Add unit tests for token bridge L2 contracts

test-foundry/L2ArbitrumGateway.t.sol

@@ -0,0 +1,88 @@
+// SPDX-License-Identifier: Apache-2.0
+
+pragma solidity ^0.8.0;
+
+import "forge-std/Test.sol";
+
+import {L2ArbitrumGateway} from "contracts/tokenbridge/arbitrum/gateway/L2ArbitrumGateway.sol";
+import {ArbSysMock} from "contracts/tokenbridge/test/ArbSysMock.sol";
+import {ITokenGateway} from "contracts/tokenbridge/libraries/gateway/ITokenGateway.sol";
+
+abstract contract L2ArbitrumGatewayTest is Test {
+    L2ArbitrumGateway public l2Gateway;
+    ArbSysMock public arbSysMock = new ArbSysMock();
+
+    address public router = makeAddr("router");
+    address public l1Counterpart = makeAddr("l1Counterpart");
+
+    // token transfer params
+    address public receiver = makeAddr("to");
+    address public sender = makeAddr("from");
+    uint256 public amount = 2400;
+
+    /* solhint-disable func-name-mixedcase */
+    function test_getOutboundCalldata() public {
+        address token = makeAddr("token");
+        bytes memory data = new bytes(340);
+
+        bytes memory expected = abi.encodeWithSelector(
+            ITokenGateway.finalizeInboundTransfer.selector,
+            token,
+            sender,
+            receiver,
+            amount,
+            abi.encode(0, data)
+        );
+        bytes memory actual = l2Gateway.getOutboundCalldata(token, sender, receiver, amount, data);
+
+        assertEq(actual, expected, "Invalid outbound calldata");
+    }
+
+    function test_finalizeInboundTransfer() public virtual;
+    function test_finalizeInboundTransfer_WithCallHook() public virtual;
+
+    function test_outboundTransfer() public virtual;
+
+    function test_outboundTransfer_4Args() public virtual;
+
+    function test_outboundTransfer_revert_ExtraDataDisabled() public {
+        vm.expectRevert("EXTRA_DATA_DISABLED");
+        bytes memory extraData = new bytes(0x1234);
+        l2Gateway.outboundTransfer(address(100), address(101), 200, 0, 0, extraData);
+    }
+
+    function test_outboundTransfer_revert_NoValue() public {
+        vm.expectRevert("NO_VALUE");
+        l2Gateway.outboundTransfer{value: 1 ether}(
+            address(100), address(101), 200, 0, 0, new bytes(0)
+        );
+    }
+
+    function test_outboundTransfer_revert_NotExpectedL1Token() public virtual;
+
+    function test_outboundTransfer_revert_TokenNotDeployed() public {
+        address token = makeAddr("someToken");
+        vm.expectRevert("TOKEN_NOT_DEPLOYED");
+        l2Gateway.outboundTransfer(token, address(101), 200, 0, 0, new bytes(0));
+    }
+
+    ////
+    // Event declarations
+    ////
+    event DepositFinalized(
+        address indexed l1Token, address indexed _from, address indexed _receiver, uint256 _amount
+    );
+
+    event WithdrawalInitiated(
+        address l1Token,
+        address indexed _from,
+        address indexed _receiver,
+        uint256 indexed _l2ToL1Id,
+        uint256 _exitNum,
+        uint256 _amount
+    );
+
+    event TxToL1(
+        address indexed _from, address indexed _receiver, uint256 indexed _id, bytes _data
+    );
+}