add MessageTransferForkTest contract for testing message transfer functionality with CCIP

Author: cqlyj

test/fork/MessageTransferForkTest.t.sol

@@ -0,0 +1,96 @@
+// SPDX-License-Identifier: MIT
+pragma solidity 0.8.26;
+
+import {Test, console} from "forge-std/Test.sol";
+import {CCIPLocalSimulatorFork, Register} from "@chainlink/local/src/ccip/CCIPLocalSimulatorFork.sol";
+import {IRouterClient} from "@chainlink/contracts-ccip/src/v0.8/ccip/interfaces/IRouterClient.sol";
+import {Client} from "@chainlink/contracts-ccip/src/v0.8/ccip/libraries/Client.sol";
+import {SepoliaSender} from "src/SepoliaSender.sol";
+import {AmoyReceiver} from "src/AmoyReceiver.sol";
+
+contract MessageTransferForkTest is Test {
+    CCIPLocalSimulatorFork public ccipLocalSimulatorFork;
+    uint64 public destinationChainSelector;
+    uint256 public sourceFork;
+    uint256 public destinationFork;
+
+    IRouterClient public sourceRouter;
+    IRouterClient public destinationRouter;
+
+    SepoliaSender public sepoliaSender;
+    AmoyReceiver public amoyReceiver;
+
+    function setUp() public {
+        string memory SOURCE_RPC_URL = vm.envString("SEPOLIA_RPC_URL");
+        string memory DESTINATION_RPC_URL = vm.envString("AMOY_RPC_URL");
+        sourceFork = vm.createFork(SOURCE_RPC_URL);
+        destinationFork = vm.createSelectFork(DESTINATION_RPC_URL);
+
+        ccipLocalSimulatorFork = new CCIPLocalSimulatorFork();
+        vm.makePersistent(address(ccipLocalSimulatorFork));
+
+        vm.selectFork(sourceFork);
+        Register.NetworkDetails
+            memory sourceNetworkDetails = ccipLocalSimulatorFork
+                .getNetworkDetails(block.chainid);
+        sourceRouter = IRouterClient(sourceNetworkDetails.routerAddress);
+
+        sepoliaSender = new SepoliaSender(
+            address(sourceRouter),
+            address(sourceNetworkDetails.linkAddress)
+        );
+
+        vm.selectFork(destinationFork);
+        Register.NetworkDetails
+            memory destinationNetworkDetails = ccipLocalSimulatorFork
+                .getNetworkDetails(block.chainid);
+        destinationChainSelector = destinationNetworkDetails.chainSelector;
+        destinationRouter = IRouterClient(
+            destinationNetworkDetails.routerAddress
+        );
+
+        amoyReceiver = new AmoyReceiver(address(destinationRouter));
+    }
+
+    function testMessageTransferWithLinkTokenPaidFork() public {
+        vm.selectFork(sourceFork);
+
+        ccipLocalSimulatorFork.requestLinkFromFaucet(
+            address(sepoliaSender),
+            5 ether
+        );
+
+        bytes memory signedMessage = abi.encodePacked("Hello, Amoy!");
+
+        ///////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////
+        // Something wired here, the destinationChainSelector should be set in the setUp function and indeed set, but here it's still 0. //
+
+        vm.selectFork(destinationFork);
+        Register.NetworkDetails
+            memory destinationNetworkDetails = ccipLocalSimulatorFork
+                .getNetworkDetails(block.chainid);
+        destinationChainSelector = destinationNetworkDetails.chainSelector;
+
+        vm.selectFork(sourceFork);
+
+        ///////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////
+
+        bytes32 messageId = sepoliaSender.sendMessage(
+            destinationChainSelector,
+            address(amoyReceiver),
+            signedMessage
+        );
+
+        ccipLocalSimulatorFork.switchChainAndRouteMessage(destinationFork);
+
+        vm.selectFork(destinationFork);
+        bytes memory receivedMessage = amoyReceiver.getSignedMessage();
+        bytes32 lastMessageId = amoyReceiver.getMessageId();
+
+        string memory expectedMessage = "Hello, Amoy!";
+        string memory actualMessage = abi.decode(receivedMessage, (string));
+
+        assertEq(messageId, lastMessageId);
+        assertEq(expectedMessage, actualMessage);
+    }
+}