Add aux contracts and helper functions for evm tests

core/tests/ts-integration/contracts/create/TestEVMCreate.sol

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+// SPDX-License-Identifier: MIT
+
+pragma solidity ^0.8.0;
+
+interface IContractDeployer {
+    function evmCodeHash(address key) external returns (bytes32);
+
+    function createEVM(
+        bytes calldata _initCode
+    ) external payable returns (address newAddress);
+
+    function create2EVM(
+        bytes32 _salt,
+        bytes calldata _initCode
+    ) external payable returns (address);
+}
+
+/// @notice An example of a system contract that be used for local testing.
+/// @dev It is not used anywhere except for testing
+contract TestEVMCreate {
+    IContractDeployer deployer = IContractDeployer(address(0x8006));
+
+    function create(bytes calldata _code) external {
+        deployer.createEVM(_code);
+    }
+
+    function create2(bytes32 _salt, bytes calldata _code) external payable {
+        deployer.create2EVM{value:msg.value}(_salt, _code);
+    }
+}

core/tests/ts-integration/contracts/token/ERC20.sol

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+// SPDX-License-Identifier: UNLICENSED
+
+pragma solidity ^0.8.0;
+
+contract ERC20{
+    string public symbol;
+    string public  name;
+    uint8 public decimals;
+    uint public totalSupply;
+
+    mapping(address => uint) balances;
+    mapping(address => mapping(address => uint)) allowed;
+
+    event Transfer(address indexed _from, address indexed _to, uint256 _value);
+    event Approval(address indexed _owner, address indexed _spender, uint256 _value);
+
+    constructor() {
+        symbol = "TEST";
+        name = "Test Coin";
+        decimals = 18;
+        totalSupply = 1000000;
+        balances[msg.sender] = totalSupply;
+        emit Transfer(address(0), msg.sender, totalSupply);
+    }
+
+
+    function balanceOf(address tokenOwner) public view returns (uint balance) {
+        return balances[tokenOwner];
+    }
+
+    function transfer(address to, uint tokens) public returns (bool success) {
+        balances[msg.sender] = safeSub(balances[msg.sender], tokens);
+        balances[to] = safeAdd(balances[to], tokens);
+        emit Transfer(msg.sender, to, tokens);
+        return true;
+    }
+
+    function approve(address spender, uint tokens) public returns (bool success) {
+        allowed[msg.sender][spender] = tokens;
+        emit Approval(msg.sender, spender, tokens);
+        return true;
+    }
+
+    function transferFrom(address from, address to, uint tokens) public returns (bool success) {
+        balances[from] = safeSub(balances[from], tokens);
+        allowed[from][msg.sender] = safeSub(allowed[from][msg.sender], tokens);
+        balances[to] = safeAdd(balances[to], tokens);
+        emit Transfer(from, to, tokens);
+        return true;
+    }
+
+    function allowance(address tokenOwner, address spender) public view returns (uint remaining) {
+        return allowed[tokenOwner][spender];
+    }
+
+    function safeAdd(uint a, uint b) internal pure returns (uint c) {
+        c = a + b;
+        require(c >= a);
+    }
+
+    function safeSub(uint a, uint b) internal pure returns (uint c) {
+        require(b <= a);
+        c = a - b;
+    }
+
+    function safeMul(uint a, uint b) internal pure returns (uint c) {
+        c = a * b;
+        require(a == 0 || c / a == b);
+    }
+
+    function safeDiv(uint a, uint b) internal pure returns (uint c) {
+        require(b > 0);
+        c = a / b;
+    }
+
+}