 @@ func (e *PublicAPI) SendRawTransaction(data hexutil.Bytes) (common.Hash, error)
 	return txHash, nil
 }
 
-// checkTxFee is an internal function used to check whether the fee of
-// the given transaction is _reasonable_(under the cap).
-func checkTxFee(gasPrice *big.Int, gas uint64, cap float64) error {
-	// Short circuit if there is no cap for transaction fee at all.
-	if cap == 0 {
-		return nil
-	}
-	totalfee := new(big.Float).SetInt(new(big.Int).Mul(gasPrice, new(big.Int).SetUint64(gas)))
-	// 1 photon in 10^18 aphoton
-	oneToken := new(big.Float).SetInt(big.NewInt(params.Ether))
-	// quo = rounded(x/y)
-	feeEth := new(big.Float).Quo(totalfee, oneToken)
-	// no need to check error from parsing
-	feeFloat, _ := feeEth.Float64()
-	if feeFloat > cap {
-		return fmt.Errorf("tx fee (%.2f ether) exceeds the configured cap (%.2f ether)", feeFloat, cap)
-	}
-	return nil
-}
-
 // Resend accepts an existing transaction and a new gas price and limit. It will remove
 // the given transaction from the pool and reinsert it with the new gas price and limit.
 func (e *PublicAPI) Resend(ctx context.Context, args evmtypes.TransactionArgs, gasPrice *hexutil.Big, gasLimit *hexutil.Uint64) (common.Hash, error) {
@@ -627,7 +607,7 @@ func (e *PublicAPI) Resend(ctx context.Context, args evmtypes.TransactionArgs, g
 	if gasLimit != nil {
 		gas = uint64(*gasLimit)
 	}
-	if err := checkTxFee(price, gas, e.backend.RPCTxFeeCap()); err != nil {
+	if err := rpctypes.CheckTxFee(price, gas, e.backend.RPCTxFeeCap()); err != nil {
 		return common.Hash{}, err
 	}
 
@@ -757,6 +737,42 @@ func (e *PublicAPI) GetTransactionByHash(hash common.Hash) (*rpctypes.RPCTransac
 	return e.backend.GetTransactionByHash(hash)
 }
 
+// GetTransactionByBlockHashAndIndex returns the transaction identified by hash and index.
+func (e *PublicAPI) GetTransactionByBlockHashAndIndex(hash common.Hash, idx hexutil.Uint) (*rpctypes.RPCTransaction, error) {
+	e.logger.Debug("eth_getTransactionByBlockHashAndIndex", "hash", hash.Hex(), "index", idx)
+
+	block, err := e.clientCtx.Client.BlockByHash(e.ctx, hash.Bytes())
+	if err != nil {
+		e.logger.Debug("block not found", "hash", hash.Hex(), "error", err.Error())
+		return nil, nil
+	}
+
+	if block.Block == nil {
+		e.logger.Debug("block not found", "hash", hash.Hex())
+		return nil, nil
+	}
+
+	return e.getTransactionByBlockAndIndex(block, idx)
+}
+
+// GetTransactionByBlockNumberAndIndex returns the transaction identified by number and index.
+func (e *PublicAPI) GetTransactionByBlockNumberAndIndex(blockNum rpctypes.BlockNumber, idx hexutil.Uint) (*rpctypes.RPCTransaction, error) {
+	e.logger.Debug("eth_getTransactionByBlockNumberAndIndex", "number", blockNum, "index", idx)
+
+	block, err := e.backend.GetTendermintBlockByNumber(blockNum)
+	if err != nil {
+		e.logger.Debug("block not found", "height", blockNum.Int64(), "error", err.Error())
+		return nil, nil
+	}
+
+	if block.Block == nil {
+		e.logger.Debug("block not found", "height", blockNum.Int64())
+		return nil, nil
+	}
+
+	return e.getTransactionByBlockAndIndex(block, idx)
+}
+
 // getTransactionByBlockAndIndex is the common code shared by `GetTransactionByBlockNumberAndIndex` and `GetTransactionByBlockHashAndIndex`.
 func (e *PublicAPI) getTransactionByBlockAndIndex(block *tmrpctypes.ResultBlock, idx hexutil.Uint) (*rpctypes.RPCTransaction, error) {
 	blockRes, err := e.backend.GetTendermintBlockResultByNumber(&block.Block.Height)
@@ -817,42 +833,6 @@ func (e *PublicAPI) getTransactionByBlockAndIndex(block *tmrpctypes.ResultBlock,
 	)
 }
 
-// GetTransactionByBlockHashAndIndex returns the transaction identified by hash and index.
-func (e *PublicAPI) GetTransactionByBlockHashAndIndex(hash common.Hash, idx hexutil.Uint) (*rpctypes.RPCTransaction, error) {
-	e.logger.Debug("eth_getTransactionByBlockHashAndIndex", "hash", hash.Hex(), "index", idx)
-
-	block, err := e.clientCtx.Client.BlockByHash(e.ctx, hash.Bytes())
-	if err != nil {
-		e.logger.Debug("block not found", "hash", hash.Hex(), "error", err.Error())
-		return nil, nil
-	}
-
-	if block.Block == nil {
-		e.logger.Debug("block not found", "hash", hash.Hex())
-		return nil, nil
-	}
-
-	return e.getTransactionByBlockAndIndex(block, idx)
-}
-
-// GetTransactionByBlockNumberAndIndex returns the transaction identified by number and index.
-func (e *PublicAPI) GetTransactionByBlockNumberAndIndex(blockNum rpctypes.BlockNumber, idx hexutil.Uint) (*rpctypes.RPCTransaction, error) {
-	e.logger.Debug("eth_getTransactionByBlockNumberAndIndex", "number", blockNum, "index", idx)
-
-	block, err := e.backend.GetTendermintBlockByNumber(blockNum)
-	if err != nil {
-		e.logger.Debug("block not found", "height", blockNum.Int64(), "error", err.Error())
-		return nil, nil
-	}
-
-	if block.Block == nil {
-		e.logger.Debug("block not found", "height", blockNum.Int64())
-		return nil, nil
-	}
-
-	return e.getTransactionByBlockAndIndex(block, idx)
-}
-
 // GetTransactionReceipt returns the transaction receipt identified by hash.
 func (e *PublicAPI) GetTransactionReceipt(hash common.Hash) (map[string]interface{}, error) {
 	hexTx := hash.Hex()

rpc/types/utils.go

@@ -19,6 +19,7 @@ import (
 	"github.com/ethereum/go-ethereum/common/hexutil"
 	"github.com/ethereum/go-ethereum/common/math"
 	ethtypes "github.com/ethereum/go-ethereum/core/types"
+	"github.com/ethereum/go-ethereum/params"
 )
 
 // RawTxToEthTx returns a evm MsgEthereum transaction from raw tx bytes.
@@ -222,3 +223,23 @@ func BaseFeeFromEvents(events []abci.Event) *big.Int {
 	}
 	return nil
 }
+
+// CheckTxFee is an internal function used to check whether the fee of
+// the given transaction is _reasonable_(under the cap).
+func CheckTxFee(gasPrice *big.Int, gas uint64, cap float64) error {
+	// Short circuit if there is no cap for transaction fee at all.
+	if cap == 0 {
+		return nil
+	}
+	totalfee := new(big.Float).SetInt(new(big.Int).Mul(gasPrice, new(big.Int).SetUint64(gas)))
+	// 1 photon in 10^18 aphoton
+	oneToken := new(big.Float).SetInt(big.NewInt(params.Ether))
+	// quo = rounded(x/y)
+	feeEth := new(big.Float).Quo(totalfee, oneToken)
+	// no need to check error from parsing
+	feeFloat, _ := feeEth.Float64()
+	if feeFloat > cap {
+		return fmt.Errorf("tx fee (%.2f ether) exceeds the configured cap (%.2f ether)", feeFloat, cap)
+	}
+	return nil
+}

x/evm/keeper/grpc_query.go

@@ -89,6 +89,7 @@ func (k Keeper) CosmosAccount(c context.Context, req *types.QueryCosmosAccountRe
 	return &res, nil
 }
 
+// ValidatorAccount implements the Query/Balance gRPC method
 func (k Keeper) ValidatorAccount(c context.Context, req *types.QueryValidatorAccountRequest) (*types.QueryValidatorAccountResponse, error) {
 	if req == nil {
 		return nil, status.Error(codes.InvalidArgument, "empty request")