tests: add ibc test cases (#63)

* add basic test cases for ibc middleware v1, v2

more test cases will be added.

* add test cases for ibc middleware v2

* add test cases for ibc middleware v1 and post state check

* add OnAcknowledgementPacket tc for v1 ibc middleware

* add OnTimeoutPacket tc for v1 ibc middleware

* chore: unify variable names

* use internal testing pkg and add TestOnRecvPacketNativeErc20 tc

* add v1 tcs for handling erc20 native coin

OnTimeoutPacket, OnAcknowledgementPacket

* refactor v1 middleware test codes

* apply gci

* fix ci: receiver name should be same

* fix ci: unify receiver name

and also update comments and variable name

* fix ci: run gofumpt and remove tc copy

* test: update TestOnRecvPacket

make sure whether it is registered as dynamic precompiled contract or not

* chore: test suite name convention

Author: zsystm

Diff for: tests/ibc/helper.go

@@ -0,0 +1,92 @@
+package ibc
+
+import (
+	"math/big"
+	"testing"
+
+	"github.com/ethereum/go-ethereum/accounts/abi"
+	"github.com/ethereum/go-ethereum/common"
+
+	"github.com/cosmos/evm/contracts"
+	"github.com/cosmos/evm/evmd"
+	evmibctesting "github.com/cosmos/evm/ibc/testing"
+	erc20types "github.com/cosmos/evm/x/erc20/types"
+	ibctesting "github.com/cosmos/ibc-go/v10/testing"
+
+	authtypes "github.com/cosmos/cosmos-sdk/x/auth/types"
+	banktypes "github.com/cosmos/cosmos-sdk/x/bank/types"
+	govtypes "github.com/cosmos/cosmos-sdk/x/gov/types"
+)
+
+// NativeErc20Info holds details about a deployed ERC20 token.
+type NativeErc20Info struct {
+	Denom        string
+	ContractAbi  abi.ABI
+	ContractAddr common.Address
+	Account      common.Address // The address of the minter on the EVM chain
+	InitialBal   *big.Int
+}
+
+// SetupNativeErc20 deploys, registers, and mints a native ERC20 token on an EVM-based chain.
+func SetupNativeErc20(t *testing.T, chain *evmibctesting.TestChain) *NativeErc20Info {
+	t.Helper()
+
+	evmCtx := chain.GetContext()
+	evmApp := chain.App.(*evmd.EVMD)
+
+	// Deploy new ERC20 contract with default metadata
+	contractAddr, err := evmApp.Erc20Keeper.DeployERC20Contract(evmCtx, banktypes.Metadata{
+		DenomUnits: []*banktypes.DenomUnit{
+			{Denom: "example", Exponent: 18},
+		},
+		Name:   "Example",
+		Symbol: "Ex",
+	})
+	if err != nil {
+		t.Fatalf("ERC20 deployment failed: %v", err)
+	}
+	chain.NextBlock()
+
+	// Register the contract
+	_, err = evmApp.Erc20Keeper.RegisterERC20(evmCtx, &erc20types.MsgRegisterERC20{
+		Authority:      authtypes.NewModuleAddress(govtypes.ModuleName).String(),
+		Erc20Addresses: []string{contractAddr.Hex()},
+	})
+	if err != nil {
+		t.Fatalf("RegisterERC20 failed: %v", err)
+	}
+
+	// Mint tokens to default sender
+	contractAbi := contracts.ERC20MinterBurnerDecimalsContract.ABI
+	nativeDenom := erc20types.CreateDenom(contractAddr.String())
+	sendAmt := ibctesting.DefaultCoinAmount
+	senderAcc := chain.SenderAccount.GetAddress()
+
+	_, err = evmApp.EVMKeeper.CallEVM(
+		evmCtx,
+		contractAbi,
+		erc20types.ModuleAddress,
+		contractAddr,
+		true,
+		"mint",
+		common.BytesToAddress(senderAcc),
+		big.NewInt(sendAmt.Int64()),
+	)
+	if err != nil {
+		t.Fatalf("mint call failed: %v", err)
+	}
+
+	// Verify minted balance
+	bal := evmApp.Erc20Keeper.BalanceOf(evmCtx, contractAbi, contractAddr, common.BytesToAddress(senderAcc))
+	if bal.Cmp(big.NewInt(sendAmt.Int64())) != 0 {
+		t.Fatalf("unexpected ERC20 balance; got %s, want %s", bal.String(), sendAmt.String())
+	}
+
+	return &NativeErc20Info{
+		Denom:        nativeDenom,
+		ContractAbi:  contractAbi,
+		ContractAddr: contractAddr,
+		Account:      common.BytesToAddress(senderAcc),
+		InitialBal:   big.NewInt(sendAmt.Int64()),
+	}
+}