first batch of reviews

precompiles/types/address.go

@@ -1,6 +1,8 @@
 package types
 
 import (
+	"errors"
+
 	sdk "github.com/cosmos/cosmos-sdk/types"
 	bank "github.com/cosmos/cosmos-sdk/x/bank/keeper"
 	"github.com/ethereum/go-ethereum/common"
@@ -12,6 +14,10 @@ import (
 // If contract.CallerAddress != evm.Origin is true, it means the call was made through a contract,
 // on which case there is a need to set the caller to the evm.Origin.
 func GetEVMCallerAddress(evm *vm.EVM, contract *vm.Contract) (common.Address, error) {
+	if evm == nil || contract == nil {
+		return common.Address{}, errors.New("invalid input: evm or contract is nil")
+	}
+
 	caller := contract.CallerAddress
 	if contract.CallerAddress != evm.Origin {
 		caller = evm.Origin

precompiles/types/address_test.go

@@ -11,9 +11,41 @@ import (
 )
 
 func Test_GetEVMCallerAddress(t *testing.T) {
+	t.Run("should raise error when evm is nil", func(t *testing.T) {
+		_, mockVMContract := setupMockEVMAndContract(common.Address{})
+		caller, err := GetEVMCallerAddress(nil, &mockVMContract)
+		require.Error(t, err)
+		require.Equal(t, common.Address{}, caller, "address should be zeroed")
+	})
+
+	t.Run("should raise error when contract is nil", func(t *testing.T) {
+		mockEVM, _ := setupMockEVMAndContract(common.Address{})
+		caller, err := GetEVMCallerAddress(&mockEVM, nil)
+		require.Error(t, err)
+		require.Equal(t, common.Address{}, caller, "address should be zeroed")
+	})
+
+	// When contract.CallerAddress == evm.Origin, caller is set to contract.CallerAddress.
+	t.Run("when caller address equals origin", func(t *testing.T) {
+		mockEVM, mockVMContract := setupMockEVMAndContract(common.Address{})
+		caller, err := GetEVMCallerAddress(&mockEVM, &mockVMContract)
+		require.NoError(t, err)
+		require.Equal(t, common.Address{}, caller, "address should be the same")
+	})
+
+	// When contract.CallerAddress != evm.Origin, caller should be set to evm.Origin.
+	t.Run("when caller address equals origin", func(t *testing.T) {
+		mockEVM, mockVMContract := setupMockEVMAndContract(sample.EthAddress())
+		caller, err := GetEVMCallerAddress(&mockEVM, &mockVMContract)
+		require.NoError(t, err)
+		require.Equal(t, mockEVM.Origin, caller, "address should be evm.Origin")
+	})
+}
+
+func setupMockEVMAndContract(address common.Address) (vm.EVM, vm.Contract) {
 	mockEVM := vm.EVM{
 		TxContext: vm.TxContext{
-			Origin: common.Address{},
+			Origin: address,
 		},
 	}
 
@@ -24,16 +56,7 @@ func Test_GetEVMCallerAddress(t *testing.T) {
 		0,
 	)
 
-	// When contract.CallerAddress == evm.Origin, caller is set to contract.CallerAddress.
-	caller, err := GetEVMCallerAddress(&mockEVM, mockVMContract)
-	require.NoError(t, err)
-	require.Equal(t, common.Address{}, caller, "address shouldn be the same")
-
-	// When contract.CallerAddress != evm.Origin, caller should be set to evm.Origin.
-	mockEVM.Origin = sample.EthAddress()
-	caller, err = GetEVMCallerAddress(&mockEVM, mockVMContract)
-	require.NoError(t, err)
-	require.Equal(t, mockEVM.Origin, caller, "address should be evm.Origin")
+	return mockEVM, *mockVMContract
 }
 
 type contractRef struct {

precompiles/types/coin.go

@@ -11,12 +11,18 @@ import (
 const ZRC20DenomPrefix = "zrc20/"
 
 // ZRC20ToCosmosDenom returns the cosmos coin address for a given ZRC20 address.
-// This is converted to "zevm/{ZRC20Address}".
+// This is converted to "zrc20/{ZRC20Address}".
 func ZRC20ToCosmosDenom(ZRC20Address common.Address) string {
 	return ZRC20DenomPrefix + ZRC20Address.String()
 }
 
 func CreateCoinSet(tokenDenom string, amount *big.Int) (sdk.Coins, error) {
+	defer func() {
+		if r := recover(); r != nil {
+			return
+		}
+	}()
+
 	coin := sdk.NewCoin(tokenDenom, math.NewIntFromBigInt(amount))
 	if !coin.IsValid() {
 		return nil, &ErrInvalidCoin{