test relayer reward redemption

addresses review comment #139 (comment)

Author: feuGeneA

tests/add_fee_amount.go

@@ -100,4 +100,8 @@ func AddFeeAmount(network network.Network) {
 		subnetAInfo.TeleporterMessenger.CheckRelayerRewardAmount(&bind.CallOpts{}, fundedAddress, mockTokenAddress)
 	Expect(err).Should(BeNil())
 	Expect(amount).Should(Equal(additionalFeeAmount.Add(additionalFeeAmount, initFeeAmount)))
+
+	utils.RedeemRelayerRewardsAndConfirm(
+		ctx, subnetAInfo, mockToken, mockTokenAddress, fundedKey, amount,
+	)
 }

tests/basic_send_receive.go

@@ -8,6 +8,7 @@ import (
 	teleportermessenger "github.com/ava-labs/teleporter/abi-bindings/go/Teleporter/TeleporterMessenger"
 	"github.com/ava-labs/teleporter/tests/network"
 	"github.com/ava-labs/teleporter/tests/utils"
+	localUtils "github.com/ava-labs/teleporter/tests/utils/local-network-utils"
 	"github.com/ethereum/go-ethereum/common"
 	. "github.com/onsi/gomega"
 )
@@ -25,19 +26,36 @@ func BasicSendReceive(network network.Network) {
 	subnets := network.GetSubnetsInfo()
 	subnetAInfo := subnets[0]
 	subnetBInfo := subnets[1]
+	teleporterContractAddress := network.GetTeleporterContractAddress()
 	fundedAddress, fundedKey := network.GetFundedAccountInfo()
 
 	//
 	// Send a transaction to Subnet A to issue a Warp Message from the Teleporter contract to Subnet B
 	//
 	ctx := context.Background()
 
+	feeAmount := big.NewInt(1)
+	feeTokenAddress, feeToken := localUtils.DeployExampleERC20(
+		ctx,
+		fundedKey,
+		subnetAInfo,
+	)
+	localUtils.ExampleERC20Approve(
+		ctx,
+		feeToken,
+		teleporterContractAddress,
+		big.NewInt(0).Mul(big.NewInt(1e18),
+			big.NewInt(10)),
+		subnetAInfo,
+		fundedKey,
+	)
+
 	sendCrossChainMessageInput := teleportermessenger.TeleporterMessageInput{
 		DestinationChainID: subnetBInfo.BlockchainID,
 		DestinationAddress: fundedAddress,
 		FeeInfo: teleportermessenger.TeleporterFeeInfo{
-			FeeTokenAddress: fundedAddress,
-			Amount:          big.NewInt(0),
+			FeeTokenAddress: feeTokenAddress,
+			Amount:          feeAmount,
 		},
 		RequiredGasLimit:        big.NewInt(1),
 		AllowedRelayerAddresses: []common.Address{},
@@ -71,7 +89,9 @@ func BasicSendReceive(network network.Network) {
 	//
 	// Send a transaction to Subnet B to issue a Warp Message from the Teleporter contract to Subnet A
 	//
+
 	sendCrossChainMessageInput.DestinationChainID = subnetAInfo.BlockchainID
+	sendCrossChainMessageInput.FeeInfo.Amount = big.NewInt(0)
 	receipt, teleporterMessageID = utils.SendCrossChainMessageAndWaitForAcceptance(
 		ctx,
 		subnetBInfo,
@@ -94,4 +114,8 @@ func BasicSendReceive(network network.Network) {
 	)
 	Expect(err).Should(BeNil())
 	Expect(delivered).Should(BeTrue())
+
+	utils.RedeemRelayerRewardsAndConfirm(
+		ctx, subnetAInfo, feeToken, feeTokenAddress, fundedKey, feeAmount,
+	)
 }

tests/utils/utils.go

@@ -20,6 +20,7 @@ import (
 	"github.com/ava-labs/subnet-evm/params"
 	predicateutils "github.com/ava-labs/subnet-evm/predicate"
 	"github.com/ava-labs/subnet-evm/x/warp"
+	exampleerc20 "github.com/ava-labs/teleporter/abi-bindings/go/Mocks/ExampleERC20"
 	teleportermessenger "github.com/ava-labs/teleporter/abi-bindings/go/Teleporter/TeleporterMessenger"
 	gasUtils "github.com/ava-labs/teleporter/utils/gas-utils"
 	"github.com/ethereum/go-ethereum/common"
@@ -159,6 +160,49 @@ func RetryMessageExecutionAndWaitForAcceptance(
 	return receipt
 }
 
+func RedeemRelayerRewardsAndConfirm(
+	ctx context.Context,
+	subnet SubnetTestInfo,
+	feeToken *exampleerc20.ExampleERC20,
+	feeTokenAddress common.Address,
+	relayerKey *ecdsa.PrivateKey,
+	expectedAmount *big.Int,
+) *types.Receipt {
+	relayerAddress := crypto.PubkeyToAddress(relayerKey.PublicKey)
+
+	balanceBeforeRedemption, err := feeToken.BalanceOf(
+		&bind.CallOpts{}, relayerAddress,
+	)
+	Expect(err).Should(BeNil())
+
+	tx_opts, err := bind.NewKeyedTransactorWithChainID(
+		relayerKey, subnet.ChainIDInt,
+	)
+	Expect(err).Should(BeNil())
+	transaction, err := subnet.TeleporterMessenger.RedeemRelayerRewards(
+		tx_opts, feeTokenAddress,
+	)
+	Expect(err).Should(BeNil())
+	receipt, err := bind.WaitMined(ctx, subnet.ChainRPCClient, transaction)
+	Expect(err).Should(BeNil())
+	Expect(receipt.Status).Should(Equal(types.ReceiptStatusSuccessful))
+
+	balanceAfterRedemption, err := feeToken.BalanceOf(
+		&bind.CallOpts{}, relayerAddress,
+	)
+	Expect(err).Should(BeNil())
+
+	Expect(balanceAfterRedemption).Should(
+		Equal(
+			big.NewInt(0).Add(
+				balanceBeforeRedemption, expectedAmount,
+			),
+		),
+	)
+
+	return receipt
+}
+
 func SendSpecifiedReceiptsAndWaitForAcceptance(
 	ctx context.Context,
 	originChainID ids.ID,