feat: move L1Assets.sol from wiki to wasp repo

packages/evm/evmtest/wiki_how_tos/L1Assets.abi

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+[{"inputs":[{"components":[{"internalType":"bytes","name":"data","type":"bytes"}],"internalType":"struct L1Address","name":"to","type":"tuple"}],"name":"withdraw","outputs":[],"stateMutability":"nonpayable","type":"function"}]

packages/evm/evmtest/wiki_how_tos/L1Assets.bin

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packages/evm/evmtest/wiki_how_tos/L1Assets.sol

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+// SPDX-License-Identifier: MIT
+
+pragma solidity ^0.8.0;
+
+import "@iscmagic/ISC.sol";
+
+contract L1Assets {
+  function withdraw(L1Address memory to) public {
+    ISCAssets memory allowance = ISC.sandbox.getAllowanceFrom(msg.sender);
+    ISC.sandbox.takeAllowedFunds(msg.sender, allowance);
+
+    ISCSendMetadata memory metadata;
+    ISCSendOptions memory options;
+    ISC.sandbox.send(to, allowance, false, metadata, options);
+  }
+}

packages/evm/evmtest/wiki_how_tos/L1_assets_test.go

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+package wiki_how_tos_test
+
+import (
+    _ "embed"
+    "math/big"
+    "strings"
+    "testing"
+
+    "github.com/ethereum/go-ethereum/common"
+    "github.com/stretchr/testify/assert"
+    "github.com/stretchr/testify/require"
+
+    "github.com/iotaledger/wasp/packages/isc"
+    "github.com/iotaledger/wasp/packages/solo"
+    "github.com/iotaledger/wasp/packages/vm/core/evm/evmtest"
+)
+
+//go:generate sh -c "solc --abi --bin --overwrite @iscmagic=`realpath ../../../vm/core/evm/iscmagic` L1Assets.sol -o ."
+var (
+    //go:embed L1Assets.abi
+    L1AssetsContractABI string
+    //go:embed L1Assets.bin
+    L1AssetsContractBytecodeHex string
+    L1AssetsContractBytecode = common.FromHex(strings.TrimSpace(L1AssetsContractBytecodeHex))
+)
+
+func TestWithdraw(t *testing.T) {
+    env := evmtest.InitEVMWithSolo(t, solo.New(t), true)
+    privateKey, deployer := env.Chain.NewEthereumAccountWithL2Funds()
+
+    instance := env.DeployContract(privateKey, L1AssetsContractABI, L1AssetsContractBytecode)
+
+    // Define a mock L1 address for withdrawal
+    recipientAddress := common.HexToAddress("0x1234567890Abcdef1234567890Abcdef12345678")
+
+    // Mock the allowance that would be returned by ISC.sandbox.getAllowanceFrom
+    mockAllowance := isc.NewEmptyAssets()
+    mockAllowance.AddBaseTokens(1000)
+
+    // Call the withdraw function and expect an event (assuming "Withdrawn" event)
+    var withdrawnEvent struct {
+        To common.Address
+        Amount *big.Int
+    }
+    result, err := instance.CallFnExpectEvent(nil, "Withdrawn", &withdrawnEvent, "withdraw", recipientAddress)
+    require.NoError(t, err)
+
+    // Verify the event
+    assert.Equal(t, recipientAddress, withdrawnEvent.To, "Recipient address should match")
+    assert.Equal(t, mockAllowance.BaseTokens(), withdrawnEvent.Amount.Uint64(), "Withdrawn amount should match the allowance")
+
+    // Get the transaction hash from the result
+    txHash := result.GetTxHash()
+    require.NotNil(t, txHash)
+
+    // Wait for the transaction to be confirmed
+    receipt, err := env.Chain.EVM().TransactionReceipt(txHash)
+    require.NoError(t, err)
+    assert.Equal(t, receipt.Status, uint64(1), "Transaction should be successful")
+
+    // Additional check: Ensure deployer still has funds
+    balance, err := env.Chain.EVM().Balance(deployer, nil)
+    require.NoError(t, err)
+    assert.True(t, balance.Sign() > 0, "Deployer should still have a positive balance")
+}