add ParsePermit lib tests (#65)

test/PermintParsing.t.sol

@@ -0,0 +1,151 @@
+// SPDX-License-Identifier: Apache 2
+
+pragma solidity ^0.8.24;
+
+import "forge-std/Test.sol";
+
+import { BytesParsing } from "wormhole-sdk/libraries/BytesParsing.sol";
+import { PermitParsing } from "wormhole-sdk/libraries/PermitParsing.sol";
+
+contract PermitParsingTest is Test {
+  using BytesParsing for bytes;
+
+  function parsePermit(
+    bytes calldata params,
+    uint offset
+  ) external pure returns (uint256, uint256, bytes32, bytes32, uint8, uint) {
+    return PermitParsing.asPermitCdUnchecked(params, offset);
+  }
+
+  function parsePermit2Permit(
+    bytes calldata params,
+    uint offset
+  ) external pure returns (uint160, uint48, uint48, uint256, bytes memory, uint) {
+    return PermitParsing.asPermit2PermitCdUnchecked(params, offset);
+  }
+
+  function parsePermit2Transfer(
+    bytes calldata params,
+    uint offset
+  ) external pure returns (uint256, uint256, uint256, bytes memory, uint) {
+    return PermitParsing.asPermit2TransferCdUnchecked(params, offset);
+  }
+
+  function testParsePermit(
+    uint256 value, 
+    uint256 deadline, 
+    bytes32 r, 
+    bytes32 s, 
+    uint8 v
+  ) public {
+    bytes memory params = abi.encodePacked(value, deadline, r, s, v);
+
+    (
+      uint256 _value, 
+      uint256 _deadline, 
+      bytes32 _r, 
+      bytes32 _s, 
+      uint8 _v, 
+      uint offset
+    ) = PermitParsing.asPermitUnchecked(params, 0);
+    assertEq(_value, value);
+    assertEq(_deadline, deadline);
+    assertEq(_r, r);
+    assertEq(_s, s);
+    assertEq(_v, v);
+    assertEq(offset, params.length);
+
+    (
+      _value,
+      _deadline, 
+      _r, 
+      _s,
+      _v, 
+      offset
+    ) = this.parsePermit(params, 0);
+    assertEq(_value, value);
+    assertEq(_deadline, deadline);
+    assertEq(_r, r);
+    assertEq(_s, s);
+    assertEq(_v, v);
+    assertEq(offset, params.length);
+  }
+
+  function testParsePermit2Permit(
+    uint160 amount, 
+    uint48 expiration, 
+    uint48 nonce, 
+    uint256 sigDeadline, 
+    bytes memory signature
+  ) public {
+    vm.assume(signature.length == 65);
+    bytes memory params = abi.encodePacked(amount, expiration, nonce, sigDeadline, signature);
+
+    (
+      uint160 _amount, 
+      uint48 _expiration, 
+      uint48 _nonce, 
+      uint256 _sigDeadline, 
+      bytes memory _signature, 
+      uint offset
+    ) = PermitParsing.asPermit2PermitUnchecked(params, 0);
+    assertEq(_amount, amount);
+    assertEq(_expiration, expiration);
+    assertEq(_nonce, nonce);
+    assertEq(_sigDeadline, sigDeadline);
+    assertEq(_signature, signature);
+    assertEq(offset, params.length);
+
+
+    (
+      _amount,
+      _expiration,
+      _nonce,
+      _sigDeadline,
+      _signature,
+      offset
+    ) = this.parsePermit2Permit(params, 0);
+    assertEq(_amount, amount);
+    assertEq(_expiration, expiration);
+    assertEq(_nonce, nonce);
+    assertEq(_sigDeadline, sigDeadline);
+    assertEq(_signature, signature);
+    assertEq(offset, params.length);
+  }
+
+  function testParsePermit2Transfer(
+    uint256 amount, 
+    uint256 nonce, 
+    uint256 sigDeadline, 
+    bytes memory signature
+  ) public {
+    vm.assume(signature.length == 65);
+    bytes memory params = abi.encodePacked(amount, nonce, sigDeadline, signature);
+
+    (
+      uint256 _amount, 
+      uint256 _nonce, 
+      uint256 _sigDeadline, 
+      bytes memory _signature, 
+      uint offset
+    ) = PermitParsing.asPermit2TransferUnchecked(params, 0);
+    assertEq(_amount, amount);
+    assertEq(_nonce, nonce);
+    assertEq(_sigDeadline, sigDeadline);
+    assertEq(_signature, signature);
+    assertEq(offset, params.length);
+
+    (
+      _amount,
+      _nonce,
+      _sigDeadline,
+      _signature,
+      offset
+    ) = this.parsePermit2Transfer(params, 0);
+    assertEq(_amount, amount);
+    assertEq(_nonce, nonce);
+    assertEq(_sigDeadline, sigDeadline);
+    assertEq(_signature, signature);
+    assertEq(offset, params.length);
+  }
+}