chore: migrate E2E nonStandardErc20 tests to Foundry (#213)

## Description

Migrate nonStandardErc20 e2e test to foundry. Depends on
`FoundryTest.sol` introduced in #215

## Test Plan

CI

## Related Issues

Closes #138

Author: meetmangukiya

test/e2e/NonStandardErc20.t.sol

@@ -0,0 +1,157 @@
+// SPDX-License-Identifier: LGPL-3.0-or-later
+pragma solidity ^0.8;
+
+import {Vm} from "forge-std/Vm.sol";
+
+import {Helper} from "./Helper.sol";
+import {IERC20} from "src/contracts/interfaces/IERC20.sol";
+
+import {GPv2Order, GPv2Signing, SettlementEncoder} from "../libraries/encoders/SettlementEncoder.sol";
+import {Registry, TokenRegistry} from "../libraries/encoders/TokenRegistry.sol";
+
+abstract contract NonStandardERC20 {
+    mapping(address => uint256) public balanceOf;
+    mapping(address => mapping(address => uint256)) public allowance;
+
+    function mint(address to, uint256 amount) external {
+        balanceOf[to] += amount;
+    }
+
+    function approve(address spender, uint256 amount) external {
+        allowance[msg.sender][spender] = amount;
+    }
+
+    function transfer_(address to, uint256 amount) internal {
+        balanceOf[msg.sender] -= amount;
+        balanceOf[to] += amount;
+    }
+
+    function transferFrom_(address from, address to, uint256 amount) internal {
+        allowance[from][msg.sender] -= amount;
+        balanceOf[from] -= amount;
+        balanceOf[to] += amount;
+    }
+}
+
+contract ERC20NoReturn is NonStandardERC20 {
+    function transfer(address to, uint256 amount) external {
+        transfer_(to, amount);
+    }
+
+    function transferFrom(address from, address to, uint256 amount) external {
+        transferFrom_(from, to, amount);
+    }
+}
+
+contract ERC20ReturningUint is NonStandardERC20 {
+    // Largest 256-bit prime :)
+    uint256 private constant OK = 115792089237316195423570985008687907853269984665640564039457584007913129639747;
+
+    function transfer(address to, uint256 amount) external returns (uint256) {
+        transfer_(to, amount);
+        return OK;
+    }
+
+    function transferFrom(address from, address to, uint256 amount) external returns (uint256) {
+        transferFrom_(from, to, amount);
+        return OK;
+    }
+}
+
+using SettlementEncoder for SettlementEncoder.State;
+using TokenRegistry for TokenRegistry.State;
+using TokenRegistry for Registry;
+
+contract NonStandardErc20Test is Helper(false) {
+    ERC20NoReturn noReturnToken;
+    ERC20ReturningUint uintReturningToken;
+
+    function setUp() public override {
+        super.setUp();
+
+        noReturnToken = new ERC20NoReturn();
+        uintReturningToken = new ERC20ReturningUint();
+    }
+
+    function test_should_allow_trading_non_standard_erc20_tokens() external {
+        uint256 amount = 1 ether;
+        uint256 feeAmount = 0.01 ether;
+
+        Vm.Wallet memory trader1 = vm.createWallet("trader1");
+        Vm.Wallet memory trader2 = vm.createWallet("trader2");
+
+        // mint some noReturnToken tokens to trader1
+        noReturnToken.mint(trader1.addr, amount + feeAmount);
+        vm.prank(trader1.addr);
+        noReturnToken.approve(vaultRelayer, type(uint256).max);
+        // place order to swap noReturnToken for uintReturningToken
+        encoder.signEncodeTrade(
+            vm,
+            trader1,
+            GPv2Order.Data({
+                sellToken: IERC20(address(noReturnToken)),
+                buyToken: IERC20(address(uintReturningToken)),
+                receiver: trader1.addr,
+                sellAmount: amount,
+                buyAmount: amount,
+                validTo: 0xffffffff,
+                appData: bytes32(uint256(1)),
+                feeAmount: feeAmount,
+                kind: GPv2Order.KIND_SELL,
+                partiallyFillable: false,
+                sellTokenBalance: GPv2Order.BALANCE_ERC20,
+                buyTokenBalance: GPv2Order.BALANCE_ERC20
+            }),
+            domainSeparator,
+            GPv2Signing.Scheme.Eip712,
+            0
+        );
+
+        // mint some uintReturningToken tokens to trader2
+        uintReturningToken.mint(trader2.addr, amount + feeAmount);
+        vm.prank(trader2.addr);
+        uintReturningToken.approve(vaultRelayer, type(uint256).max);
+        // place order to swap uintReturningToken for noReturnToken
+        encoder.signEncodeTrade(
+            vm,
+            trader2,
+            GPv2Order.Data({
+                sellToken: IERC20(address(uintReturningToken)),
+                buyToken: IERC20(address(noReturnToken)),
+                receiver: trader2.addr,
+                sellAmount: amount,
+                buyAmount: amount,
+                validTo: 0xffffffff,
+                appData: bytes32(uint256(2)),
+                feeAmount: feeAmount,
+                kind: GPv2Order.KIND_BUY,
+                partiallyFillable: false,
+                sellTokenBalance: GPv2Order.BALANCE_ERC20,
+                buyTokenBalance: GPv2Order.BALANCE_ERC20
+            }),
+            domainSeparator,
+            GPv2Signing.Scheme.Eip712,
+            0
+        );
+
+        // set token prices
+        IERC20[] memory tokens = new IERC20[](2);
+        tokens[0] = IERC20(address(noReturnToken));
+        tokens[1] = IERC20(address(uintReturningToken));
+        uint256[] memory prices = new uint256[](2);
+        prices[0] = 1;
+        prices[1] = 1;
+        encoder.tokenRegistry.tokenRegistry().setPrices(tokens, prices);
+
+        // settle the orders
+        SettlementEncoder.EncodedSettlement memory encodedSettlement = encoder.encode(settlement);
+        vm.prank(solver);
+        settle(encodedSettlement);
+
+        assertEq(noReturnToken.balanceOf(address(settlement)), feeAmount, "order1 fee not charged as expected");
+        assertEq(noReturnToken.balanceOf(trader2.addr), amount, "order1 swap output not as expected");
+
+        assertEq(uintReturningToken.balanceOf(address(settlement)), feeAmount, "order2 fee not charged as expected");
+        assertEq(uintReturningToken.balanceOf(trader1.addr), amount, "order2 swap output not as expected");
+    }
+}