add TokenTransferTest contract to validate token transfer functionality

Author: cqlyj

test/no-fork/TokenTransferTest.t.sol

@@ -0,0 +1,67 @@
+// SPDX-License-Identifier: MIT
+pragma solidity 0.8.26;
+
+import {Test} from "forge-std/Test.sol";
+import {AmoyTokenTransfer} from "src/AmoyTokenTransfer.sol";
+import {CCIPLocalSimulator, IRouterClient, LinkToken, BurnMintERC677Helper} from "@chainlink/local/src/ccip/CCIPLocalSimulator.sol";
+import {TokenReceiverMock} from "test/no-fork/mocks/TokenReceiverMock.sol";
+
+contract TokenTransferTest is Test {
+    CCIPLocalSimulator public ccipLocalSimulator;
+    uint64 public destinationChainSelector;
+    AmoyTokenTransfer public amoyTokenTransfer;
+    TokenReceiverMock public tokenReceiverMock;
+    BurnMintERC677Helper public CCIPBnM;
+
+    uint256 constant AMOUNT_LINK_REQUEST = 20 ether;
+    uint256 constant AMOUNT_CCIPBNM = 1e18;
+
+    address public USER = makeAddr("USER");
+
+    function setUp() public {
+        ccipLocalSimulator = new CCIPLocalSimulator();
+        (
+            uint64 chainSelector,
+            IRouterClient sourceRouter,
+            ,
+            ,
+            LinkToken linkToken,
+            BurnMintERC677Helper ccipBnM,
+
+        ) = ccipLocalSimulator.configuration();
+
+        destinationChainSelector = chainSelector;
+        CCIPBnM = ccipBnM;
+
+        amoyTokenTransfer = new AmoyTokenTransfer(
+            address(sourceRouter),
+            address(linkToken)
+        );
+
+        tokenReceiverMock = new TokenReceiverMock();
+        deal(address(CCIPBnM), USER, AMOUNT_CCIPBNM);
+    }
+
+    function testTransferTokenSuccess() public {
+        ccipLocalSimulator.requestLinkFromFaucet(
+            address(amoyTokenTransfer),
+            AMOUNT_LINK_REQUEST
+        );
+
+        vm.startPrank(USER);
+        CCIPBnM.approve(address(amoyTokenTransfer), AMOUNT_CCIPBNM);
+        CCIPBnM.transfer(address(amoyTokenTransfer), AMOUNT_CCIPBNM);
+        vm.stopPrank();
+
+        amoyTokenTransfer.transferTokensPayLINK(
+            destinationChainSelector,
+            address(tokenReceiverMock),
+            address(CCIPBnM),
+            AMOUNT_CCIPBNM
+        );
+
+        assertEq(CCIPBnM.balanceOf(address(tokenReceiverMock)), AMOUNT_CCIPBNM);
+        assertEq(CCIPBnM.balanceOf(address(amoyTokenTransfer)), 0);
+        assertEq(CCIPBnM.balanceOf(USER), 0);
+    }
+}